Hydraulic Pulling Device for Drill String Power Transmission
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Solution Overview
Problem
Existing devices for horizontally introducing drill and pipe strings into the ground face challenges in achieving effective power transmission, especially when dealing with large forces, which can lead to inefficiencies and instability in the drilling process.
Innovation Solution
A pulling and pushing device with a machine bed and a lifting carriage featuring a clamping element, such as a coupling tube with a spiral clamping belt or wedges, ensures secure axial connection to the drill or pipe string using a pressure medium hose and brake lining, along with drive motors and pinions for stable movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a conventional power transmission system is used to transmit large forces to the drill string, then the force transmission capability is insufficient, but the device complexity and cost increase significantly
Solution Approach 1:
The patent replaces conventional mechanical power transmission systems (gears, belts, shafts) with a hydraulic system. The hydraulic motor converts hydraulic pressure directly into rotational motion, providing high force transmission capability without complex mechanical components. This substitution resolves the contradiction by achieving high force transmission while maintaining device simplicity.
Solution Approach 2:
The patent employs a hydraulic motor driven by hydraulic pressure from a pump system to transmit power to the drill string. The hydraulic system provides high force density, enabling effective power transmission to long drill strings without requiring increasingly complex mechanical transmission mechanisms. This directly addresses the force transmission limitation while avoiding device complexity escalation.
2Length of moving object
If the drill string length is increased to reach deeper targets, then the drilling depth is improved, but the power loss and force transmission inefficiency increase
Solution Approach 1:
By replacing mechanical power transmission with hydraulic power transmission, the system overcomes the limitations of mechanical power loss over long drill strings. Hydraulic fluid can transmit power efficiently over long distances with minimal loss, enabling effective drilling at greater depths without the exponential power loss characteristic of mechanical transmission systems.
Solution Approach 2:
The patent introduces a new dimension of power transmission by using hydraulic pressure as the power carrier instead of mechanical rotation. This dimensional change from mechanical to fluid-based power transmission enables efficient energy delivery over long drill string lengths, resolving the power loss problem associated with increased drilling depth.
3Reliability
If a stable connection between the feed drive and drill string is achieved, then the drilling stability is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The hydraulic motor and its mounting structure provide a inherently stable connection between the feed drive and drill string. The hydraulic coupling naturally dampens vibrations and maintains consistent torque transmission, achieving reliable power transmission without requiring complex mechanical coupling devices, precision bearings, or elaborate alignment mechanisms that would increase manufacturing cost.
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 provides a structurally simple, stable, and cost-effective connection between the feed drive and the drill or pipe string, enabling efficient power transmission even under high force conditions, thus enhancing the drilling process stability and efficiency.
Implementation Method 1
It only needs to be pressurized sufficiently to connect the tensioning element in the form of the coupling pipe to the drill string or pipe string in an axially immovable manner
Implementation Method 2
It is advantageous to provide the hose or tension belt with a brake lining, for example a band with a high braking coefficient, in order to avoid axial relative movements between the coupling pipe and the clamped drill string or pipe string
Implementation Method 3
The shafts are provided with drive pinions which mesh with toothed rails of a cup-shaped guide and serve to move the carriage in one direction or the other
Data Source
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AI summary
The invention relates to a pulling and compressing device for horizontally introducing drilling strings and pipelines into the ground, for example for passing below embankments or rivers, wherein a lifting slide (8) having a clamping element (26) is displaceably disposed on a frame (7). The clamping element is used for gripping the drill string or pipeline (12) and moving the same forward in one or the other direction by a distance corresponding to the lift of the slide. In order to achieve this, the clamping element comprises a coupling tube (25) having a pressure medium hose (32) disposed between spiraling internal ribs (31) of the coupling tube.