Rock Drill Protective Casing With Movable Fluid Feed-Through
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Solution Overview
Problem
Existing protective devices for rock drilling units in rock drilling rigs face challenges with fluid flow paths, safety risks from rotating parts, and noise management, particularly in surface drilling applications.
Innovation Solution
A protective casing with a movable feed through panel and rails, incorporating a closing arrangement that adjusts to the movement of the drilling unit, ensuring secure fluid flow channels and safety by preventing access to rotating parts, while also providing noise reduction features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective casing is provided around the rock drilling unit, then safety is improved by preventing access to rotating parts, but the complexity of the device increases due to the need for feed through solutions for fluid flow paths
Solution Approach 1:
The protective casing is divided into a stationary part and a movable feed through panel. The panel can be moved between a retracted position (providing full protection) and an extended position (allowing fluid flow). This segmentation allows the system to switch between safety mode and operational mode, resolving the contradiction between safety and functionality.
Solution Approach 2:
The feed through panel is made movable rather than fixed. It can dynamically change its position based on operational requirements. When the drilling unit needs fluid supply, the panel extends to create a flow path. When not in use, it retracts to maintain safety. This dynamic behavior resolves the contradiction between maintaining safety and enabling fluid flow.
2Ease of operation
If a movable feed through panel is provided for fluid flow, then ease of operation is improved, but the reliability decreases due to potential uncontrolled movement
Solution Approach 1:
The closing arrangement provides feedback control for the movable panel. When the panel moves into the feed through opening, the closing arrangement detects this movement and automatically adjusts to close the gap behind the panel. This feedback mechanism ensures the opening remains closed during operation, maintaining reliability while allowing easy panel movement for fluid flow.
Solution Approach 2:
The closing arrangement acts as an intermediary between the movable panel and the feed through opening. It mediates the relationship by automatically closing the gap created when the panel moves, ensuring that the opening remains secure without requiring direct control of the panel's movement. This intermediary mechanism maintains reliability while enabling ease of operation.
3Reliability
If the feed through opening is kept closed for safety, then protection is improved, but fluid flow capability deteriorates
Solution Approach 1:
The feed through panel dynamically changes the state of the protective casing from closed to open. When extended, it creates a controlled flow path through the otherwise closed casing. When retracted, it restores the closed protective state. This dynamic transformation resolves the contradiction between maintaining protection and enabling fluid flow.
Solution Approach 2:
The protective casing is segmented into a stationary protective part and a movable feed through panel. The panel can be independently moved to create or close the fluid flow path without compromising the overall protective structure. This segmentation allows the system to provide both protection and fluid flow capability as needed.
Data Source
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AI summary
A protective device, rock drilling unit and method. The protective device (9) comprises a longitudinal protective casing (10) and a feed through panel (14) with a flow channel (15). There is a longitudinal feed through opening (17) and the feed through panel is arranged movably to the feed through opening. The protective device further comprises a first rail (18a) and second rail (18b) mounted to longitudinal edges of the feed through opening. The feed through panel is supported between the rails. There is a closing arrangement (19) for closing free areas of the feed through opening. The closing arrangement is configured to give way to the feed through panel in response to the movements of the feed through panel.