Rock Drill Spring Position Sleeve Extraction
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Solution Overview
Problem
Existing rock drill machines require complex moving arrangements and control valves for both forward and reverse movements, leading to unnecessary strain on the drilling equipment during extraction, as they lack spring elements to manage hammering pulses effectively.
Innovation Solution
A rock drilling machine design that simplifies movements by using a position sleeve and spring elements to facilitate one-directional operation, allowing for efficient extraction by converting hammering pulses into pulling forces, reducing strain and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a separate force is directed to move the pulling gear in both directions, then the drilling equipment can be pulled out from the hole, but the cylinder, piston and packing solutions become complicated and control valves are necessary for both positioning moves
Solution Approach 1:
The invention extracts the complex bidirectional positioning mechanism and replaces it with a simple spring element that automatically provides the necessary counterforce. The spring element is integrated into the pulling gear assembly, eliminating the need for separate cylinder and piston components for reverse movement control.
Solution Approach 2:
The spring element serves itself by automatically providing the counterforce needed for bidirectional movement without requiring external control valves or complex positioning systems. The spring naturally compresses and expands to facilitate both forward and reverse movements of the pulling gear.
2Ease of operation
If a separate force is directed to move the pulling gear in both directions, then the drilling equipment can be pulled out from the hole, but control valves are necessary for both positioning moves
Solution Approach 1:
The invention removes the control valves from the system by using a spring element that passively provides the necessary forces for bidirectional movement. The spring's mechanical properties eliminate the need for active control systems.
3Ease of operation
If hammering pulses are transmitted strongly into the drill frame during pulling out, then the drilling equipment can be extracted, but the drill frame is strained by harmful hammering
Solution Approach 1:
The spring element acts as an intermediary between the hammering piston and the drill frame. It absorbs and dampens the harmful hammering pulses, converting them into useful pulling forces that facilitate the extraction of the drilling equipment while protecting the drill frame from excessive strain.
Solution Approach 2:
The invention converts the harmful hammering pulses into beneficial pulling forces. The spring element captures the energy from the hammering impulses and transforms it into effective extraction force, simultaneously reducing the harmful impacts on the drill frame.
4Productivity
If a simple spring-arrangement is used during pulling out, then there is a strong tendency to pull-off with the impulses, but the drill is strained by harmful hammering
Solution Approach 1:
The spring element serves as a mediator that decouples the hammering piston from the drill frame during extraction operations. It allows the spring to accumulate energy from hammering impulses and release it as controlled pulling force, improving extraction efficiency while protecting the drill frame.
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
The solution enables easier and less straining extraction of the drilling equipment from the hole, reducing the risk of wedging and minimizing harmful hammering impacts, while maintaining effective drilling performance, especially when the equipment is stuck.
Implementation Method 1
there is due to the simple spring-arrangement a strong tendency to pull-off with the impulses
Implementation Method 2
energy bound to flexibility throws the drilling equipment backwards in regard to the frame
Implementation Method 3
A hammer gear, by use of which hammering pulses are generated to a piston, is arranged to hammer the drill rod rear end
Data Source
AI summary
A rock drilling machine includes a frame, and arranged inside the frame is a drill rod. A hammer gear is arranged to hammer the drill rod rear end. There is arranged around the drill rod a position sleeve and an arrangement to move position sleeve in an axial direction against hammering piston so that a counter surface of the position sleeve meets the counter surface whereby, on continuing the positioning, the drill rod is movable to the point desired. The counter surface by use of a spring element is arranged to flex in regard to the other structure of the position sleeve so that in the drilling position the sleeve is arranged to be freely backing against the front side of the drilling machine, and when in the drilling operation the positioning impact on the position sleeve against the hammering piston is removed.