A mining reaming drill bit

Abstract

The present invention belongs to the technical field of coal mine drilling, and specifically, relates to a mining reaming drill bit, including a drill bit body, one end of the drill bit body is provided with a drill tip, the other end is provided with a threaded inner hole for connecting a drill rod, the outer circumferential surface of the drill bit body is provided with a spiral guide groove, the drill tip is provided with a drill blade, the drill blade is provided with a tungsten carbide diamond composite wear-resistant layer, the outer circumferential surface of the drill bit body is provided with multiple circles of annular sling chains or annular steel cables at intervals along the axial direction, a swing gap is left between the annular sling chains or annular steel cables and the outer circumferential surface of the drill bit body, and the annular sling chains or annular steel cables are evenly distributed on the side away from the drill bit body. The device has a simple structure, high flexibility and reliability, is not easy to get stuck, and is convenient for withdrawing the drill while ensuring efficient reaming, which can reduce the inspection and maintenance costs of the device.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mine drilling, and in particular relates to a mining reaming drill bit. Background Art

[0002] Before coal mining, it is necessary to drill holes to extract gas. When drilling, it is necessary to drill from the rock layer to the coal seam. In order to save drilling costs and increase gas extraction efficiency, it is necessary to expand the borehole in the coal seam section while ensuring that the aperture of the rock layer drilling section remains unchanged, so as to expand the surface area of ​​the pores in the coal seam and improve the gas overflow efficiency.

[0003] Existing reaming drill bits generally ream holes through reaming arms. The connection between the reaming arms and the drill pipe is subjected to large stress impacts during the reaming process and is prone to fatigue damage. In addition, when the reaming arms are contracted, large pieces of coal particles are easily clamped between the drill pipe, resulting in incomplete contraction, affecting drill withdrawal, poor device reliability, and high inspection and maintenance costs.

[0004] Therefore, there is an urgent need for a mining reaming drill bit to improve the reliability of the device, facilitate drill withdrawal while ensuring efficient reaming, and reduce the inspection and maintenance costs of the device. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a mining reaming drill bit, including a drill body, one end of the drill body is provided with a drill tip, the other end is provided with a threaded inner hole for connecting a drill rod, the outer circumferential surface of the drill body is provided with a spiral material guide groove, the drill tip is provided with a drill blade, the drill blade is provided with a tungsten carbide diamond composite wear-resistant layer, the outer circumferential surface of the drill body is provided with a plurality of circles of annular swing chains or annular steel cables at intervals along the axial direction, a swing gap is left between the annular swing chain or the annular steel cable and the outer circumferential surface of the drill body, and diamond composite sheets are evenly distributed on the side of the annular swing chain or the annular steel cable away from the drill body.

[0006] Preferably, the hole expansion radius of the multi-turn annular chain or annular steel cable gradually increases from the drill tip of the drill bit body to the threaded inner hole end, which is convenient for gradual hole expansion along the drilling depth direction and is beneficial to extending the service life of the annular chain or annular steel cable.

[0007] Preferably, the annular chain or annular steel cable is evenly distributed with 2 to 6 flexible connectors on one side close to the drill body, and the end of the flexible connector away from the annular chain or annular steel cable is connected to the outer circumferential surface of the drill body. Through the flexible connector, when the device is not rotating, the annular chain or annular steel cable can be flexibly deformed, which is convenient for drilling in or out of the borehole. When the device rotates, the annular chain or annular steel cable is ensured to be quickly thrown away from the drill body under the action of inertia to perform hole expansion operation, and at the same time, the annular chain or annular steel cable is firmly pulled within a suitable radius to ensure that the expanded hole diameter meets the design requirements.

[0008] Preferably, the flexible connecting member is a connecting chain or a steel wire rope, which is conducive to ensuring the firmness and durability of the connection of the ring-shaped swing chain or the ring-shaped steel cable.

[0009] Preferably, the annular swing chain and the connecting chain are both made of high-strength round-ring chains for mining, which have a high degree of freedom, are not prone to jamming coal particles, and are easy to inspect and replace.

[0010] Preferably, the outer surface of the annular chain or the annular steel cable is provided with a high-strength wear-resistant metal layer to improve the wear resistance of the annular chain or the annular steel cable and extend the service life of the device.

[0011] Preferably, the high-strength and wear-resistant metal layer is made of 27SiMn material, which has high strength and good wear resistance, and is conducive to improving the reliability of the device.

[0012] The present invention also includes other components that enable the mining reaming drill bit to be used normally, all of which are conventional technical means in the field. In addition, the devices or components not limited in the present invention all adopt conventional technical means in the field.

[0013] The mining hole reaming drill bit is driven by a drill rod when in use. When the drill rod rotates, the annular chain or annular steel cable on the drill bit body swings under the action of inertia to achieve gradual expansion of the borehole. A swing gap is left between the annular chain or annular steel cable and the outer cylindrical surface of the drill bit body, which can not only ensure that the aperture of the expanded hole meets the design requirements, but also avoid the annular chain or annular steel cable from rubbing against the drill bit body for a long time during the expansion, thereby ensuring the reliability of the device. By evenly distributing diamond composite sheets on the side of the annular chain or annular steel cable away from the drill bit body, the wear resistance of the annular chain or annular steel cable is improved. Since the annular chain or annular steel cable has a high degree of freedom and flexible deformation, the problem of coal particles being stuck will not occur. While ensuring efficient expansion, it is convenient to withdraw the drill, thereby improving the reliability of the expansion device, ensuring the expansion efficiency of coal mine drilling, and also helping to reduce the inspection and maintenance costs of the device.

[0014] The beneficial effects of the present invention are that the device has a simple structure, high flexibility and reliability, is not prone to jamming, is convenient for drilling back while ensuring efficient hole expansion, and can reduce the inspection and maintenance costs of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention. DETAILED DESCRIPTION

[0017] The present invention is described clearly below in conjunction with the drawings and specific embodiments in the embodiments of the present invention. The description herein is only used to explain the present invention, but is not intended to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work, any modifications, equivalent substitutions, improvements, etc., should be included in the protection scope of the present invention.

[0018] Example 1

[0019] like Figure 1 As shown, the present invention provides a mining reaming drill bit, including a drill body 1, one end of the drill body 1 is provided with a drill tip 2, the other end is provided with a threaded inner hole 3 for connecting a drill rod, the outer circumferential surface of the drill body 1 is provided with a spiral material guide groove 4, the drill tip 2 is provided with a drill blade, the drill blade is provided with a tungsten carbide diamond composite wear-resistant layer, a plurality of ring-shaped swing chains 5 are axially spaced on the outer circumferential surface of the drill body 1, a swing gap is left between the ring-shaped swing chain 5 and the outer circumferential surface of the drill body 1, and diamond composite sheets are evenly distributed on the side of the ring-shaped swing chain 5 away from the drill body 1.

[0020] Two flexible connectors 6 are evenly distributed on one side of the annular chain 5 close to the drill body 1, and one end of the flexible connector 6 away from the annular chain 5 is connected to the outer circumferential surface of the drill body 1. Through the flexible connector 6, the annular chain 5 is deformed flexibly when the device is not rotating, which is convenient for drilling in or out of the borehole. When the device rotates, the annular chain 5 is ensured to be quickly thrown away from the drill body 1 under the action of inertia to perform hole expansion operations, and at the same time, the annular chain 5 is firmly pulled within a suitable radius to ensure that the hole expansion aperture meets the design requirements. The flexible connector 6 is a connecting chain or a wire rope, which is conducive to ensuring the firmness and durability of the connection of the annular chain 5. The annular chain 5 is made of high-strength round chain for mining, which has a high degree of freedom, is not easy to get stuck in coal particles, and is easy to repair and replace. The outer surface of the annular chain is provided with a high-strength wear-resistant metal layer made of 27SiMn material, which is used to improve the wear resistance of the annular chain or annular steel cable and extend the service life of the device.

[0021] The mining reaming drill bit is driven by a drill rod when in use. When the drill rod rotates, the annular chain 5 on the drill body 1 swings under the action of inertia to achieve gradual expansion of the borehole. A swing gap is left between the annular chain 5 and the outer cylindrical surface of the drill body 1, which can not only ensure that the aperture of the expanded hole meets the design requirements, but also avoid the annular chain 5 from rubbing against the drill body 1 for a long time during the expansion, thereby ensuring the reliability of the device. By evenly distributing diamond composite sheets on the side of the annular chain 5 away from the drill body 1, the wear resistance of the annular chain 5 is improved. Since the annular chain 5 has a high degree of freedom and flexible deformation, the problem of coal particles being stuck will not occur. While ensuring efficient expansion, it is convenient to withdraw the drill, thereby improving the reliability of the expansion device, ensuring the expansion efficiency of coal mine drilling, and also helping to reduce the inspection and maintenance costs of the device.

[0022] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A mining reaming drill bit, comprising a drill bit body, characterized in that: One end of the drill body is provided with a drill tip, and the other end is provided with a threaded inner hole for connecting a drill rod, a spiral material guide groove is provided on the outer circumferential surface of the drill body, a drill tip is provided with a drill blade, and a tungsten carbide diamond composite wear-resistant layer is provided on the drill blade, and a plurality of ring-shaped chains or ring-shaped steel cables are provided on the outer circumferential surface of the drill body at intervals along the axial direction, and a swing gap is left between the ring-shaped chains or ring-shaped steel cables and the outer circumferential surface of the drill body, and diamond composite sheets are uniformly distributed on the side of the ring-shaped chains or ring-shaped steel cables away from the drill body; The hole expansion radius of the multiple turns of the annular chain or the annular steel cable gradually increases from the drill tip of the drill body to the threaded inner hole end; The side of the annular chain or the annular steel cable close to the drill body is evenly distributed with 2 to 6 flexible connectors, and the end of the flexible connector away from the annular chain or the annular steel cable is connected to the outer circumferential surface of the drill body.

2. The mining reamer according to claim 1, characterized in that: The flexible connecting piece is a connecting chain or a steel wire rope.

3. The mining reamer according to claim 2, characterized in that: The annular swing chain and the connecting chain are both made of high-strength round-link chains for mining.

4. The mining reamer according to claim 3, characterized in that: The outer surface of the annular chain or the annular steel cable is provided with a high-strength wear-resistant metal layer.

5. The mining reamer drill bit according to claim 4, characterized in that: The material of the high-strength wear-resistant metal layer is 27SiMn material.

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