Annular water expansion type hole enlarging drill bit

Abstract

The present invention relates to an annular water expansion type hole expansion drill in the field of coal mine drilling technology, comprising a drill body, a high-pressure waterway is arranged in the drill body, a plurality of pipe seats are evenly distributed along the axial direction on the outer circumferential surface of the drill body, a circle of annular chain or annular steel cable is sleeved outside each circle of pipe seats, a first hose is penetrated in the annular chain or annular steel cable, the pipe seats are embedded in the drill body and connected with the high-pressure waterway, a plurality of pipe joints are evenly distributed along the circumferential direction on each circle of pipe seats and embedded in the drill body, a second hose is connected to each pipe joint, the end of the second hose on each circle of pipe seats away from the hose joint is connected to the first hose in the annular chain or annular steel cable arranged outside the circle of pipe seats, and a plurality of short chains or short steel cables are evenly distributed along the circumferential direction on the outer surface of the annular chain or annular steel cable. The device has a simple structure, high flexibility and reliability, convenient drilling withdrawal, high hole expansion efficiency, and low maintenance cost.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mine drilling, and in particular relates to an annular water expansion type hole enlarging 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, low work efficiency, and high inspection and maintenance costs.

[0004] Therefore, it is urgent to improve the existing reaming drill bit to improve the reliability and working efficiency of the device, facilitate drill withdrawal while ensuring efficient reaming, and reduce the inspection and maintenance cost of the device. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides an annular water-expansion reaming drill bit, comprising a drill bit body, wherein a high-pressure water channel connected to a drill rod is arranged in the drill bit body, a plurality of circles of pipe seats are evenly distributed along the axial direction on the outer circumferential surface of the drill bit body, a circle of annular chain or annular steel cable is sleeved outside each circle of the pipe seats, a first hose is penetrated in the annular chain or annular steel cable, a plurality of threaded holes penetrating the outer surface of the annular chain or annular steel cable are arranged on the first hose in the circumferential direction, the pipe seat is embedded in the drill bit body and connected to the high-pressure water channel, each circle of the pipe seat is sleeved outside the annular chain or annular steel cable, a first hose is penetrated in the annular chain or annular steel cable, a plurality of threaded holes penetrating the outer surface of the annular chain or annular steel cable are arranged on the first hose in the circumferential direction, the pipe seat is embedded in the drill bit body and connected to the high-pressure water channel, A plurality of pipe joints embedded in the drill body are evenly distributed on the circle of pipe seats along the circumferential direction, each of the pipe joints is connected to a second hose, and one end of the second hose on each circle of pipe seats away from the pipe joint is threadedly connected to a threaded hole on the first hose in an annular chain or annular steel cable arranged outside the circle of pipe seats, and a plurality of short chains or short steel cables are evenly distributed on the outer surface of the annular chain or annular steel cable along the circumferential direction, and one end of the short chain or short steel cable away from the annular chain or annular steel cable is a free end, and the first hose and the second hose are both armored metal high-pressure hoses.

[0006] Preferably, 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, the drill tip is provided with a drill blade, and the drill blade is provided with a tungsten carbide diamond composite wear-resistant layer, so as to achieve the purpose of drilling deep and expanding the hole at the same time, and further improve the hole expansion efficiency.

[0007] Preferably, the expansion radius of each circle of the 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 realizing the function of gradually expanding while drilling deeper, and is beneficial to dispersing the wear of each circle of the annular chain or annular steel cable, extending the service life of the device, and improving work efficiency.

[0008] Preferably, a diamond composite sheet is provided on the outer surface of the annular swing chain or the annular steel cable, which is beneficial to improving the wear resistance of the device, extending the service life of the device, and improving work efficiency.

[0009] Preferably, a diamond composite sheet is also provided on the outer surface of the short chain or short steel cable, which is beneficial to improving the wear resistance of the device, extending the service life of the device, and improving work efficiency.

[0010] Preferably, the annular swing chain and the short chain are both made of high-strength round-link chains for mining, which is beneficial to improving the reliability of the device and extending the service life of the device.

[0011] Preferably, a spiral material guide groove is provided on the outer circumferential surface of the drill body to facilitate timely material guiding and improve hole expansion efficiency.

[0012] Preferably, the outer surfaces of the annular swing chain, short chain, annular steel cable and short steel cable are all provided with a high-strength wear-resistant metal layer, which is beneficial to prolonging the service life of the device and reducing maintenance costs.

[0013] Preferably, the high-strength and wear-resistant metal layer is made of 27SiMn material, which has high strength and good wear resistance, and is beneficial to improving the reliability of the device.

[0014] The present invention also includes other components that enable the annular water-expansion 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.

[0015] The annular water expansion type 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, and the short chain or short steel cable swings along, so as to realize the gradual expansion type and efficient hole reaming of the borehole. A first hose is inserted into the annular chain or annular steel cable, and the expansion and extension effect of high-pressure water on the first hose is utilized to improve the hole reaming rigidity of the annular chain or annular steel cable, thereby improving the hole reaming efficiency. The pipe seat and the pipe joint are both embedded in the drill bit body, which effectively protects the pipe seat and the pipe joint, prolongs the service life of the device, and reduces the cost of overhaul and maintenance. The first hose and the second hose are both armored metal high-pressure hoses, which can improve the wear resistance of the device and ensure the reliability of the device. Since the annular chain, annular steel cable, armored metal high-pressure hose, short chain and short steel cable have a relatively high degree of freedom and are flexible in deformation, the problem of coal particles being easily stuck in the reaming arm of the existing reaming drill bit is avoided. The first hose and the second hose in the device are easy to withdraw the drill after pressure relief, thereby improving the reliability of the reaming device and the reaming efficiency of coal mine drilling, and is also beneficial to reducing the inspection and maintenance costs of the device.

[0016] The beneficial effects of the present invention are that the device has a simple structure, high flexibility and reliability, is not easy to get stuck, and improves the hole expansion stiffness of the annular chain and the annular steel cable through the expansion and contraction effect of high-pressure water, thereby achieving efficient hole expansion and facilitating drill withdrawal, thereby reducing the inspection and maintenance costs of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 yes Figure 1 A partial enlarged schematic diagram of the G structure. DETAILED DESCRIPTION

[0020] 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.

[0021] Example 1

[0022] like Figures 1-2As shown, the present invention provides an annular water expansion type reaming drill bit, comprising a drill bit body 1, wherein the drill bit body 1 is provided with a high-pressure waterway 2 connected to a drill rod, wherein a plurality of tube seats 3 are evenly distributed along the axial direction on the outer circumferential surface of the drill bit body 1, wherein each tube seat 3 is sleeved with a circle of annular chain 4, wherein a first hose 5 is penetrated in the annular chain 4, wherein a plurality of threaded holes penetrating the outer surface of the annular chain 4 are provided on the first hose 5 along the circumferential direction, wherein the tube seat 3 is embedded in the drill bit body 1 and connected to the high-pressure waterway 2 ... each tube seat 3 is sleeved with a circle of annular chain 4, wherein each tube seat 3 is sleeved with a circle of annular chain 4, wherein each tube seat 3 is sleeved with a circle of annular chain 4, wherein each tube seat 3 is sleeved with a circle of annular chain 4, wherein each tube seat 3 is sleeved with a circle of annular chain 4, wherein each tube seat 3 is sleeved with a circle of annular chain 4, wherein each tube seat 3 is sleeved with a circle of annular chain 4, wherein each tube seat 3 is sleeved with a circle of annular chain 4, wherein each tube seat 3 is sleeved with a circle of annular chain 4, wherein each tube seat 3 is sleeved with a circle of annular chain The pipe seat 3 is evenly distributed along the circumferential direction with a plurality of pipe joints embedded in the drill body 1, and each of the pipe joints is connected to a second hose 6. The end of the second hose 6 on each circle of pipe seats 3 away from the pipe joint is threadedly connected to the threaded hole on the first hose 5 in the annular chain 4 arranged outside the circle of pipe seats 3. The outer surface of the annular chain 4 is evenly distributed along the circumferential direction with a plurality of short chains 7, and the end of the short chain 7 away from the annular chain 4 is a free end. The first hose 5 and the second hose 6 are both armored metal high-pressure hoses.

[0023] The drill bit body 1 is provided with a drill tip 8 at one end and a threaded inner hole 9 for connecting a drill rod at the other end. The drill tip 8 is provided with a drill blade, and the drill blade is provided with a tungsten carbide diamond composite wear-resistant layer. The purpose of drilling deep and expanding the hole can be achieved, and the hole expansion efficiency can be further improved. The hole expansion radius of each circle of the annular chain 4 gradually increases from the drill tip 8 end of the drill bit body 1 to the threaded inner hole 9 end, which is convenient for realizing the function of drilling deep and gradually expanding, and is conducive to dispersing the wear of each circle of the annular chain 4, extending the service life of the device, and improving work efficiency. The outer surface of the annular chain 4 is provided with a diamond composite sheet 10, which is conducive to improving the wear resistance of the device, extending the service life of the device, and improving work efficiency. The annular chain 4 and the short chain 7 are both high-strength round chain for mining, which is conducive to improving the reliability of the device and extending the service life of the device. A spiral material guide groove 11 is provided on the outer circumferential surface of the drill bit body 1, which is convenient for timely material guidance and improving hole expansion efficiency. The outer surfaces of the annular chain 4 and the short chain 7 are both provided with a high-strength wear-resistant metal layer, which is conducive to extending the service life of the device and reducing maintenance costs. The material of the high-strength and wear-resistant metal layer is 27SiMn material, which has high strength and good wear resistance, and is beneficial to improving the reliability of the device.

[0024] The annular water expansion type hole reaming drill bit is driven by a drill rod when in use. When the drill rod rotates, the annular chain 4 on the drill body 1 swings under the action of inertia, and the short chain 7 swings along, realizing the gradual expansion type and efficient hole reaming of the drill hole. The first hose 5 is inserted into the annular chain 4, and the expansion and extension effect of high-pressure water on the first hose 5 is used to improve the hole reaming rigidity of the annular chain 4 and improve the hole reaming efficiency. The pipe seat 3 and the pipe joint are both embedded in the drill body 1, which effectively protects the pipe seat 3 and the pipe joint, prolongs the service life of the device, and reduces the cost of inspection and maintenance. The first hose 5 and the second hose 6 are both armored metal high-pressure hoses, which can improve the wear resistance of the device and ensure the reliability of the device. Since the annular swing chain 4, the armored metal high-pressure hose and the short chain 7 have a relatively high degree of freedom and are flexible in deformation, the problem of coal particles being easily stuck in the reaming arm of the existing reaming drill bit is avoided. The first hose 5 and the second hose 6 in the device are easy to withdraw the drill after pressure relief, thereby improving the reliability of the reaming device and the reaming efficiency of coal mine drilling, and is also beneficial to reducing the inspection and maintenance costs of the device.

[0025] 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. An annular water-expansion reaming drill bit, comprising a drill bit body, wherein the drill bit body is provided with a high-pressure water channel connected to a drill rod, characterized in that: The outer circumferential surface of the drill body is evenly distributed with multiple circles of pipe seats along the axial direction, and the outer circumferential surface of the drill body is provided with a spiral material guide groove, each circle of the pipe seat is sleeved with a circle of annular chain or annular steel cable, the outer surface of the annular chain or annular steel cable is provided with a diamond composite sheet, and the annular chain or annular steel cable is penetrated with a first hose, and the first hose is provided with a plurality of threaded holes penetrating the outer surface of the annular chain or annular steel cable along the circumferential direction, the pipe seat is embedded in the drill body and is connected to the high-pressure waterway, and each circle of the pipe seat is provided with a circle of There are multiple pipe joints evenly distributed in the drill bit body, each of which is connected to a second hose, and one end of the second hose on each circle of pipe seats away from the pipe joint is threadedly connected to a threaded hole on the first hose in an annular chain or annular steel cable arranged outside the circle of pipe seats, and the outer surface of the annular chain or annular steel cable is evenly distributed with multiple short chains or short steel cables along the circumferential direction, and one end of the short chain or short steel cable away from the annular chain or annular steel cable is a free end, and the first hose and the second hose are both armored metal high-pressure hoses.

2. The annular water expansion reaming drill bit according to claim 1, 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. The drill tip is provided with a drill blade, and the drill blade is provided with a tungsten carbide diamond composite wear-resistant layer.

3. The annular water expansion reaming drill bit according to claim 2, characterized in that: The hole expansion radius of each circle 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.

4. The annular water expansion reaming drill bit according to claim 1, characterized in that: The outer surface of the short chain or the short steel cable is also provided with a diamond composite sheet.

5. The annular water expansion reaming drill bit according to claim 4, characterized in that: The ring-shaped swing chain and the short chain are both made of high-strength round-link chains for mining.

6. The annular water expansion reaming drill bit according to claim 1, characterized in that: The outer surfaces of the annular swing chain, the short chain, the annular steel cable and the short steel cable are all provided with a high-strength wear-resistant metal layer.

7. The annular water expansion reaming drill bit according to claim 6, characterized in that: The material of the high-strength wear-resistant metal layer is 27SiMn material.

Images