Loading Tube Detonation Cord Retention Mechanism
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Solution Overview
Problem
Existing mechanisms for attaching a detonation cord to shaped charges in a loading tube are cumbersome, labor-intensive, and prone to misfires due to the detonation cord separating from the shaped charges during assembly.
Innovation Solution
A loading tube with retention cutoffs and holding elements is used to securely attach the detonation cord, allowing it to be easily connected to the shaped charges without the need for additional parts or materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a trench is formed in the outside of the loading tube for placing the detonation cord, then the detonation cord can be placed, but the detonation cord may separate from the shaped charges during assembly causing misfires
Solution Approach 1:
The retention cutoff is integrally formed with the loading tube wall, merging the retention function into the tube structure itself rather than using a separate component. This integral design ensures the retention feature is permanently attached and cannot fail due to separate component detachment.
Solution Approach 2:
The holding element acts as an intermediary mechanical feature between the detonation cord and the loading tube wall. It provides a positive engagement mechanism that physically secures the cord in place, preventing separation while maintaining ease of assembly.
2Reliability
If a retainer fitting is used to hold the detonation cord in place, then the detonation cord is secured, but the assembly process becomes cumbersome and labor-intensive
Solution Approach 1:
The retention cutoff and holding element are integrally formed with the loading tube wall, eliminating the need for separate retainer fittings. This reduces the number of parts and simplifies the assembly process while maintaining secure detonation cord attachment.
Solution Approach 2:
The loading tube structure itself provides the retention function through its integral holding element, rather than requiring an external retainer fitting. The tube serves its primary containment function while simultaneously providing detonation cord retention through its wall structure.
3Reliability
If precision holes are made into the loading tube to accommodate a retainer fitting, then the detonation cord can be secured, but the manufacturing process becomes more complex and time-consuming
Solution Approach 1:
The retention cutoff is formed as an integral part of the loading tube wall through standard extrusion or forming processes, eliminating the need for separate precision hole drilling and retainer fitting installation. The holding element is created during the primary tube manufacturing process.
Solution Approach 2:
The retention function is extracted from a separate component (retainer fitting requiring precision holes) and integrated directly into the loading tube wall structure. This eliminates the need for additional precision machining operations.
Data Source
AI summary
A loading tube is configured to receive one or more shaped charges to form a perforating gun. The loading tube includes a tubular body extending along a longitudinal axis; a cord passage formed into the tubular body; a retention cutoff formed into the tubular body and configured to receive a detonator cord; and a holding element extending into the retention cutoff and being integrally made with a wall of the tubular body, wherein the holding element is configured to hold the detonator cord into the retention cutoff. The cord passage is configured to receive the detonator cord from a bore of the tubular body and to direct the detonator cord outside the bore of the tubular body.