Telescopic Mast Force Distribution for Mobile Drilling Rig
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Solution Overview
Problem
The challenge is to design a mobile drilling rig that can efficiently transport and maneuver large, heavy structures while minimizing energy consumption and weight, addressing issues of asymmetrical compression forces and bending moments, and improving energetic efficiency during drilling operations.
Innovation Solution
The solution involves a mobile drilling rig with a telescopic mast featuring a main load carrying member that distributes compression forces symmetrically, using hoisting wire ropes and a hoist system with electric control and gear drive to maximize efficiency and reduce weight, allowing for the use of longer drill strings and easier transportation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the mast dimensions and weight are increased to handle longer drill strings, then the drilling capability is improved, but the transportation and maneuverability of the drilling rig deteriorates
Solution Approach 1:
The mast is divided into multiple telescopic sections that can be nested within each other during transportation and extended to full length during drilling operations. This segmentation allows the mast to achieve both long operational length and compact transport dimensions, resolving the contradiction between drilling capability and transportation ease.
2Reliability
If the mast structure is strengthened to counter bending moments from asymmetrical compression forces, then the structural reliability is improved, but the overall weight of the drilling rig increases
Solution Approach 1:
The patent introduces asymmetrical counterweights and balancing mechanisms that specifically counteract the bending moments caused by asymmetrical compression forces. By applying asymmetrical counter-forces, the structure can maintain reliability without requiring overall strengthening of the entire mast, thus avoiding excessive weight increase.
3Ease of operation
If hydraulic raising systems are used to move the drilling head, then the ease of operation is improved, but the energy efficiency deteriorates due to multiple energy transformations
Solution Approach 1:
The patent replaces the hydraulic raising system with a direct mechanical raising mechanism driven by electric motors. This substitution eliminates the intermediate hydraulic fluid transformation step, creating a direct electrical-to-mechanical energy conversion path that significantly improves energy efficiency while maintaining ease of operation through controlled mechanical actuation.
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
This configuration ensures symmetrical force distribution, reduces bending effects, and enhances energetic efficiency by directly converting electric energy into mechanical energy, enabling easier movement and installation of the drilling rig while minimizing energy consumption and weight.
Implementation Method 1
a main load carrying member (31) that brings said mast (3) from the closed operating configuration to the extended operating configuration and vice versa; said main load carrying member (31) being distinct from said mast (3)
Implementation Method 2
using hoisting wire ropes and a hoist system with electric control and gear drive to maximize efficiency and reduce weight
Data Source
AI summary
A mobile drilling rig (1) includes a mast (3), a drilling head (5) for sliding in use along the mast (3), and at least one hoist (4). The drilling head (5) is supported by at least two hoisting wire cables (24). The mast (3) is telescopic and includes a main load carrying member (31), for extending the telescopic mast (3), at whose end a plurality of pulleys (26) are provided, on which the hoisting wire cables (24) slide. The main load carrying member (31) is adapted to bring the mast (3) from a closed operating configuration to an extended operating configuration and vice versa. The movement of the drilling head (5), when the mast (3) is in the extended operating configuration, takes place by the hoisting wire cables (24), which are pulled and released by the at least one hoist (4).