Conveying Pipe Interference Fit Coupling
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Solution Overview
Problem
Conventional methods for coupling conveying pipes, such as welding or gluing, face issues with structural changes due to heat, durability problems, and leaks caused by tolerance differences and inconsistent adhesive bonds, leading to frequent failures and production interruptions.
Innovation Solution
A conveying pipe design featuring a pipe collar with an interference fit and surface roughness for an anaerobic adhesive connection, which provides a consistent and durable bond resistant to heat and pressure, using an anaerobic curing adhesive in the craters and depressions created by surface roughening, ensuring a sealed adhesive gap and preventing unwanted hardening in the heat-affected zone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If welding is used to connect pipe bundles to pipe bodies, then strong mechanical connection is achieved, but heat causes adverse structural changes in the conveying pipe material
Solution Approach 1:
The patent replaces the thermal joining process (welding) with a mechanical interference fit system. The pipe collar is designed with dimensional oversize relative to the pipe end, creating a press-fit connection that achieves strong mechanical bonding without thermal input, thereby avoiding heat-induced structural changes in the pipe material.
Solution Approach 2:
The patent changes the dimensional parameters of the pipe collar, specifically designing it with an oversize fit (interference fit) that creates mechanical engagement through friction and contact pressure. This parameter change allows the connection to achieve welding-like strength through mechanical means rather than thermal processes.
2Object-affected harmful factors
If pipe bundles are glued to the pipe end surface, then heat influence is avoided, but tolerance differences and adhesive quality inconsistencies lead to leaks and failures
Solution Approach 1:
The patent merges two connection approaches: the mechanical interference fit provides the primary structural connection, while the adhesive (arranged in craters and depressions) provides secondary bonding and sealing. This combination leverages the advantages of both methods while mitigating their individual weaknesses.
Solution Approach 2:
The patent intentionally creates a porous surface structure on the pipe end (with craters and depressions) that serves as an adhesive reservoir. This porous geometry increases the adhesive bonding area and provides mechanical interlocking, significantly improving connection reliability compared to flat-surface gluing.
3Strength
If the pipe collar wall thickness is increased to strengthen the connection, then connection strength is improved, but the pipe collar cannot be stretched to create interference fit
Solution Approach 1:
The patent applies local quality by varying the wall thickness of the pipe collar: thinner in the coupling area to enable stretching and interference fit, and thicker in other areas to maintain overall structural strength. This localized differentiation allows both interference fit capability and connection strength to be achieved.
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 achieves high durability, tightness, and resistance to pressure and vibrations, allowing for cost-effective and accurate production of conveying pipes with improved sealing properties and reduced risk of failure.
Implementation Method 1
An anaerobic curing adhesive is arranged in the coupling area between the inner surface of the pipe collar and the surface of the end of the pipe. The adhesive within the adhesive gap is always sealed off from the atmosphere because the adhesive gap is at least zero. An anaerobic curing adhesive ensures that the adhesive cures and unfolds its adhesive power, even if it has no contact with the atmosphere in the coupling area due to the interference fit.
Implementation Method 2
The inner surface of the pipe collar and/or the surface of the end of the pipe has a roughness of between 20 and 70 μm, particularly preferably between 30 and 60 μm and in particular between 40 and 50 μm, at least in certain areas in the coupling area. An abrasive treatment of the surface, for example by sanding, blasting or similar roughening processes, results in a surface that has craters and depressions.
Data Source
Figure 1
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AI summary
The invention relates to a conveying pipe (1) for transporting solids, comprising a pipe body (2), which has a pipe collar (3) connected to at least one end, the conveying pipe being characterized in that the pipe collar (3) and the pipe end are coupled to each other by means of an interference fit at least in some sections in a coupling region (9) in the longitudinal direction (10) of the pipe. In the coupling region, an anaerobically curing adhesive is optionally arranged in craters or recesses. The invention further relates to a method for producing a conveying pipe (1) for transporting solids according to one of the claims 1 to 8, comprising the following steps: providing a pipe body (2) and a pipe collar (3); roughening the pipe collar inner surface (15) and/or the pipe end outer surface (14) in the coupling region (9); cleaning the pipe collar inner surface (15) and/or the pipe end outer surface (14); pressing the pipe collar (3) onto the pipe end (1) and/or pressing the pipe end into the pipe collar (3).