Hybrid Pipe With Plastic Inner Tube And Wear Ring
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Solution Overview
Problem
Conveyor pipes used for transporting solids, such as in concrete delivery pumps, face challenges in pressure resistance and abrasive wear, leading to high production costs, dead weight, and manufacturability issues.
Innovation Solution
A double-walled conveyor pipe design featuring an inner tube made of plastic material and an outer tube of metallic or fiber-reinforced composite material, with wear rings at the ends to minimize wear, coupled using a casting process that prevents material loss and uses a centrifugal casting method for production, ensuring a cohesive connection and low material costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a double-walled conveying pipe with inner and outer pipes is used, then wear resistance is improved, but device complexity increases
Solution Approach 1:
The conveying pipe combines a plastic inner pipe with high wear resistance and a metallic outer pipe for pressure resistance, creating a composite structure that leverages the advantages of different materials. The inner pipe is made of plastic material selected for minimal abrasive wear, while the outer pipe provides structural strength and pressure bearing capability.
2Weight of moving object
If the inner pipe is made of plastic material, then dead weight is reduced, but strength decreases
Solution Approach 1:
The plastic inner pipe is combined with a metallic outer pipe to create a composite structure where the plastic provides weight reduction and wear resistance, while the metallic outer pipe supplies the necessary strength and pressure resistance. This composite approach allows the inner pipe to be made of lightweight plastic without compromising overall structural integrity.
3Duration of action of stationary object
If wear rings are inserted in the pipe collar, then durability is improved, but manufacturing complexity increases
Solution Approach 1:
The wear rings are inserted into the pipe collar before the inner pipe is cast into the outer pipe. This preliminary action protects the ends of the inner pipe from abrasive wear during the casting process and during service, extending the durability of the conveying pipe while integrating seamlessly into the manufacturing sequence.
4Productivity
If centrifugal casting process is used, then manufacturing efficiency is improved, but manufacturing precision requirements increase
Solution Approach 1:
The centrifugal casting process utilizes rotational speed as a controllable parameter to achieve both high manufacturing efficiency and adequate precision. By optimizing the rotational speed during casting, the process efficiently produces the double-walled pipe structure with the inner pipe properly positioned and secured within the outer pipe, meeting the required dimensional tolerances.
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 design achieves reduced dead weight, increased longevity due to wear rings, and lower manufacturing costs while maintaining pressure resistance and minimizing abrasive wear, resulting in a cost-effective and durable hybrid pipe.
Implementation Method 1
The inner tube is cast into the outer tube using a centrifugal casting process. This can be rotary centrifugal casting or die casting.
Data Source
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AI summary
The present invention relates to a conveying pipe 1 for solid material transport, comprising a double-walled pipe body consisting of an inner pipe 3 and a metallic outer pipe 2, as well as at least one pipe collar 5 arranged at the end. The conveying pipe 1 is characterized in that the inner pipe 3 is made of a solid plastic material and a wear ring 9 is inserted in the pipe collar 5, the inner diameter Di9 of which is less than or equal to the inner diameter Di3 of the inner pipe 3.