Double-wall liquid-driven gas deslagging, spraying and dust-removing screw drilling tool for coal mine underground drilling

Abstract

The invention discloses a double-wall liquid-driven gas deslagging, spraying and dedusting screw drill for coal mine underground drilling, which comprises a joint assembly, a motor assembly, a universal shaft assembly and a transmission shaft assembly, and forms a high-pressure water and high-pressure gas double-circulation channel; a high-pressure water channel is a connector assembly inner pipe and middle pipe annular channel, a rotor and stator annular channel, a stator water hole, a stator and outer sleeve annular channel and a spray head, high-pressure water enters the high-pressure water channel and drives the rotor, most of the high-pressure water is discharged through the stator and outer sleeve annular channel, and a small part of the high-pressure water is sprayed out through the spray head to remove dust. The high-pressure gas channel is an inner pipe of the connector assembly, the rotor, the cardan shaft assembly and an inner pipe of the transmission shaft assembly, and high-pressure gas enters the high-pressure gas channel to discharge slag and cool a drill bit. The directional drilling device is combined with an underground measurement-while-drilling system and a matched drilling tool to be used for directional drilling construction of an underground complex stratum of a coal mine, high-pressure water drives a screw drilling tool to drive a drill bit to crush rocks, high-pressure gas is used for drilling efficient deslagging, and hole bottom spraying active efficient dust removal is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of mine drilling, oil drilling and coal drilling, and relates to a double-walled liquid-driven gas slag-discharging spray dust-removing screw drill tool used in conjunction with a downhole coal mine measurement while drilling system for drilling in complex strata conditions in downhole coal mines. Background Art

[0002] The near-horizontal directional drilling technology in underground coal mines has been widely used in drilling construction such as gas control, water hazard prevention and control, and detection of hidden disaster factors in underground coal mines due to its advantages such as artificially controllable drilling trajectory, high construction accuracy, and large single-hole coverage, and has achieved remarkable application results. At present, the directional drilling technology in underground coal mines mainly includes hydraulic directional drilling technology and pneumatic directional drilling technology. Pneumatic directional drilling technology is mainly used for drilling in broken and soft coal seams. Due to the use of gas for slag removal, it has the advantage of small disturbance to the hole wall and has good hole-forming ability in complex coal seam conditions such as broken and soft coal seams. However, due to the small output torque of pneumatic screw drill bits, the drilling efficiency is significantly reduced when encountering gangue or top and bottom plates in the coal seam. It is difficult to drill into rock formations with a hardness coefficient greater than 3, which restricts the promotion and application of pneumatic directional drilling technology. At the same time, pneumatic directional drilling uses high-pressure gas for slag removal, and the on-site dust pollution is serious during the drilling process. At present, the orifice-inducing jet flow dust removal technology is mainly used for dust removal, but Due to the problem of loose sealing of the hole and dust leakage, the dust removal effect on site is not ideal, which affects the health of the operators. The hydraulic directional drilling process is mainly used for drilling in rock formations with good formation integrity and harder coal seams. However, for unstable formations such as mudstone and sandy mudstone, faults, folds and other geological structure areas, when the drill encounters this area, the hole wall becomes unstable and the hole collapses seriously under the scouring effect of high-pressure water, making it difficult to drill a hole, which also restricts the promotion and application of hydraulic directional drilling technology. At the same time, the water consumption required for hydraulic directional drilling construction is large, and the general water supply requirement is not less than 20m 3 / h, the drilling water is not recycled, resulting in serious waste of water resources. This drilling process cannot be used in coal mines in areas with severe water shortages. Summary of the invention

[0003] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a double-walled liquid-driven gas slag removal spray dust removal screw drill for underground coal mine drilling. The drill has a simple structure and is easy to operate. It can be used in conjunction with an underground coal mine measurement while drilling system to greatly improve the porosity of long-distance directional drilling construction under complex stratum conditions in underground coal mines, while being able to achieve water recycling and active dust removal at the bottom of the hole.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems:

[0005] A double-wall liquid-driven gas slag removal spray dust removal screw drill for underground coal mine drilling, comprising a joint assembly, a motor assembly, a universal shaft assembly and a transmission shaft assembly connected in sequence, forming a double circulation channel for high-pressure water and high-pressure gas to pass through;

[0006] The joint assembly includes an inner tube I, an intermediate tube and an outer tube I which are sequentially sleeved from the inside to the outside; the motor assembly includes a rotor, a stator and an outer sleeve which are sequentially sleeved from the inside to the outside; the universal shaft assembly includes a universal shaft, a pressure-resistant bag and a single-bend outer tube; the transmission shaft assembly includes an inner tube II and an outer tube II and a bearing group I and a bearing group II which are arranged in the annulus between the inner tube I, the rotor, the universal shaft and the inner tube II are sequentially connected and connected to form a central channel to allow high-pressure gas to enter and discharge slag and cool the drill bit; the outer tube I and the outer sleeve , the single-bend outer tube and the outer tube II are connected in sequence, and spiral grooves for installing nozzles are provided on the outer walls of the outer casing and the single-bend outer tube; the intermediate tube is connected to the stator and connected to form an intermediate annular channel, and a water hole is provided on the front side wall of the stator to allow high-pressure water to enter the intermediate annular channel to drive the rotor to rotate, and the high-pressure water then enters the annular channel between the stator and the outer casing through the water hole. A part of the high-pressure water is discharged from the channel and collected for recycling, and the other part of the high-pressure water is sprayed out from the nozzle in the form of spray and mixed with the compressed air and drill cuttings at the location for dust removal.

[0007] The present invention also includes the following technical features:

[0008] Specifically, in the joint assembly, the two ends of the inner tube I are respectively provided with a male joint and a female joint, a universal shaft I is embedded in the middle of the inner tube I and a pressure-resistant bag I is arranged on its outer shell; the pressure-resistant bag I adopts a pressure-resistant sealing material and can withstand a gas pressure exceeding 2MPa.

[0009] Specifically, a positioning ring is provided in the annular gap between the inner tube I and the middle tube, and a positioning assembly is provided in the annular gap between the middle tube and the outer tube I; the positioning ring realizes the single-motion rotation of the inner tube I and the middle tube, and the positioning assembly realizes the single-motion rotation of the middle tube and the outer tube I.

[0010] Specifically, the two ends of the rotor are respectively plugged and threadedly connected with the inner tube I and the universal shaft; the inner wall of the stator is spiral, and the rotor is a hollow screw; the spiral groove on the outer sleeve is welded to the outer wall by welding or milled on the outer wall by integral milling, so as to improve the slag removal capacity of the screw drill; the annular gap between the stator and the outer sleeve is provided with a positioning ring and a positioning assembly.

[0011] Specifically, a pressure-resistant bag is installed outside the universal shaft. The pressure-resistant bag is made of pressure-resistant sealing material and can withstand gas pressure exceeding 2MPa to prevent leakage of high-pressure gas.

[0012] Specifically, the bending angle of the single-bend outer tube is 1.25°-2°, and the spiral groove on the single-bend outer tube is welded to the outer wall or milled on the outer wall by integral milling, so as to improve the slag removal capacity of the screw drill; a liner is provided on the single-bend outer tube, and the liner is made of high-strength and wear-resistant material to play a supporting role during the drilling process.

[0013] Specifically, a sealing assembly is provided in the annular gap between the inner tube II and the outer tube II to achieve sealing between the inner tube II and the outer tube II to prevent leakage of high-pressure water; the bearing group I and the bearing group II are located in front of the sealing assembly to achieve single-motion rotation between the inner tube II and the outer tube II.

[0014] Specifically, a continuous right-hand spiral groove is provided on the outer sleeve and the single-bend outer pipe, and nozzles are arranged at equal intervals in the spiral groove. The nozzles are installed in the spiral groove through threads, and high-pressure water passes through the nozzles to form a spray for dust reduction.

[0015] Compared with the prior art, the present invention has the following technical effects:

[0016] The present invention adopts gas-liquid dual medium, and is combined with an underground measurement while drilling system and supporting drill tools for directional drilling construction in complex strata underground in coal mines, so that high-pressure water drives the screw drill to drive the drill bit to break rocks, and high-pressure gas is used for drilling and efficient slag removal. It can simultaneously give play to the advantages of large torque of hydraulic screw drill and small disturbance and damage to the hole wall caused by gas slag removal, thereby significantly improving the drilling and hole-forming capacity in complex strata. In addition, active dust removal by spraying at the bottom of the hole solves the problem of dust pollution caused by gas slag removal. At the same time, it can realize the recycling of water used for directional drilling and save water resources.

[0017] The present invention drives the rotor to rotate through high-pressure water, and then transmits power to the drill bit through the universal shaft assembly and the transmission shaft assembly to rotate and break rocks, giving full play to the advantage of the large output torque of the hydraulic screw drill bit, and can drill into rock formations with a formation hardness coefficient of less than 10.

[0018] Most of the high-pressure water of the present invention can be returned through the annular channel, which is convenient for centralized collection at the orifice, can be recycled and reduced waste of water resources.

[0019] A small portion of high-pressure water can be sprayed out in a mist form through a nozzle to actively remove dust from the bottom of the hole, thereby significantly improving the on-site dust removal effect.

[0020] The present invention uses high-pressure gas to remove slag and cool the drill bit, which can take advantage of the small disturbance of the hole wall caused by gas removal of slag, improve the drilling capability of complex formations, and improve the drilling rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of a double-walled liquid-driven pneumatic slag removal spray dust removal screw drill for underground drilling in a coal mine according to the present invention;

[0022] Figure 2 It is a schematic diagram of the joint assembly structure of the present invention;

[0023] Figure 3 It is a schematic diagram of the motor assembly structure of the present invention;

[0024] Figure 4 It is a schematic diagram of the structure of the universal shaft and the transmission shaft assembly of the present invention.

[0025] The meaning of each number in the figure is:

[0026] 1-joint assembly; 2-motor assembly; 3-universal shaft assembly; 4-drive shaft assembly; 1-1-inner tube I; 1-2-middle tube; 1-3-outer tube I; 1-4-universal shaft I; 1-5-pressure bladder I; 2-1-rotor; 2-3-water eye; 2-4-stator; 2-6-outer sleeve; 2-7-spiral groove; 2-8-nozzle; 3-1-universal shaft; 3-2-pressure bladder; 3-3-single bend outer tube; 3-4-gasket; 4-1-inner tube II; 4-2-bearing group I; 4-3-bearing group II; 4-4-outer tube II; 4-5-sealing assembly. DETAILED DESCRIPTION

[0027] Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0028] Example:

[0029] like Figures 1 to 4 As shown, this embodiment provides a double-walled liquid-driven gas slag removal spray dust removal screw drill for underground drilling in coal mines, including a joint assembly 1, a motor assembly 2, a universal shaft assembly 3 and a transmission shaft assembly 4 connected in sequence, forming a double circulation channel for high-pressure water and high-pressure gas to pass through; wherein the high-pressure water circulation channel is the inner tube of the joint assembly 1 and the annular channel of the intermediate tube 1-2-the annular channel of the motor assembly 2 rotor 2-1 and the stator 2-4-the annular channel of the motor assembly 2 stator 2-4 annular pipe circular hole water eye 2-3-the annular pipe of the motor assembly 2 stator 2-4 and the annular channel of the motor assembly 2 outer sleeve 2-6-the nozzle 2-8, the channel enables high-pressure water to enter and drive the rotor 2-1 to rotate, and then most of the high-pressure water is discharged from the annular pipe of the motor assembly 2 and the annular channel of the outer tube of the motor assembly 2, and a small amount of high-pressure water is sprayed out by the nozzle 2-8 for dust removal. The high-pressure gas circulation channel is the inner tube of the joint assembly 1, the rotor 2-1 of the motor assembly 2, the universal joint assembly 3, and the inner tube of the transmission shaft assembly 4. This channel allows high-pressure gas to enter and discharge slag to cool the drill bit.

[0030] The joint assembly 1 includes an inner tube I1-1, an intermediate tube 1-2 and an outer tube I1-3 which are sequentially sleeved from the inside to the outside; the motor assembly 2 includes a rotor 2-1, a stator 2-4 and an outer sleeve 2-6 which are sequentially sleeved from the inside to the outside; the universal shaft assembly 3 includes a universal shaft 3-1, a pressure-resistant bag 3-2 and a single-bend outer tube 3-3; the transmission shaft assembly 4 includes an inner tube II4-1 and an outer tube II4-4 and a bearing group I4-2 and a bearing group II4-3 arranged in the annulus between the two; the inner tube I1-1, the rotor 2-1, the universal shaft 3-1 and the inner tube II4-1 are sequentially connected and connected to form a central channel to allow high-pressure gas to enter and discharge slag and cool the drill bit; the outer tube I1-3, The outer casing 2-6, the single-bend outer pipe 3-3 and the outer pipe II4-4 are connected in sequence, and a spiral groove 2-7 for installing a nozzle 2-8 is provided on the outer wall of the outer casing 2-6 and the single-bend outer pipe 3-3; the intermediate pipe 1-2 is connected to the stator 2-4 and connected to form an intermediate annular passage, and a water hole 2-3 is provided on the front side wall of the stator 2-4, so that high-pressure water enters the intermediate annular passage to drive the rotor 2-1 to rotate, and the high-pressure water then enters the annular passage between the stator 2-4 and the outer casing 2-6 through the water hole 2-3. A part of the high-pressure water is discharged from the passage and collected for recycling, and the other part of the high-pressure water is sprayed out from the nozzle 2-8 in the form of a spray and mixed with the compressed air and drill cuttings there for dust removal.

[0031] In the joint assembly 1, the two ends of the inner tube I1-1 are respectively a plug-in male joint and a female joint, a universal joint I1-4 is embedded in the middle of the inner tube I1-1 and a pressure-resistant bag I1-5 is arranged on its outer surface; the pressure-resistant bag I1-5 is made of pressure-resistant sealing material and can withstand gas pressure exceeding 2MPa.

[0032] A positioning ring is provided in the annular gap between the inner tube I1-1 and the intermediate tube 1-2, and a positioning assembly is provided in the annular gap between the intermediate tube 1-2 and the outer tube I1-3; the positioning ring realizes the single-action rotation of the inner tube I1-1 and the intermediate tube 1-2, and the positioning assembly realizes the single-action rotation of the intermediate tube 1-2 and the outer tube I1-3. A sealing ring is provided on the outer wall of the male joint of the inner tube I1-1.

[0033] The two ends of the rotor 2-1 are respectively plugged and threadedly connected with the inner tube I1-1 and the universal shaft 3-1; the inner wall of the stator 2-4 is spiral, and the rotor 2-1 is a hollow screw; the spiral groove 2-7 on the outer sleeve 2-6 is welded to the outer wall or milled on the outer wall by integral milling, so as to improve the slag removal capacity of the screw drill; the annular gap between the stator 2-4 and the outer sleeve 2-6 is provided with a positioning ring and a positioning assembly. A sealing ring is provided on the outer wall of the male joint at the rear end of the rotor 2-1.

[0034] A pressure-resistant bag 3-2 is installed outside the universal shaft 3-1. The pressure-resistant bag 3-2 is made of pressure-resistant sealing material and can withstand gas pressure exceeding 2MPa to prevent leakage of high-pressure gas.

[0035] The bending angle of the single-bend outer tube 3-3 is 1.25°-2°. The spiral groove 2-7 on the single-bend outer tube 3-3 is welded to the outer wall or milled on the outer wall by integral milling, so as to improve the slag removal capacity of the screw drill. A liner 3-4 is provided on the single-bend outer tube 3-3. The liner 3-4 is made of high-strength wear-resistant material and plays a supporting role during drilling.

[0036] A sealing assembly 4-5 is provided in the annular gap between the inner tube II4-1 and the outer tube II4-4 to achieve sealing between the inner tube II4-1 and the outer tube II4-4 to prevent leakage of high-pressure water; the bearing group I4-2 and the bearing group II4-3 are located in front of the sealing assembly 4-5 to achieve single-motion rotation between the inner tube II4-1 and the outer tube II4-4.

[0037] A continuous right-handed spiral groove 2-7 is provided on the outer sleeve 2-6 and the single-bend outer pipe 3-3. Nozzles 2-8 are arranged at equal intervals in the spiral groove 2-7. The nozzles 2-8 are installed in the spiral groove 2-7 through threads. High-pressure water passes through the nozzles 2-8 to form a spray for dust reduction.

[0038] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0039] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0040] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A double-wall liquid-driven gas deslagging spray dust removal screw drill for underground coal mine drilling. It is characterized in that It comprises a joint assembly (1), a motor assembly (2), a universal shaft assembly (3) and a transmission shaft assembly (4) which are connected in sequence, forming a double circulation channel for high-pressure water and high-pressure gas to pass through; The joint assembly (1) comprises an inner tube I (1-1), an intermediate tube (1-2) and an outer tube I (1-3) which are sequentially sleeved from the inside to the outside; the motor assembly (2) comprises a rotor (2-1), a stator (2-4) and an outer sleeve (2-6) which are sequentially sleeved from the inside to the outside; the universal shaft assembly (3) comprises a universal shaft (3-1), a pressure-resistant bag (3-2) and a single-bend outer tube (3-3); the transmission shaft assembly (4) comprises an inner tube II (4-1) and an outer tube II (4-4) and a bearing group I (4-2) and a bearing group II (4-3) which are arranged in the annulus between the inner tube I (1-1), the rotor (2-1), the universal shaft (3-1) and the inner tube II (4-1) are sequentially connected and communicated to form a central channel so that high-pressure gas can enter and discharge slag and cool the drill bit; the outer sleeve (2-6) is connected to the inner tube I (1-1), the rotor (2-1), the universal shaft (3-1) and the inner tube II (4-1) to form a central channel so that high-pressure gas can enter and discharge slag and cool the drill bit; The pipe I (1-3), the outer sleeve (2-6), the single-bend outer pipe (3-3) and the outer pipe II (4-4) are connected in sequence, and a spiral groove (2-7) for installing a nozzle (2-8) is provided on the outer wall of the outer sleeve (2-6) and the single-bend outer pipe (3-3); the intermediate pipe (1-2) is connected to the stator (2-4) and communicated to form an intermediate annular passage, and a water hole (2-3) is provided on the front side wall of the stator (2-4) so ​​that high-pressure water enters the intermediate annular passage to drive the rotor (2-1) to rotate, and the high-pressure water then enters the annular passage between the stator (2-4) and the outer sleeve (2-6) through the water hole (2-3), a part of the high-pressure water is discharged from the passage and collected to realize recycling, and the other part of the high-pressure water is sprayed out from the nozzle (2-8) in the form of spray and mixed with the compressed air and drill cuttings at the location to remove dust.

2. The double-wall liquid-driven gas deslagging spray dust removal screw drill for underground coal mine drilling according to claim 1, It is characterized in that In the joint assembly (1), the two ends of the inner tube I (1-1) are respectively a male connector and a female connector, a universal shaft I (1-4) is embedded in the middle of the inner tube I (1-1) and a pressure-resistant bag I (1-5) is arranged on its outer surface; the pressure-resistant bag I (1-5) is made of pressure-resistant sealing material and can withstand gas pressure exceeding 2MPa.

3. The double-wall liquid-driven gas deslagging spray dust removal screw drill for underground coal mine drilling according to claim 1, It is characterized in that A positioning ring is provided in the annular gap between the inner tube I (1-1) and the middle tube (1-2), and a positioning assembly is provided in the annular gap between the middle tube (1-2) and the outer tube I (1-3); the positioning ring realizes the single-action rotation of the inner tube I (1-1) and the middle tube (1-2), and the positioning assembly realizes the single-action rotation of the middle tube (1-2) and the outer tube I (1-3).

4. The double-wall liquid-driven gas deslagging spray dust removal screw drill for underground coal mine drilling according to claim 1, It is characterized in that The two ends of the rotor (2-1) are respectively plugged and threadedly connected to the inner tube I (1-1) and the universal shaft (3-1); the inner wall of the stator (2-4) is spiral, and the rotor (2-1) is a hollow screw; the spiral groove (2-7) on the outer sleeve (2-6) is welded to the outer wall by welding or milled on the outer wall by integral milling, so as to improve the slag removal capacity of the screw drill; the annular gap between the stator (2-4) and the outer sleeve (2-6) is provided with a positioning ring and a positioning component.

5. The double-wall liquid-driven gas deslagging spray dust removal screw drill for underground coal mine drilling as claimed in claim 1, It is characterized in that A pressure-resistant bag (3-2) is installed outside the universal shaft (3-1). The pressure-resistant bag (3-2) is made of pressure-resistant sealing material and can withstand a gas pressure exceeding 2 MPa, thereby preventing leakage of high-pressure gas.

6. The double-wall liquid-driven gas deslagging spray dust removal screw drill for underground coal mine drilling according to claim 1, It is characterized in that The bending angle of the single-bend outer tube (3-3) is 1.25°-2°, and the spiral groove (2-7) on the single-bend outer tube (3-3) is welded to the outer wall by welding or milled on the outer wall by integral milling, thereby improving the slag removal capacity of the screw drill; a liner (3-4) is provided on the single-bend outer tube (3-3), and the liner (3-4) is made of high-strength wear-resistant material, which plays a supporting role during the drilling process.

7. The double-wall liquid-driven gas deslagging spray dust removal screw drill for underground coal mine drilling according to claim 1, It is characterized in that A sealing assembly (4-5) is provided in the annular gap between the inner tube II (4-1) and the outer tube II (4-4) to achieve sealing between the inner tube II (4-1) and the outer tube II (4-4) to prevent leakage of high-pressure water; the bearing assembly I (4-2) and the bearing assembly II (4-3) are located in front of the sealing assembly (4-5) to achieve single-action rotation between the inner tube II (4-1) and the outer tube II (4-4).

8. The double-wall liquid-driven gas deslagging spray dust removal screw drill for underground coal mine drilling as claimed in claim 1, It is characterized in that The outer sleeve (2-6) and the single-bend outer tube (3-3) are provided with a continuous right-hand spiral groove (2-7), the nozzles (2-8) are arranged at equal intervals in the spiral groove (2-7), the nozzles (2-8) are installed in the spiral groove (2-7) through threads, and high-pressure water passes through the nozzles (2-8) to form a spray to reduce dust.

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