Screw Press Wearing Part Support via Soldered Joint and Positive Bond
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Solution Overview
Problem
Existing screw press technologies face challenges in securing wear shoes to screw flights with high precision, leading to undesirable stresses due to high operating forces, and existing solutions from centrifuges are not applicable as they do not account for pressing forces and friction forces specific to screw presses.
Innovation Solution
A support with a wearing part connected to the screw flight via a soldered joint and a positive bond, utilizing a projection that meshes into a recess, providing a reliable force transfer and adequate purchase, with the wearing part made of hard metal and the support designed with an enclosed perimeter recess to absorb forces effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If wear shoes are connected to screw flight by welding, then the connection can withstand high operating forces, but undesirable stresses occur and material damage may result
Solution Approach 1:
The connection is divided into two independent components: a positive bond (mechanical interlocking via projection and recess) and a substance-to-substance bond (soldered joint). This segmentation allows each bonding mechanism to perform its specialized function, avoiding the stress concentration and material incompatibility issues of welding while maintaining high connection strength.
Solution Approach 2:
The connection combines two different bonding mechanisms (mechanical positive bond and metallurgical substance-to-substance bond) into a composite connection system. This composite approach leverages the advantages of both bonding types: the positive bond provides geometric interlocking and stress distribution, while the soldered joint provides metallurgical bonding without the harmful effects of welding.
2Ease of manufacture
If wear shoes are made of different material than screw flight, then material compatibility issues arise during welding, but using similar materials limits design flexibility
Solution Approach 1:
By segmenting the connection into positive bond and substance-to-substance bond components, the invention eliminates the need for material compatibility in welding. The positive bond works with any material combination, while the soldered joint can be applied to compatible material pairs, providing both manufacturing ease and material flexibility.
Solution Approach 2:
The invention changes the bonding parameter from welding (which requires material compatibility) to a combination of mechanical interlocking and soldering. This parameter change allows independent optimization of materials for the screw flight and wear shoes based on functional requirements rather than welding compatibility constraints.
3Ease of operation
If wear shoes are secured with conventional methods, then installation is simple, but precision and reliability under high loads are insufficient
Solution Approach 1:
The connection is segmented into positive bond (providing geometric precision through projection-recess interlocking) and substance-to-substance bond (providing metallurgical attachment). This segmentation enables high precision connection while maintaining relatively simple installation procedures through standardized components.
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 ensures high-precision connection and secure fastening of wearing parts, preventing detachment and material damage, even under high loads, while allowing for accurate manufacturing and prefabrication, thus enhancing the operational reliability of screw presses.
Implementation Method 1
the support and the wearing part are connected to one another by a soldered joint in the region of the recess
Data Source
AI summary
A screw press (1) for removing liquid from a pulp suspension has a shell (2) which is provided with openings through which the liquid can pass. The shell (2) contains a rotating screw with a screw flight (4) to which wearing parts are attached. Wearing part (6) and support (7) are connected to one another in a substance-to-substance bond by a soldered joint and in a positive bond by a projection (8) located at one of the two parts and which meshes into a recess (9) in the other part.