Shank Adapter Geometry for Stress Wave and Torque Transmission
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Solution Overview
Problem
Existing shank adapters in rock drilling machines face challenges in efficiently transmitting impact pulses and torque while maintaining durability, and their mounting and replacement processes are cumbersome.
Innovation Solution
A shank adapter design featuring a coupling head and rotation portion with larger outer diameters than the middle section, allowing for efficient stress wave propagation and torque transmission, and a split bearing and flushing element structure for easy mounting and dismounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the shank adapter has uniform diameter throughout, then manufacturing is simple, but stress wave propagation efficiency is reduced
Solution Approach 1:
The shank adapter features non-uniform diameter distribution with a middle section having a smaller diameter than the coupling head and rotation portion. This local variation in geometry optimizes stress wave propagation in the middle section while maintaining structural integrity and durability in the coupling and rotation sections through their larger diameters.
2Reliability
If the coupling head and rotation portion have larger dimensions, then durability and torque transmission improve, but the overall device size increases
Solution Approach 1:
The shank adapter employs localized dimensional variations where only the coupling head and rotation portion have larger diameters for durability and torque transmission, while the middle section maintains a smaller diameter to minimize overall size. This selective dimensional approach achieves the desired mechanical properties without unnecessarily increasing the entire component volume.
3Stability of the object's composition
If the shank adapter is mounted in a fixed bearing structure, then positioning is stable, but mounting and replacement become cumbersome
Solution Approach 1:
The bearing structure is divided into a fixed bearing element and a movable shank adapter assembly. This segmentation allows the shank adapter to be easily mounted and replaced while maintaining stable positioning during operation, as the bearing element remains fixed in the rock drilling machine while the shank adapter can be independently installed and removed.
4Reliability
If the middle section diameter is reduced, then stress wave propagation improves, but structural strength may be compromised
Solution Approach 1:
The shank adapter features a middle section with reduced diameter specifically optimized for stress wave propagation, while the coupling head and rotation portion maintain larger diameters to ensure structural strength and durability. This localized dimensional variation allows the middle section to be thinner for better stress wave transmission without compromising the overall structural integrity through the reinforced ends.
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
Enhances stress wave propagation efficiency, improves durability, and facilitates quick and easy replacement of components, while allowing for versatile design choices in rock drilling machines.
Implementation Method 1
propagation of the stress waves caused by impact pulses of the impact device may be effective
Implementation Method 2
transmit impact pulses and torque from the rock drilling machine to drilling tool
Data Source
AI summary
A shank adapter, rock drilling machine and method of mounting a shank adapter of a rock drilling machine inside a slide bearing element. The shank adapter includes a coupling head and a rotation portion at its opposite ends, and a flushing portion located therebetween. Outer diameters of the coupling head and the rotation portion are both greater than outer diameters of portions of the shank adaptor located therebetween.