Kelly Bar Rotary Feedthrough for Drilling Torque Transmission
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Solution Overview
Problem
Kelly bar arrangements for drilling apparatuses face challenges in transmitting torque and suspending tools while preventing the rotation of supply lines, which can lead to winding issues when fluids or energy need to be supplied.
Innovation Solution
A rotary feedthrough with a drive motor is integrated into the inner Kelly bar, allowing for active rotation of attachment sections to prevent supply line rotation, combined with a rope swivel to ensure torque transmission and fluid supply without mechanical support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a Kelly bar arrangement with rope suspension is used for torque transmission and deep operations, then the ability to reach greater working depths and transmit torque is improved, but the supply lines wind around the rope when rotating, causing operational problems
Solution Approach 1:
The rotary feedthrough is activated in advance to rotate the supply line attachment section in the opposite direction to the Kelly bar rotation, preventing the supply line from winding around the rope before winding can occur
Solution Approach 2:
The rotary feedthrough applies a counter-rotating force to the supply line attachment section, creating an anti-action that offsets the rotational movement of the Kelly bar and prevents supply line entanglement
2Adaptability or versatility
If supply lines are provided for fluid or energy supply to ground working tools, then the versatility of the drilling apparatus is improved, but the supply lines rotate and wind around the rope suspension, creating harmful effects
Solution Approach 1:
The rotary feedthrough rotates the supply line attachment section in advance in the opposite direction to prevent winding, ensuring the supply line remains untangled during rotation
Solution Approach 2:
The rotary feedthrough acts as an intermediary device between the rotating Kelly bar and the stationary supply line, allowing relative rotation to occur at the feedthrough interface while keeping the supply line connection point stationary
3Productivity
If the inner Kelly bar is suspended on a rope for vertical movement, then the rope suspension efficiency is improved, but the supply line co-rotates with the rotating inner Kelly bar, leading to winding issues
Solution Approach 1:
The rotary feedthrough is activated to rotate the supply line attachment section before the Kelly bar completes a full rotation, preventing the supply line from co-rotating and winding around the rope
Solution Approach 2:
The attachment section for the supply line is separated from the rotating Kelly bar structure through the rotary feedthrough interface, allowing the supply line to remain stationary while the Kelly bar rotates independently
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
Enables reliable torque transmission and fluid supply to ground working tools, preventing supply line winding and allowing for deeper operations with enhanced versatility.
Implementation Method 1
on the rotary feedthrough a rotary means is arranged for actively rotating the two attachment sections relative to each other
Implementation Method 2
the inner Kelly bar has a rope suspension so that the inner Kelly bar as well as the entire Kelly bar arrangement can be held and moved vertically on the rope
Implementation Method 3
on the respective external and internal sides of the individual Kelly bar elements for axially running abutment strips which permit both an axial movement and a torque transmission in the circumferential direction
Data Source
AI summary
The present application relates to a Kelly bar arrangement for a drilling apparatus and a method for working the ground with the drilling apparatus. The arrangement includes a tubular outer Kelly bar and an inner Kelly bar which is displaceably supported inside the outer Kelly bar and has a rope suspension. The drilling torque can be transmitted between the outer Kelly bar and the inner Kelly bar. At least one line is arranged on the inner Kelly bar. A rotary feedthrough with a first attachment section and a second attachment section is arranged in a lower or upper end region of the inner Kelly bar. The rotary feedthrough includes a rotary device arranged for actively rotating the two attachment sections relative to each other.