Compact Power Tong Cage Plate Torque Distribution
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Solution Overview
Problem
Existing power tongs for well drilling are bulky and inefficient in distributing torque, leading to increased space, weight, and construction costs, as they directly transfer force from the ring gear to the frame, which can result in excessive stress and potential damage.
Innovation Solution
A compact power tong design where the ring gear is mounted within and supported by a rigid cage plate assembly, allowing the cage plate assembly to absorb the majority of the force, with arcuate front portions designed to flex under torque, reducing stress on the frame and enabling a narrower, more efficient construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the ring gear directly transfers force to the frame, then the structure is simpler, but the frame experiences excessive stress and the overall size increases
Solution Approach 1:
The cage plate assembly serves as an intermediary component between the ring gear and the frame. It absorbs and distributes the forces generated by the ring gear, preventing excessive stress concentration on the frame while maintaining structural integrity. The cage plate assembly includes a body with arcuate front portions that flex under torque to accommodate ring gear movement without transferring excessive loads to the frame.
2Device complexity
If the ring gear directly transfers force to the frame, then fewer components are needed, but the power tong becomes bulkier and heavier
Solution Approach 1:
The power tong is segmented into distinct functional assemblies: the frame, the cage plate assembly, and the ring gear. This segmentation allows each component to be optimized for its specific function while working together as an integrated system. The cage plate assembly acts as an intermediate structure that enables compact arrangement of components without requiring excessive frame size.
3Strength
If the cage plate assembly supports the ring gear, then torque is distributed more effectively, but the cage plate assembly becomes more complex
Solution Approach 1:
The arcuate front portions of the cage plate assembly are designed with specific geometric parameters that allow them to flex under torque. The curvature and thickness of these portions are optimized to provide sufficient flexibility for torque accommodation while maintaining structural strength. This parameter optimization enables effective torque distribution without requiring overly complex cage plate design.
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 results in a more compact, lighter, and cost-effective power tong that effectively distributes torque without exceeding the yield strength of the materials, ensuring reliable operation and reduced risk of damage during pipe rotation.
Implementation Method 1
arcuate front portions designed to flex under torque, reducing stress on the frame
Data Source
AI summary
A power tong for rotating a pipe, the power tong comprising: a frame having a pair of arcuate front portions defining a throat for receiving the pipe; a cage plate assembly mounted for rotation on the arcuate front portions about a center of rotation, the cage plate assembly having an opening that is alignable with the throat; a ring gear mounted for rotation within, and supported by, the cage plate assembly about the center of rotation, the ring gear having an opening that is alignable with the throat; the ring gear cooperating with jaws mounted on the cage plate assembly for gripping the pipe upon rotation of the ring gear.