Drill Bit Unblocking via Reverse Rotation and Pneumatic Release
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Solution Overview
Problem
Drill bits often jam during percussion or rotary percussion drilling in soil or rock materials due to shifting rock layers, leading to increased time, cost, and material expenditure as the drill rods and bits get stuck in unfinished boreholes.
Innovation Solution
A method and device that apply a linear movement counter to the drilling direction and a rotational movement opposite to the drilling rotation, using a screw-like or spiral connection between the drill string and drill bit with a large inclination, to release the jammed drill bit, allowing continued drilling after unblocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the drill bit becomes blocked due to shifting rock layers, then the drilling process stops and additional time and material are required, but the drill bit cannot be easily unblocked using conventional rotary drive alone
Solution Approach 1:
The patent applies reverse rotation to unblock the drill bit. When blockage occurs, the drill string rotates in the opposite direction (counter-clockwise instead of clockwise) to loosen the jammed drill bit from the rock layers, enabling the drilling process to continue without abandoning the borehole.
Solution Approach 2:
The system dynamically switches between normal drilling mode and unblocking mode. The rotary drive can change rotation direction based on operational needs - clockwise for drilling, counter-clockwise for unblocking - allowing adaptive response to different operational states.
2Ease of operation
If compressed air is discharged to loosen material around the drill bit, then unblocking may be achieved, but the method is insufficient for firmly jammed drill bits
Solution Approach 1:
Compressed air is discharged through passage openings in the drill string to loosen material surrounding the drill bit. This pneumatic method provides a first level of unblocking capability that can handle minor jamming without requiring mechanical intervention.
Solution Approach 2:
When pneumatic unblocking is insufficient, the system employs reverse rotation mechanically. The drill string rotates in the opposite direction to firmly unblock the drill bit, providing a more reliable second stage unblocking mechanism that complements the pneumatic method.
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
Enables the drill bit to be unblocked and the drilling process to be resumed without additional material or time expenditure, ensuring the drill bit does not detach from the rod and allowing for efficient completion of the borehole.
Implementation Method 1
at least one spiral or screw-like connection being provided between the end of the drill string facing the drill bit and the drill bit, which is formed by a depression or elevation or flattened area on an adapter connected between the drill string and the drill bit and a complementary profile is formed on the drill bit
Data Source
AI summary
The invention relates to a method and a device for releasing a block on a bore-crown (1) during a boring process, especially percussion boring or rotary percussion boring, for boring holes in the ground or rock, whereby a borehole is formed by a bore-crown (1) mounted on a boring rod (2) and connected thereto and acted upon by the boring rod to generate a rotational movement and optionally a percussive movement. According to the invention, when the bore-crown (1) is blocked, preventing the continuation of the boring process and especially another rotational movement of the bore-crown (1), the bore-crown (1) is subjected to a linear movement in the opposite direction to the boring direction by means of the boring rod (2), and to a rotational movement in a direction opposing the direction of the rotational displacement during the boring process by means of a corresponding connection (7, 9) between the end of the boring rod (2) facing the bore-crown (1), and the bore-crown (1), independently of a rotary drive for carrying out the boring process. As a result the borehole can be bored in a simple manner after releasing the block on the bore-crown (1).