Radially Displaceable Flushing Supply Line for Hammer Drill Wear
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Solution Overview
Problem
Existing hammer drill systems for taphole drilling machines in metallurgical vessels face issues with moderate wear at bearing points and sealing problems, leading to increased maintenance needs and reduced drilling efficiency due to fixed flushing agent supply lines that cannot adapt to wear.
Innovation Solution
A radially displaceable and non-rotating supply line component with guide strips and seals, connected to a fixing ring, allows for limited radial movement and easy replacement of seals and bearing bushes without additional disassembly, ensuring uninterrupted flushing medium supply and reducing maintenance time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed flushing agent supply line is used, then the sealing is reliable, but the bearing points wear and require frequent repairs
Solution Approach 1:
The supply line is designed to be radially displaceable relative to the drilling tool holder, allowing it to dynamically adapt to wear in the bearing points. The supply line can move radially within limits while maintaining sealing contact, eliminating the need for frequent repairs when wear occurs.
Solution Approach 2:
The supply line is divided into separable components: a supply means part and a holding part that can be detached from each other. This segmentation allows the supply line to be replaced as a modular assembly, reducing maintenance time and complexity when wear or sealing problems occur.
2Ease of repair
If the supply line is made radially displaceable, then the wear is reduced, but the sealing becomes more complex
Solution Approach 1:
The supply line incorporates flexible sealing elements that can deform to maintain contact with the drilling tool holder while allowing radial displacement. The sealing structure uses flexible materials that adapt to wear without requiring complex mechanical compensation mechanisms.
Solution Approach 2:
A bearing bush is introduced as an intermediary element between the supply line and the drilling tool holder. The bearing bush absorbs the wear and allows radial displacement, while the supply line maintains sealing contact through the bearing bush, simplifying the overall sealing structure.
3Device complexity
If the supply line is integrated in the housing, then the structure is compact, but the repair time increases
Solution Approach 1:
The supply line is designed as a separable assembly with the supply means and holding part that can be detached. This segmentation allows the supply line to be quickly removed and replaced without disassembling the entire housing structure, significantly reducing repair time while maintaining compact integration during operation.
Solution Approach 2:
The supply line is pre-assembled as a complete functional unit with the supply means and holding part connected, allowing it to be replaced as a single module. This preliminary assembly eliminates the need for complex disassembly and reassembly operations during maintenance, reducing repair time.
4Reliability
If the drilling tool holder is lengthened axially, then the flushing medium supply is improved, but the drilling length is reduced
Solution Approach 1:
Instead of lengthening the drilling tool holder axially, the solution moves the flushing medium supply in the radial direction by making the supply line radially displaceable. This dimensional change allows the flushing medium to reach the tool without increasing the axial length, preserving the drilling length.
Data Source
Figure 1
AI summary
The device has rotatable and axially displaceable drilling tool holder (1) with supply channel for rinsing medium. A feeder (4) is structured and shaped essentially in axially symmetrical manner, and holding portion (5) with rinsing medium inlet (51). The feeder and holding portion are arranged as connected component and friction bearings (41,41) are arranged on sides of feeder towards holder. The holding portion is structured to be radially displaceable within limits via bending with respect to housing and a fixing ring is connected to the housing and is fixed tangentially.