Drill for coal mining

Abstract

The application discloses a drill for coal mine drilling and relates to the technical field of drilling tools. Technical points are as follows: the drill comprises a drill bit and a drill rod connected with the drill bit, an inner thread interface end of the drill rod is internally provided with a loosening sensing assembly, and the loosening sensing assembly is located on the upper side of the inner thread part in the drill rod; an outer thread joint end of the drill bit is inserted into the inner thread interface end of the drill rod and is threadedly connected between the inner thread interface end of the drill rod; the outer thread joint end top of the drill bit is connected with the loosening sensing assembly, and the loosening sensing assembly can timely transmit relevant signals to ground workers when displacement occurs along the axial direction of the outer thread joint end. The application has the advantages that when loosening occurs in the working process of the drill bit, the loosening sensing assembly additionally arranged in the drill rod connected with the drill bit can timely feed back signals to ground workers, so that the workers can timely take measures to take out the drill bit from the well before the drill bit completely falls off, the safety of the drilling process can be improved, and the trouble of fishing out the drill bit from the bottom of the well can be avoided.

Claims

1. A drilling tool for coal mine drilling, comprising a drill bit (1) and a drill rod (2) connected thereto, characterized in that: The drill rod (2) has a loosening sensing component (3) inside its internal thread interface end, and the loosening sensing component (3) is located on the upper side of the internal thread portion inside the drill rod (2); the external thread connector end of the drill bit (1) is inserted into the internal thread interface end of the drill rod (2) and the two are threadedly connected. The top of the external threaded connector of the drill bit (1) is connected to the loosening sensing component (3), which can transmit relevant signals to the ground staff in a timely manner when the drill bit (1) is displaced along its axial direction.

2. The drilling tool for coal mine drilling according to claim 1, characterized in that: The loosening sensing component (3) includes an annular plate (31) fixedly installed inside the drill rod (2), and a protective sleeve (32) is fixedly connected to the lower side of the inner ring of the annular plate (31). The axis of the protective sleeve (32) and the axis of the drill rod (2) are collinear. A leakage detection sensor (33) is installed in the gap between the protective sleeve (32) and the inner wall of the drill rod (2). The top of the external threaded connector of the drill bit (1) is inserted into the gap between the end of the protective sleeve (32) away from the annular plate (31) and the inner wall of the drill rod (2); when the drill bit (1) is in normal use, the external threaded connector of the drill bit (1), the drill rod (2), the annular plate (31) and the protective sleeve (32) together form an independent annular closed chamber.

3. The drilling tool for coal mine drilling according to claim 2, characterized in that: The length of the portion of the external threaded connector end of the drill bit (1) inserted into the gap between the protective sleeve (32) and the drill rod (2) is less than the length of the threaded connection portion between the external threaded connector end of the drill bit (1) and the internal threaded interface end of the drill rod (2).

4. The drilling tool for coal mine drilling according to claim 3, characterized in that: The drill rod (2) is a double-walled drill rod (2), and the inner diameter of the inner tube of the drill rod (2) is the same as the inner diameter of the protective sleeve (32).

5. The drilling tool for coal mine drilling according to any one of claims 2 to 4, characterized in that: The annular plate (31) is provided with an internal thread mounting seat (4) on its lower side, which is used to install a leakage detection sensor (33).

6. The drilling tool for coal mine drilling according to claim 5, characterized in that: The external threaded end of the drill bit (1) and the outer wall of the protective sleeve (32) are connected together by a threaded connection.

7. The drilling tool for coal mine drilling according to claim 5, characterized in that: A sealing ring (5) is installed on the inner side of the top of the external threaded connector end of the drill bit (1).

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