A double-wall liquid-driven gas deslagging and spray dust-removing screw drill for underground coal drilling

Abstract

The application discloses a double-wall liquid-driven gas deslagging and spray dust-removing screw drill for underground coal mine 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; the high-pressure water channel is a joint assembly inner tube and an annular channel of an intermediate tube, an annular channel of a rotor and a stator, a stator water eye, an annular channel of the stator and an outer sleeve tube, and a spray head, the channel realizes that high-pressure water enters and drives the rotor, most of the high-pressure water is discharged by the annular channel of the stator and the outer sleeve tube, and a small amount of high-pressure water is sprayed by the spray head to remove dust; the high-pressure gas channel is a joint assembly inner tube, a rotor, a universal shaft assembly, and a transmission shaft assembly inner tube, the channel realizes that high-pressure gas enters and cools a drill bit by discharging slag. The application is combined with a downhole drilling measurement system and a matched drill tool to be used for directional drilling construction in a complex stratum of an underground coal mine, realizes that a high-pressure water drives a screw drill to drive a drill bit to break rocks, high-pressure gas efficiently discharges slag in drilling, and a hole bottom spray actively and efficiently removes dust.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of mine drilling, oil drilling and coal mine drilling, and relates to a double-wall liquid-driven gas deslagging and spraying dust-removing screw drill for drilling under complex stratum conditions in a coal mine in cooperation with a drilling-while-measuring system in the coal mine. BACKGROUND

[0002] The near-horizontal directional drilling technology under coal mines has been widely applied to drilling construction such as gas control, water hazard prevention and hidden disaster factor detection in coal mines due to its advantages of controllable drilling trajectory, high construction precision and large single-hole coverage, and has achieved remarkable application effects. The directional drilling technology under coal mines currently mainly includes a hydraulic directional drilling technology and a pneumatic directional drilling technology. The pneumatic directional drilling technology is mainly used for drilling in soft coal seams and has good hole-forming capacity in complex coal seams such as soft coal seams due to the use of gas deslagging and small disturbance to the hole wall. However, the output torque of the pneumatic screw drill is small, and the drilling efficiency is significantly reduced when the drill encounters coal seams with partings or roof and floor. Therefore, the pneumatic directional drilling technology is difficult to drill in rock strata with a hardness coefficient greater than 3, which restricts the popularization and application of the pneumatic directional drilling technology. In addition, the pneumatic directional drilling technology uses high-pressure gas deslagging, and the dust pollution is serious during drilling. At present, the orifice injection flow type dust removal technology is mainly used for dust removal, but the sealing of the orifice is not strict, and there is a problem of dust leakage, which affects the dust removal effect and the health of the workers. 3 BACKGROUND SUMMARY

[0003] In view of the deficiencies in the prior art, the present application aims to provide a double-wall liquid-driven gas deslagging and spraying dust-removing screw drill for drilling under coal mines, which is simple in structure, convenient to operate, used in cooperation with a drilling-while-measuring system in the coal mine, greatly improves the hole-forming rate of long-distance directional drilling construction under complex stratum conditions in the coal mine, and realizes the recycling of water and active dust removal at the bottom of the hole.

[0004] To solve the above technical problems, the present application adopts the following technical solutions:

[0005] A double-walled liquid-driven gas slag discharge spray dust removal screw drill for underground drilling in coal mines includes a connector assembly, a motor assembly, a universal joint assembly and a drive shaft assembly connected in sequence, forming a dual circulation channel through which high-pressure water and high-pressure gas can pass.

[0006] The joint assembly includes an inner tube I, a middle tube, and an outer tube I, which are sequentially arranged from the inside to the outside; the motor assembly includes a rotor, a stator, and an outer tube, which are sequentially arranged from the inside to the outside; the universal joint assembly includes a universal joint, a pressure-resistant bladder, and a single-bend outer tube; the drive shaft assembly includes an inner tube II and an outer tube II, as well as bearing assembly I and bearing assembly II located in the annular space between them; the inner tube I, rotor, universal joint, and inner tube II are sequentially connected and form a central channel to allow high-pressure gas to enter, discharge slag, and cool the drill bit; the outer tube I and the outer tube... The single-bend outer tube and outer tube II are connected in sequence, and spiral grooves for installing nozzles are provided on the outer walls of the outer sleeve and the single-bend outer tube; the intermediate tube is connected to the stator and forms an intermediate annular channel. A water eye is provided on the front side wall of the stator so that high-pressure water can enter the intermediate annular channel to drive the rotor to rotate. The high-pressure water then enters the annular channel between the stator and the outer sleeve through the water eye. A portion of the high-pressure water is discharged from this channel and collected for recycling, while another portion of the high-pressure water is sprayed out from the nozzle in the form of a spray and mixed with the compressed air and drill cuttings at this location for dust removal.

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

[0008] Specifically, in the connector assembly, the two ends of the inner tube I are a male connector and a female connector, respectively. A universal joint I is embedded in the middle of the inner tube I and a pressure-resistant bag I is wrapped around it. The pressure-resistant bag I is made of pressure-resistant sealing material and can withstand gas pressures exceeding 2MPa.

[0009] Specifically, a positioning ring is provided in the annular gap between the inner tube I and the intermediate tube, and a positioning component is provided in the annular gap between the intermediate tube and the outer tube I; the positioning ring enables the unidirectional rotation of the inner tube I and the intermediate tube, and the positioning component enables the unidirectional rotation of the intermediate tube and the outer tube I.

[0010] Specifically, the rotor is connected to the inner tube I and the universal joint at both ends by insertion and threading, respectively; the inner wall of the stator is helical, and the rotor is a hollow screw; the helical groove on the outer tube is welded to the outer wall or milled on the outer wall by integral milling to improve the slag removal capacity of the screw drill; the annular gap between the stator and the outer tube is provided with a positioning ring and a positioning component.

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

[0012] Specifically, the bending angle of the single-bend outer tube is 1.25°-2°. The spiral groove on the single-bend outer tube is welded to the outer wall or milled on the outer wall as a whole, which improves the slag removal capacity of the screw drill bit. The single-bend outer tube is equipped with a liner made of high-strength wear-resistant material, which plays a supporting role during drilling.

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

[0014] Specifically, the outer sleeve and the single-bend outer sleeve are provided with continuous right-hand spiral grooves, and nozzles are evenly spaced in the spiral grooves. The nozzles are installed in the spiral grooves by threads, and high-pressure water passes through the nozzles to form a spray for dust suppression.

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

[0016] This invention employs a dual-medium gas-liquid system, combined with a downhole measurement-while-drilling system and matching drilling tools, for directional drilling in complex formations in coal mines. It enables high-pressure water to drive the screw drill bit to break rocks, while high-pressure gas efficiently removes slag during drilling. This simultaneously leverages the advantages of the hydraulic screw drill's high torque and the minimal disturbance to the borehole wall caused by gas slag removal, thus significantly improving the drilling capability in complex formations. Furthermore, bottom-hole spraying actively removes dust, solving the problem of dust pollution from gas slag removal. Additionally, it enables the recycling of water used in directional drilling, conserving water resources.

[0017] This invention drives the rotor to rotate via high-pressure water, and then transmits the power to the drill bit to rotate and break the rock through the universal joint assembly and the drive shaft assembly. It takes advantage of the large output torque of the hydraulic screw drill bit, which can drill into rock formations with a hardness coefficient of less than 10.

[0018] In this invention, most of the high-pressure water can return through the annular channel, which facilitates centralized collection at the orifice, enabling recycling and reducing water waste.

[0019] This invention enables a small portion of high-pressure water to be sprayed out in a mist form through a nozzle for active dust removal at the bottom of the hole, thereby significantly improving the on-site dust removal effect.

[0020] This invention uses high-pressure gas to remove slag and cool the drill bit, which can take advantage of the small disturbance to the borehole wall caused by gas slag removal, thereby improving the drilling capability in complex formations and increasing the drilling success rate. Attached Figure Description

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

[0022] Fig. 2 This is a schematic diagram of the connector assembly structure of the present invention;

[0023] Fig. 3 This is a schematic diagram of the motor assembly structure of the present invention;

[0024] Fig. 4 This is a schematic diagram of the universal joint and drive shaft assembly of the present invention.

[0025] The meanings of the labels in the diagram are as follows:

[0026] 1-Connector assembly; 2-Motor assembly; 3-Universal shaft assembly; 4-Drive shaft assembly; 1-1-Inner tube I; 1-2-Intermediate tube; 1-3-Outer tube I; 1-4-Universal shaft I; 1-5-Pressure-resistant bladder I; 2-1-Rotor; 2-3-Water eye; 2-4-Stator; 2-6-Outer tube; 2-7-Spiral groove; 2-8-Nozzle; 3-1-Universal shaft; 3-2-Pressure-resistant bladder; 3-3-Single-bend outer tube; 3-4-Gasket; 4-1-Inner tube II; 4-2-Bearing assembly I; 4-3-Bearing assembly II; 4-4-Outer tube II; 4-5-Sealing assembly. Detailed Implementation

[0027] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0028] Example:

[0029] like Figs. 1 to 4 As shown, this embodiment provides a double-walled liquid-driven gas slag removal spray dust suppression screw drill for underground coal mine drilling, including a connector assembly 1, a motor assembly 2, a universal joint assembly 3, and a drive shaft assembly 4 connected in sequence, forming a dual circulation channel for high-pressure water and high-pressure gas to pass through; wherein the high-pressure water flow channel is a ring channel between the inner tube and the intermediate tube 1-2 of the connector assembly 1, a ring channel between the rotor 2-1 and the stator 2-4 of the motor assembly 2, a ring water eye 2-3 in the ring tube of the stator 2-4 of the motor assembly 2, a ring channel between the ring tube of the stator 2-4 of the motor assembly 2 and the outer tube 2-6 of the motor assembly 2, and a nozzle 2-8. This channel allows high-pressure water to enter and drive the rotor 2-1 to rotate. Afterwards, most of the high-pressure water is discharged through the ring tube of the motor assembly 2 and the ring channel between the outer tube of the motor assembly 2, and a small portion of the high-pressure water is sprayed out by the nozzle 2-8 for dust removal. The high-pressure gas flow channel consists of the inner tube of connector assembly 1, rotor 2-1 of motor assembly 2, universal joint assembly 3, and inner tube of drive shaft assembly 4. This channel enables high-pressure gas to enter and discharge slag to cool the drill bit.

[0030] The connector assembly 1 includes an inner tube I1-1, a middle tube 1-2, and an outer tube I1-3, which are sequentially arranged from the inside out; the motor assembly 2 includes a rotor 2-1, a stator 2-4, and an outer tube 2-6, which are sequentially arranged from the inside out; the universal joint assembly 3 includes a universal joint 3-1, a pressure-resistant bladder 3-2, and a single-bend outer tube 3-3; the drive shaft assembly 4 includes an inner tube II4-1 and an outer tube II4-4, as well as bearing assemblies I4-2 and II4-3 located in the annular space between them; the inner tube I1-1, rotor 2-1, universal joint 3-1, and inner tube II4-1 are sequentially connected to form a central channel to allow high-pressure gas to enter, discharge slag, and cool the drill bit; the outer tube I1-3... The outer sleeve 2-6, the single-bend outer sleeve 3-3, and the outer sleeve II 4-4 are connected in sequence, and the outer walls of the outer sleeve 2-6 and the single-bend outer sleeve 3-3 are provided with spiral grooves 2-7 for mounting nozzles 2-8; the intermediate pipe 1-2 is connected to the stator 2-4 and forms an intermediate annular channel. A water eye 2-3 is provided on the front side wall of the stator 2-4 so that high-pressure water enters the intermediate annular channel to drive the rotor 2-1 to rotate. The high-pressure water then enters the annular channel between the stator 2-4 and the outer sleeve 2-6 through the water eye 2-3. A portion of the high-pressure water is discharged from this channel and collected for recycling, while another portion 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 at this location for dust removal.

[0031] In the connector assembly 1, the inner tube I1-1 has a male connector and a female connector at both ends, and a universal joint I1-4 is embedded in the middle of the inner tube I1-1 and a pressure-resistant bladder I1-5 is installed on its outer sleeve. The pressure-resistant bladder I1-5 is made of pressure-resistant sealing material and can withstand gas pressures 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 enables the unidirectional rotation of the inner tube I1-1 and the intermediate tube 1-2, and the positioning assembly enables the unidirectional 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 connector of the inner tube I1-1.

[0033] The rotor 2-1 is connected to the inner tube I1-1 and the universal joint 3-1 at both ends by insertion and threading, respectively; the inner wall of the stator 2-4 is helical, and the rotor 2-1 is a hollow screw; the helical groove 2-7 on the outer tube 2-6 is either welded to the outer wall or milled on the outer wall as a whole, improving the slag removal capacity of the screw drill; a positioning ring and positioning assembly are provided in the annular gap between the stator 2-4 and the outer tube 2-6. A sealing ring is provided on the outer wall of the male connector at the rear end of the rotor 2-1.

[0034] The universal joint 3-1 is externally mounted with a pressure-resistant bladder 3-2. The pressure-resistant bladder 3-2 is made of pressure-resistant sealing material and can withstand gas pressures exceeding 2MPa to prevent high-pressure gas leakage.

[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, which improves the slag removal capacity of the screw drill bit. The single-bend outer tube 3-3 is equipped with a liner 3-4, which 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 a seal between the inner tube II4-1 and the outer tube II4-4 and prevent high-pressure water leakage; bearing assembly I4-2 and bearing assembly II4-3 are located in front of the sealing assembly 4-5 to achieve single-action rotation between the inner tube II4-1 and the outer tube II4-4.

[0037] The outer casing 2-6 and the single-bend outer casing 3-3 are provided with continuously right-hand spiral grooves 2-7. Spray nozzles 2-8 are evenly spaced inside the spiral grooves 2-7. The spray nozzles 2-8 are installed inside the spiral grooves 2-7 by threaded connections. High-pressure water passes through the spray nozzles 2-8 to form a spray for dust suppression.

[0038] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

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

[0040] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A double-walled liquid-driven gas slag removal and dust suppression screw drill for underground coal mine drilling, characterized in that, It includes a connector assembly (1), a motor assembly (2), a universal joint assembly (3) and a drive shaft assembly (4) connected in sequence, forming a dual circulation channel that allows high-pressure water and high-pressure gas to pass through; The connector assembly (1) includes an inner tube I (1-1), a middle tube (1-2), and an outer tube I (1-3) arranged sequentially from the inside to the outside; the motor assembly (2) includes a rotor (2-1), a stator (2-4), and an outer tube (2-6) arranged sequentially from the inside to the outside; the universal joint assembly (3) includes a universal joint (3-1), a pressure-resistant bladder (3-2), and a single-bend outer tube (3-3); the drive shaft assembly (4) includes an inner tube II (4-1) and an outer tube II (4-4), as well as bearing assembly I (4-2) and bearing assembly II (4-3) disposed in the annular space between them; the inner tube I (1-1), rotor (2-1), universal joint (3-1), and inner tube II (4-1) are connected in sequence to form a central channel to allow high-pressure gas to enter and discharge slag and cool the drill bit; the outer Pipe I (1-3), outer tube (2-6), single-bend outer tube (3-3) and outer tube II (4-4) are connected in sequence, and spiral grooves (2-7) for mounting nozzles (2-8) are provided on the outer walls of the outer tube (2-6) and the single-bend outer tube (3-3); the intermediate tube (1-2) is connected to the stator (2-4) and forms an intermediate annular channel. A water eye (2-3) is provided on the front side wall of the stator (2-4) so ​​that high-pressure water enters the intermediate annular channel to drive the rotor (2-1) to rotate. The high-pressure water then enters the annular channel between the stator (2-4) and the outer tube (2-6) through the water eye (2-3). A portion of the high-pressure water is discharged from this channel and collected for recycling, while another portion 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 at that location for dust removal.

2. The double-walled liquid-driven gas slag removal spray dust suppression screw drill for underground coal mine drilling as described in claim 1, characterized in that, In the connector assembly (1), the two ends of the inner tube I (1-1) are a male connector and a female connector, respectively. 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 wrapped around it. The pressure-resistant bag I (1-5) is made of pressure-resistant sealing material and can withstand gas pressures exceeding 2MPa.

3. The double-walled liquid-driven gas slag removal spray dust suppression screw drill for underground coal mine drilling as described in claim 1, characterized in that, A positioning ring is provided in the annular gap between the inner tube I (1-1) and the intermediate tube (1-2), and a positioning component is provided in the annular gap between the intermediate tube (1-2) and the outer tube I (1-3). The positioning ring enables the unidirectional rotation of the inner tube I (1-1) and the intermediate tube (1-2), and the positioning component enables the unidirectional rotation of the intermediate tube (1-2) and the outer tube I (1-3).

4. The double-walled liquid-driven gas slag removal spray dust suppression screw drill for underground coal mine drilling as described in claim 1, characterized in that, The rotor (2-1) is connected to the inner tube I (1-1) and the universal joint (3-1) at both ends by insertion and threading, respectively; 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 tube (2-6) is welded to the outer wall or milled on the outer wall by integral milling to improve the slag removal capacity of the screw drill; the annular gap between the stator (2-4) and the outer tube (2-6) is provided with a positioning ring and a positioning component.

5. The double-walled liquid-driven gas slag removal spray dust suppression screw drill for underground coal mine drilling as described in claim 1, characterized in that, The universal joint (3-1) is externally fitted with a pressure-resistant bladder (3-2). The pressure-resistant bladder (3-2) is made of pressure-resistant sealing material and can withstand gas pressures exceeding 2MPa to prevent high-pressure gas leakage.

6. The double-walled liquid-driven gas slag removal spray dust suppression screw drill for underground coal mine drilling as described in claim 1, characterized in that, 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 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.

7. The double-walled liquid-driven gas slag removal spray dust suppression screw drill for underground coal mine drilling as described in claim 1, 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 a seal between the inner tube II (4-1) and the outer tube II (4-4) and prevent high-pressure water leakage; bearing assembly I (4-2) and 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-walled liquid-driven gas slag removal spray dust suppression screw drill bit for underground coal mine drilling as described in claim 1, characterized in that, The outer sleeve (2-6) and the single-bend outer sleeve (3-3) are provided with continuously right-hand spiral grooves (2-7). Spray nozzles (2-8) are arranged at equal intervals in the spiral grooves (2-7). The spray nozzles (2-8) are installed in the spiral grooves (2-7) by thread. High-pressure water passes through the spray nozzles (2-8) to form a spray for dust suppression.

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