Coal mine borehole plug pipe drilling bit

Abstract

The utility model relates to the field of coal mining safety, disclose coal mine drilling plug pipe drilling drill bit, including plug pipe, the inside of plug pipe is provided with multiple groups of gas discharge hole, the left end threaded connection of plug pipe has drill bit, the outside of drill bit is provided with three guide grooves, the guide groove is equidistant distribution of concentric circle, the outside of drill bit is connected with coal wall of sliding, plug pipe outside is connected in the coal wall inside of sliding, single group gas discharge hole is equidistant distribution of concentric circle, multiple gas discharge hole is equidistant distribution of straight line, the cross section of drill bit is Y shape. In the utility model, after drilling is completed, the left end of plug pipe is installed into drill bit and leads plug pipe to rotate and is sent into the hole bottom of coal wall drilling, avoids the difficulty of plug pipe to go down the hole bottom due to the collapse of drilling after drilling is completed, can effectively solve the problem of low rate of coal mine large size gas drainage hole, avoids the loss caused by the collapse of hole.

Description

Technical Field

[0001] This utility model relates to the field of coal mine safety, and in particular to a drilling bit for drilling plugs in coal mine boreholes. Background Technology

[0002] In coal mining operations, the presence of methane gas is a key factor affecting mining safety. The main component of coal mine methane is methane, which is stored in coal seams and rock fissures in both free and adsorbed states. As the mining depth increases, the geological pressure on the coal seam gradually increases, making the methane occurrence state more prone to change and its release rate also increases. If methane accumulates in the underground working space, when the concentration reaches a certain threshold, it may not only cause asphyxiation of workers, but also trigger serious safety accidents such as explosions and fires when it encounters ignition sources or other triggering conditions, posing a great threat to the lives of underground personnel, mining equipment, and the order of mining operations.

[0003] To ensure the safety of coal mining, the industry generally adopts technical means to pre-extract methane gas from coal seams. Drilling methane drainage holes is one of the core implementation methods. Before coal seam mining operations, methane drainage holes of specific specifications are drilled into the target coal seam using specialized drilling equipment. Then, in conjunction with the extraction system, the methane gas in the coal seam is discharged to the surface through the drainage holes for centralized treatment. This can effectively reduce the methane concentration in the coal seam and create a safe environment for subsequent coal mining operations. This technology has become an indispensable and important part of the coal mine safety production system.

[0004] Currently, coal mine drainage drilling involves drilling rigs facing the coal face. After drilling to the specified depth, the drill rod and drill bit are completely withdrawn, and a plug is manually inserted into the borehole. However, during the insertion process, if the coal seam is too loose or there is a gas outburst, the borehole may collapse, burying the drilling equipment, causing the borehole to fail, and making it impossible to insert the plug to the bottom of the hole. This results in low borehole utilization, failing to meet gas drainage efficiency requirements, and also endangering coal mine safety. Therefore, a coal mine drilling plug-in drill bit is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above deficiencies, this utility model provides a coal mine borehole plug drilling bit, which aims to improve the problem that during the drilling process, when the coal seam is too loose or there is a gas outburst, the borehole collapses, burying the drilling equipment, causing the borehole to fail, making it impossible to send the plug to the bottom of the hole, resulting in low borehole utilization, failure to meet gas extraction efficiency, and also endangering coal mine safety.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a coal mine drilling plug drill bit, comprising a plug tube, wherein multiple sets of gas drainage holes are opened inside the plug tube, and a drill bit is threadedly connected to the left end of the plug tube.

[0007] As a further description of the above technical solution: The drill bit has three guide grooves on its outside.

[0008] As a further description of the above technical solution: The guide grooves are distributed in concentric circles at equal intervals.

[0009] As a further description of the above technical solution: The drill bit is slidably connected to the coal wall.

[0010] As a further description of the above technical solution: The plug tube is externally slidably connected to the inside of the coal wall.

[0011] As a further description of the above technical solution: The gas discharge holes in a single group are distributed in concentric circles at equal intervals.

[0012] As a further description of the above technical solution: The multiple sets of gas drainage holes are distributed in a straight line at equal intervals.

[0013] As a further description of the above technical solution: The drill bit has a Y-shaped cross-section.

[0014] This utility model has the following beneficial effects: In this invention, by inserting the left end of the plug tube into the drill bit after drilling is completed and leading the plug tube to the bottom of the coal wall borehole in a rotating manner, the problem of the plug tube being difficult to lower into the bottom of the hole due to borehole collapse after drilling is completed is avoided. This effectively solves the problem of low borehole formation rate of large-size gas drainage holes in coal mines, and avoids the losses caused by borehole collapse. Attached Figure Description

[0015] Figure 1 This is a three-dimensional schematic diagram of the coal mine borehole plug drilling bit proposed in this utility model; Figure 2 This is a schematic diagram of the structure of the coal mine borehole plug drilling bit proposed in this utility model; Figure 3 This is a schematic diagram of the guide groove structure of the coal mine borehole plug drilling bit proposed in this utility model.

[0016] Legend: 1. Plug pipe; 2. Gas drainage hole; 3. Drill bit; 4. Guide groove; 5. Coal wall. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Reference Figure 1 - Figure 3 This utility model provides an embodiment of a coal mine borehole plugging drill bit, including a plug tube 1. Multiple sets of gas drainage holes 2 are opened inside the plug tube 1. A drill bit 3 is threadedly connected to the left end of the plug tube 1. The plug tube 1 is used to push the drill bit 3 into the borehole. The gas drainage holes 2 facilitate the entry of gas into the plug tube 1 for rapid discharge. The drill bit 3 is used to pull the plug tube 1 into the borehole. Three guide grooves 4 are opened on the outside of the drill bit 3. The guide grooves 4 are used to push coal powder to the surrounding area. The guide grooves 4 are concentrically and equidistantly distributed to ensure a uniform center of gravity for the drill bit 3. A coal wall 5 is slidably connected to the outside of the drill bit 3. The plug tube 1 is slidably connected to the inside of the coal wall 5, allowing the plug tube 1 and the drill bit 3 to enter the coal wall 5 along the borehole. A single set of gas drainage holes 2 is concentrically and equidistantly distributed, while multiple sets of gas drainage holes 2 are linearly and equidistantly distributed to effectively discharge gas. The drill bit 3 has a Y-shaped cross-section, which effectively improves tunneling efficiency.

[0019] Working principle: When using this device, a hole is first drilled in the coal wall 5. After drilling, the front of the plug tube 1 is connected to the drill bit 3 by a thread. The drill bit 3 stirs the coal powder that collapses during drilling and drives the plug tube 3 into the bottom of the borehole. At this time, the gas will enter the plug tube 1 through the gas drainage hole 2 and be discharged along the plug tube 1. This drilling process not only achieves the purpose of supporting the borehole while drilling to avoid the collapse of the borehole wall, but also the plug tube 1 will remain in the borehole after being sent to the bottom of the borehole to continue to support the borehole until the gas drainage operation is completed, so as to ensure that the gas drainage process maintains a high extraction rate. It can be well applied in various loose coal and rock strata that are prone to collapse. It can also effectively solve the problem of low hole formation rate of large-size gas drainage holes in coal mines, and avoid the losses caused by borehole collapse. It solves the problem of borehole collapse failure and low hole formation rate caused by excessively loose coal seams or gas outbursts during the deep hole drilling process. This provides strong technical support for improving the coal seam gas extraction rate and ensuring coal mine safety.

[0020] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A coal mine borehole plug drilling bit, comprising a plug (1), characterized in that: The plug tube (1) has multiple sets of gas outlet holes (2) inside. The left end of the plug tube (1) is threaded with a drill bit (3). The drill bit (3) has three guide grooves (4) on its outside. The guide grooves (4) are distributed in concentric circles at equal intervals. The cross-section of the drill bit (3) is Y-shaped.

2. The coal mine borehole plug drilling bit according to claim 1, characterized in that: The drill bit (3) is externally slidably connected to a coal wall (5).

3. The coal mine borehole plug drilling bit according to claim 2, characterized in that: The plug tube (1) is externally slidably connected to the inside of the coal wall (5).

4. The coal mine borehole plug drilling bit according to claim 1, characterized in that: The gas discharge holes (2) in a single group are distributed in concentric circles at equal intervals.

5. The coal mine borehole plug drilling bit according to claim 1, characterized in that: The multiple sets of gas drainage holes (2) are distributed in a straight line at equal intervals.

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