Flexible hole-reaming drill bit

Abstract

The present invention belongs to the technical field of coal mine drilling, and specifically, relates to a flexible reaming drill bit, including a drill bit body, a high-pressure waterway is arranged in the drill bit body, the high-pressure waterway is connected to the high-pressure water source in the drill rod, a drill tip is arranged at one end of the drill bit body, a threaded inner hole for connecting the drill rod is arranged at the other end, a drill blade is arranged on the drill tip, a tungsten carbide diamond composite wear-resistant layer is arranged on the drill blade, a plurality of circles of flexible reaming components are arranged axially at intervals on the outer circumferential surface of the drill bit body, 2 to 3 hollow swing chains or steel cables are arranged on each circle of the flexible reaming components, a high-pressure hose is passed through the swing chain or steel cable, the high-pressure hose is connected to the high-pressure waterway, and a high-pressure nozzle or a plugging plate is arranged at one end of the high-pressure hose away from the drill bit body. The device has a simple structure, high flexibility, is not easy to get stuck, can improve the reliability of the reaming device, reduce the reaming cost, and ensure the reaming efficiency of coal mine drilling.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mine drilling, and in particular relates to a flexible hole-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, but the setting of the reaming arms makes the reaming effect unsatisfactory. The drill rod is driven by an electric motor with a rotation speed of 500r / min. The connection between the reaming arm and the drill rod is subjected to large stress impact during the reaming process and is prone to fatigue damage. When the reaming arm contracts, large pieces of coal particles are easily clamped between the drill rod, resulting in incomplete contraction, affecting drill withdrawal, increasing reaming costs, and failing to guarantee the construction efficiency of drilling and reaming.

[0004] Therefore, a flexible reaming drill bit is urgently needed to improve the reliability of the reaming device, reduce the reaming cost, and ensure the reaming efficiency of coal mine drilling. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a flexible reaming drill bit, including a drill bit body, a high-pressure water channel is provided in the drill bit body, the high-pressure water channel is connected to the high-pressure water source in the drill rod, a drill tip is provided at one end of the drill bit body, and a threaded inner hole for connecting the drill rod is provided at the other end, the drill tip is provided with a drill blade, and the drill blade is provided with a tungsten carbide diamond composite wear-resistant layer, a plurality of circles of flexible reaming components are axially spaced on the outer circumferential surface of the drill bit body, each circle of the flexible reaming components is provided with 2 to 3 hollow swing chains or steel cables, a high-pressure hose is passed through the swing chain or steel cable, the high-pressure hose is connected to the high-pressure water channel, and a high-pressure nozzle or a plugging plate is provided at the end of the high-pressure hose away from the drill bit body.

[0006] Preferably, the flexible hole expanding assembly is provided with three circles, and the hole expanding radius of the three circles of the flexible hole expanding assembly are 100 mm, 200 mm and 250 mm respectively. The closer the swing chain or steel cable is to the drill tip, the smaller the hole expanding radius is, which is conducive to realizing gradual hole expanding and improving the wear resistance and reliability of the device.

[0007] Preferably, the swing chain adopts a high-strength round-link chain for mining, which has a high degree of freedom, avoids the problem of coal particles getting stuck, and facilitates drill withdrawal.

[0008] Preferably, the high-pressure hose is an armored metal hose, which is beneficial to improving the reliability of the device.

[0009] Preferably, a spiral material guide groove is provided on the outer circumferential surface of the drill body to facilitate material guiding and help ensure hole expansion efficiency.

[0010] Preferably, a diamond composite sheet is provided on the outer surface of the swing chain or the steel cable, which is beneficial to improving the wear resistance of the swing chain or the steel cable, extending the service life, and improving the reliability of the device.

[0011] The present invention also includes other components that enable the flexible reaming drill 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.

[0012] The flexible hole-reaming drill bit is driven by the drill rod during use. When the drill rod rotates, the chain or steel cable on the drill bit body swings under the action of inertia to achieve gradual expansion of the borehole. When a high-pressure water source is introduced into the drill rod, the high-pressure water enters the high-pressure hose along the high-pressure waterway. The high-pressure hose expands and contracts under the drive of the high-pressure water, thereby driving the chain or steel cable to expand and contract synchronously, thereby improving the hole-reaming rigidity of the chain or steel cable, which is beneficial to improving the hole-reaming efficiency. When a high-pressure nozzle is provided at one end of the high-pressure hose away from the drill bit body, it can assist in hydraulic hole-reaming and further improve the hole-reaming efficiency. After the hole-reaming is completed, when the high-pressure hose is depressurized, the chain or steel cable has a high degree of freedom, and there will be no problem of coal particles getting stuck, so the drill can be easily withdrawn, thereby improving the reliability of the hole-reaming device, which is beneficial to reducing the hole-reaming cost and ensuring the hole-reaming efficiency of coal mine drilling.

[0013] The beneficial effects of the present invention are that the device has a simple structure, high flexibility, is not easy to get stuck, can improve the reliability of the hole expansion device, reduce the hole expansion cost, and ensure the hole expansion efficiency of coal mine drilling. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0016] Figure 2 It is a schematic diagram of the three-dimensional structure of the end of the swing chain in 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 Figures 1-2 As shown, the present invention provides a flexible hole-reaming drill bit, comprising a drill bit body 1, a high-pressure waterway 2 is provided in the drill bit body 1, the high-pressure waterway 2 is connected to the high-pressure water source in the drill rod, a drill tip 3 is provided at one end of the drill bit body 1, and a threaded inner hole for connecting the drill rod is provided at the other end, the drill tip 3 is provided with a drill blade, and the drill blade is provided with a tungsten carbide diamond composite wear-resistant layer, three circles of flexible hole-reaming components are provided axially at intervals on the outer circumferential surface of the drill bit body 1, and two hollow swing chains 4 are provided on each circle of the flexible hole-reaming components, a high-pressure hose 5 is passed through the swing chain 4, and the high-pressure hose 5 is connected to the high-pressure waterway 2, and a high-pressure nozzle 6 is provided at one end of the high-pressure hose 5 away from the drill bit body 1. The expansion radius of the three circles of flexible hole-reaming components are 100mm, 200mm and 250mm respectively, and the closer the swing chain 4 is to the drill tip 3, the smaller the expansion radius is, which is conducive to realizing gradual expansion expansion and improving the wear resistance and reliability of the device. The swing chain 4 adopts a high-strength round link chain for mining, which has a high degree of freedom, avoids the problem of coal particles being stuck, and facilitates the withdrawal of the drill. The high-pressure hose 5 adopts an armored metal hose, which is conducive to improving the reliability of the device. A spiral material guide groove 7 is provided on the outer circumferential surface of the drill body 1, which is convenient for guiding materials and is conducive to ensuring the hole expansion efficiency. A diamond composite sheet 8 is provided on the outer surface of the swing chain 4, which is conducive to improving the wear resistance of the swing chain 4, extending the service life, and improving the reliability of the device.

[0020] The flexible hole-reaming drill bit is driven by a drill rod when in use. When the drill rod rotates, the chain 4 on the drill bit body 1 swings under the action of inertia to achieve gradual expansion of the borehole. When a high-pressure water source is introduced into the drill rod, the high-pressure water enters the high-pressure hose 5 along the high-pressure water channel 2. The high-pressure hose 5 expands and contracts under the drive of the high-pressure water, thereby driving the chain 4 to expand and contract synchronously, thereby improving the hole-reaming rigidity of the chain 4, which is beneficial to improving the hole-reaming efficiency. By arranging a high-pressure nozzle 6 at one end of the high-pressure hose 5 away from the drill bit body 1, it can assist the purpose of hydraulic hole-reaming and further improve the hole-reaming efficiency. After the hole-reaming is completed, when the high-pressure hose 5 is depressurized, the chain 4 has a high degree of freedom and there will be no problem of coal particles being stuck. Therefore, the drill can be easily withdrawn, thereby improving the reliability of the hole-reaming device, which is beneficial to reducing the hole-reaming cost and ensuring the hole-reaming efficiency of coal mine drilling.

[0021] 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 flexible reaming drill bit, comprising a drill bit body, wherein a high-pressure water channel is provided in the drill bit body, and the high-pressure water channel is connected to a high-pressure water source in a drill rod, characterized in that: A spiral material guide groove is provided on the outer circumferential surface of the drill body, and a drill tip is provided at one end of the drill body, and a threaded inner hole for connecting a drill rod is provided at the other end, the drill tip is provided with a drill blade, and the drill blade is provided with a tungsten carbide diamond composite wear-resistant layer, a plurality of circles of flexible hole expansion components are provided at axial intervals on the outer circumferential surface of the drill body, and each circle of the flexible hole expansion component is provided with 2 to 3 hollow swing chains or steel cables, a high-pressure hose is passed through the swing chain or steel cable, and a diamond composite sheet is provided on the outer surface of the swing chain or steel cable, the high-pressure hose is connected to the high-pressure waterway, and a high-pressure nozzle or a plugging plate is provided at the end of the high-pressure hose away from the drill body.

2. The flexible reaming drill bit according to claim 1, characterized in that: The flexible hole expanding component is provided with three circles, and the hole expanding radius of the three circles of the flexible hole expanding component are 100mm, 200mm and 250mm respectively. The closer the swing chain or steel cable is to the drill tip, the smaller the hole expanding radius is.

3. The flexible reaming drill bit according to claim 1, characterized in that: The swing chain adopts a high-strength round-link chain for mining.

4. The flexible reaming drill bit according to claim 1, characterized in that: The high-pressure hose is an armored metal hose.

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