Sucker Rod Connection Assembly With Compressive Load Insert
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Solution Overview
Problem
The manufacturing process of sucker rods is susceptible to forging errors and heat treatment is time-consuming, leading to defects like micro-fractures, and existing adhesive-based connections fail to securely lock endpieces under compression loads, causing potential catastrophic failures.
Innovation Solution
A method involving the use of an adhesive to affix an endpiece to a rod body, combined with an insert to resist compressive loads, using annular ramped profiles and a wedge system to secure the connection under tension, and optionally incorporating a compressive insert to mitigate compressive forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional forging and heat treatment processes are used to manufacture sucker rods, then the rod ends can be formed and threaded, but the process introduces defects like micro-fractures and requires time-consuming heat treatment
Solution Approach 1:
The sucker rod is divided into two separate components: a rod body and an endpiece. The endpiece is manufactured separately without requiring forging or heat treatment, eliminating the associated defects and time consumption. These components are then assembled together to form the complete sucker rod assembly.
2Ease of manufacture
If an adhesive-based wedge system is used to connect the endpiece to the rod body, then the connection can be simplified, but the system fails to securely lock under compression loads
Solution Approach 1:
A compressive insert is introduced as an intermediary component between the endpiece and rod body. This insert specifically resists compressive loads, while the adhesive continues to handle tensile loads. The insert acts as a mediator that compensates for the adhesive's weakness in compression without compromising the overall connection simplicity.
3Strength
If the wedge system is designed to lock under tension loads, then the endpiece secures well during normal operation, but the system cannot prevent catastrophic failure under compression loads like tagging
Solution Approach 1:
Different parts of the connection system are designed with specialized qualities for different loading conditions. The adhesive provides strong bonding for tensile loads, while the compressive insert provides localized resistance against compressive loads. This local specialization ensures optimal performance under both tension and compression.
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 provides a robust connection that resists both tension and compression, reducing the risk of failure and extending the lifespan of sucker rods by preventing separation under adverse loading conditions.
Implementation Method 1
an adhesive to affix the endpiece to the rod body
Implementation Method 2
an insert configured to resist compressive loads between the endpiece and the rod end
Implementation Method 3
The recess includes wedged features so the adhesive, once cured, adheres to the sucker rod body and forms an internal wedge system with the wedged features of the recess that locks the endpiece under a tension load on the rod body
Data Source
AI summary
An assembled sucker rod includes a rod body with a rod end and an endpiece containing a receptacle at the rod end. An adhesive is set between the receptacle and rod end, and an insert is positioned through the endpiece's side, contacting the rod end, and resisting compressive loads. The endpiece has apertures for the insert, which has ends and an intermediate portion; the latter contacts the rod end compressively, while the ends contact the endpiece oppositely. The rod end may feature a hole or slot for the insert, or its distal portion may directly abut the insert.