Grab Bucket Hydraulic Pipe Reinforcement for Deep Perforations
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Solution Overview
Problem
Existing grab bucket excavators face issues due to flexible pipes having high radial resistance to fluid pressure but low axial resistance to traction, which affects their performance in deep perforations.
Innovation Solution
The design incorporates flexible pipes with an inner polymeric tube, an outer protective tube, six metallic wire reinforcement layers wound at specific angles, and additional intermediate and consolidation layers to enhance both radial resistance to fluid pressure and axial resistance to traction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the flexible pipe is made with thicker reinforcement to increase axial resistance, then the pipe can withstand higher traction forces, but the radial flexibility and ability to withstand fluid pressure is compromised
Solution Approach 1:
The pipe uses a composite material system where textile reinforcement layers and polymeric materials work together to provide both axial strength and radial flexibility. The specific arrangement of layers wound at different angles creates a structure that is strong in tension while maintaining the flexibility needed to navigate the drill string and withstand radial fluid pressure.
Solution Approach 2:
The flexible pipe is designed to dynamically adapt to the operational conditions in the drill string, allowing bending and movement while maintaining structural integrity under both axial and radial loads through its layered composite construction.
Data Source
AI summary
An excavator is provided that includes a grab bucket provided with two shovels; a lifting device for lowering and lifting the grab bucket; and a hydraulic drive device provided with at least one actuator cylinder, which is designed to move the shovels between an open position and a closed position, and is operated by a fluid under pressure supplied along a flexible pipe. The flexible pipe includes at least six reinforcement layers interposed between an inner tube and an outer tube, and is provided with a plurality of intermediate layers, each of which is interposed between two adjacent reinforcement layers so as to ensure adhesion between the reinforcement layers.