Coal mine underground hole bottom power sleeve lowering device

Abstract

The invention discloses a coal mine underground hole bottom power casing lowering device which comprises an outer pipe, a lower connector and a transmission shaft, a hole sweeping drill bit is installed on the transmission shaft, and the transmission shaft is further connected with a power mechanism. The power mechanism comprises a first power mechanism, a plurality of second power mechanisms and a third power mechanism; the first power mechanism comprises a first stator and a first rotor; the second power mechanism comprises a second stator and a second rotor; the third power mechanism comprises a third stator and three rotors; the transmission shaft is sleeved with an impact mechanism and connected with the impact mechanism. According to the coal mine underground hole bottom power casing lowering device, a hole bottom multi-stage power mechanism is adopted, liquid pressure energy is converted into mechanical energy to drive the hole sweeping drill bit to rotate, so that an irregular hole wall is repaired, a collapsed hole section penetrates through the hole sweeping drill bit, and the hole sweeping drill bit has a guiding function and can be suitable for lowering a casing in a directional drilling large-curvature hole section; torque transmission is direct, energy loss is small, and the breaking efficiency of all parts in the device is improved.

Description

Technical Field

[0001] The invention relates to the technical field of drilling equipment, and in particular to a power casing lowering device at the bottom of a coal mine hole. Background Art

[0002] Drilling is an important technical means for gas extraction, water hazard prevention and control, and geological anomaly exploration. According to the trajectory characteristics, the borehole can generally be divided into three parts: casing section, transition section, and target formation section. The casing section is located at the borehole mouth, and casing needs to be lowered to seal the hole. It is the basis for ensuring large displacement adjustment of the borehole trajectory, high-pressure water-containing bodies and gas control, and broken formation protection. The casing should be lowered in place according to the design specifications and dimensions. The casing passing capacity, casing section trajectory deflection control, and near-horizontal drilling slag removal effect are the key factors affecting the lowering of the casing. Coal mining area drilling technology and equipment mainly focus on the research of drilling technology for transition sections and target formation sections, lacking research on casing lowering equipment and supporting process technology, and the casing section is still mainly constructed using conventional rotary drilling technology, which has problems such as easy deviation of the drilling trajectory, difficulty in near-horizontal slag removal, low drilling efficiency, and frequent accidents, which seriously affects the success rate of casing lowering.

[0003] At present, the casing lowering construction in coal mines adopts manual connection at the hole mouth and the casing is lowered by the top push of the drilling rig, and there is no guide head at the front end of the casing. As a result, the casing cannot be lowered to the target depth during the lowering process due to deformation of the borehole wall, local unstable formation collapse, accumulation of drill slag in the hole, and excessive curvature of the directional drilling trajectory, thus causing the casing to lose its original function. The method of manually adding and lowering the casing by the drilling rig has many problems such as low success rate of lowering, low efficiency of lowering, and low safety factor of personnel climbing operations. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a device and method for lowering a powered casing at the bottom of a coal mine hole, so as to solve the problems that the prior art means easily lead to the casing being unable to be lowered to the target depth, the lowering efficiency being low, and the safety factor of personnel climbing operations being low.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems: a power casing lowering device for the bottom of a coal mine hole, comprising an outer tube and a lower joint installed at one end of the outer tube, wherein the lower joint is a hollow structure and one end extends into the outer tube, and further comprises a transmission shaft passing through the lower joint, and a hole-sweeping drill bit is installed at one end of the transmission shaft which faces away from the outer tube and passes through the lower joint.

[0006] The end of the transmission shaft facing the outer tube and passing through the lower joint is also connected to the power mechanism.

[0007] The power mechanism comprises a first power mechanism, a plurality of second power mechanisms and a third power mechanism which are coaxially installed in the outer tube.

[0008] The first power mechanism includes a first stator and a first rotor sleeved in the first stator.

[0009] The first stator comprises a stator outer shell and a stator inner shell which are coaxially sleeved, the length of the stator inner shell is shorter than that of the stator outer shell and one end of the stator inner shell is flush with the stator inner shell.

[0010] A second spiral blade is installed between the stator outer shell and the stator inner shell. The stator outer shell and the stator inner shell are both hollow cylindrical, and the center of the stator inner shell forms a fourth central through hole.

[0011] The first rotor comprises a rotor center tube and a blade mounting tube installed at one end of the rotor center tube, the outer side of the blade mounting tube is installed with a first spiral blade, and the centers of the rotor center tube and the blade mounting tube form a third center through hole.

[0012] The rotor center tube is inserted into the fourth center through hole.

[0013] The inner surface of one end of the rotor center tube on which the first spiral blade is installed is provided with a spline groove, and the side of the rotor center tube facing away from the spline groove is connected to the transmission shaft.

[0014] The second power mechanism comprises a second stator and a second rotor sleeved in the second stator.

[0015] The second stator structure is the same as the first stator, and the second rotor structure is the same as the first rotor. The difference is that a spline is provided at one end of the rotor center tube facing away from the rotor spiral blades, and the adjacent second rotors are connected to each other, and the second rotor is connected to the first rotor.

[0016] The third power mechanism comprises a third stator and a third rotor sleeved in the third stator.

[0017] The third stator structure is the same as the first stator, and the third rotor structure is the same as the first rotor. The difference is that a spline is provided at one end of the rotor center tube facing away from the first spiral blade, and an internal thread section is provided at the other end of the rotor center tube. The end of the third rotor with the spline is connected to the second rotor.

[0018] The outer tube is provided with a fixing ring at the other end of one end of the lower joint, the fixing ring is a hollow structure, the other end of the third rotor is connected to the upper plug, and the upper plug is passed through the fixing ring.

[0019] An impact mechanism is sleeved on the transmission shaft.

[0020] The present invention also has the following technical features:

[0021] The transmission shaft comprises a drill bit joint, an annular boss, a main shaft and a rotor joint which are coaxially connected in sequence.

[0022] The drill bit joint is in the shape of a hollow cylinder, with a thread formed on the outer surface thereof, and is connected with the hole sweeping drill bit.

[0023] The annular boss is in the shape of a hollow cylinder with a diameter larger than that of the drill bit joint, and the outer side surface contacts the inner wall of the lower joint.

[0024] The spindle is in the shape of a hollow cylinder with one end open, the inner cavity is connected with the inner cavity of the drill bit joint, the diameter of the spindle is smaller than the annular boss, and a thread is provided on the outer surface of the spindle facing away from the annular boss.

[0025] The rotor joint is in the shape of a solid cylinder with a diameter smaller than that of the main shaft, with threads formed on the outer side, and is connected to the rotor center tube of the first rotor.

[0026] A water inlet hole is provided on the main shaft, and the water inlet hole is connected with the inside and outside of the transmission shaft.

[0027] A sealing groove is provided on the outer side surface of the annular boss, and a sealing ring is installed in the sealing groove.

[0028] A sealing groove is provided on the outer side surface between the thread and the annular boss, and a sealing ring is installed in the sealing groove.

[0029] The main shaft is also sleeved with a first bearing, and the outer ring of the first bearing is in contact with the inner wall of the lower joint.

[0030] The impact mechanism comprises an anvil and a hammer.

[0031] The anvil comprises a circular anvil base plate and a plurality of ascending inclined surfaces installed on one side of the anvil base plate. The center of the anvil base plate forms a first central through hole. The spindle is inserted into the first central through hole and connected to the first central through hole through threads.

[0032] The hammer comprises a circular hammer body, an annular boss installed on one side of the hammer body and a plurality of impact teeth installed on the other side of the hammer body. The center of the hammer body forms a second central through hole. The hammer body is sleeved on the outside of the main shaft and is not connected to the main shaft.

[0033] A spring is also installed inside the annular boss, and the other end of the spring is placed on a spring seat. The spring seat is sleeved outside the rotor center tube of the first rotor and connected to the end surface of the first stator. The spring is sleeved outside the main shaft and the rotor joint.

[0034] The impact teeth are matched with the rising inclined surfaces and the number of the impact teeth is the same as the number of the rising inclined surfaces.

[0035] A rectangular boss is also arranged on the outer periphery of the stator shell, and the rectangular boss cooperates with a rectangular groove opened on the inner wall of the outer tube.

[0036] A retaining spring groove is also provided on the inner wall of the outer tube, a retaining spring is installed in the retaining spring groove, and the retaining spring is used to limit the position of the third stator.

[0037] The fixing ring comprises a disc-shaped fixing ring body, a center hole arranged at the center of the fixing ring body and a plurality of water guide holes arranged along the circumference of the fixing ring body.

[0038] The upper plug includes a spherical water guide, a tooling groove and a plug joint which are connected in sequence. The plug joint is connected to the third rotor, and the spherical water guide is located and installed in the center hole.

[0039] Thrust bearings are arranged between the first stator and the first rotor, between the second stator and the second rotor, and between the third stator and the third rotor.

[0040] A thrust bearing is also arranged between the third stator and the fixed ring.

[0041] The hole-sweeping drill bit comprises a tapered drill bit body with a larger diameter and an open end, and a tower-shaped groove provided in the drill bit body. The inner wall of one end of the tower-shaped groove connected to the outside of the hole-sweeping drill bit is threaded and connected to the drill bit joint.

[0042] A plurality of groups of spiral cutting teeth and a plurality of groups of vertical chip cutting teeth are arranged on the outer surface of the hole sweeping drill bit.

[0043] The hole-sweeping drill bit is also provided with a water outlet hole, and the water outlet hole is connected with the tower-shaped groove and the outside of the drill bit body.

[0044] Compared with the prior art, the present invention has the following technical effects:

[0045] (I) The present invention provides a coal mine underground hole bottom power casing lowering device, which adopts a multi-stage power mechanism at the bottom of the hole to convert liquid pressure energy into mechanical energy to drive the hole sweeping drill to rotate, thereby repairing irregular hole walls and passing through collapsed hole sections. The hole sweeping drill bit has a guiding function and can be used for lowering casing in directional drilling of large curvature hole sections.

[0046] (II) The present invention provides a coal mine underground hole bottom power casing lowering device, in which the turbine group composed of the stator and the rotor is plugged into the outer tube, the rotor is plugged into the stator, and the rotors are plugged into each other. The installation is simple, the torque transmission between the rotors is direct, and the energy loss is small.

[0047] (III) The present invention provides a coal mine underground hole bottom power casing lowering device, wherein the rotor, stator, transmission shaft and hole-sweeping drill bit all adopt a hollow structure, and the inside of the hole-sweeping drill bit adopts a tower-type groove structure, which is convenient for subsequent crushing and improves the crushing efficiency of various components inside the device.

[0048] (IV) The present invention provides a power casing lowering device for the bottom of a coal mine hole. The device is provided with an impact mechanism, which can improve the hole sweeping efficiency of the hole sweeping drill bit, reduce the friction resistance between the casing and the hole wall, and help improve the casing lowering efficiency.

[0049] (V) The present invention provides a coal mine underground hole bottom dynamic casing lowering device. The device can be broken in the later stage by using a variety of combined drilling tools and a variety of breaking process methods, which is conducive to further improving the breaking efficiency of various components inside the device in the later stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0051] Figure 2 It is a schematic diagram of the top structure of the first rotor of the present invention.

[0052] Figure 3 It is a schematic diagram of the half-section structure of the first rotor of the present invention.

[0053] Figure 4 It is a schematic diagram of the top structure of the first stator of the present invention.

[0054] Figure 5 It is a schematic diagram of the full cross-section structure of the first stator of the present invention.

[0055] Figure 6 It is a schematic structural diagram of the second stator of the present invention.

[0056] Figure 7 It is a schematic structural diagram of the third stator of the present invention.

[0057] Figure 8 It is a schematic structural diagram of the transmission shaft of the present invention.

[0058] Fig. 9 It is a schematic structural diagram of an anvil of the present invention.

[0059] Fig.10 It is a schematic diagram of the half-section structure of the punch hammer of the present invention.

[0060] Fig.11 It is a schematic structural diagram of the punch hammer of the present invention.

[0061] Fig.12 It is a schematic structural diagram of the fixing ring of the present invention.

[0062] Fig.13It is a schematic structural diagram of the upper plug of the present invention.

[0063] Fig.14 It is a schematic structural diagram of the outer tube of the present invention.

[0064] Fig.15 It is a schematic structural diagram of the retaining spring of the present invention.

[0065] Fig.16 It is a schematic structural diagram of the hole-sweeping drill bit of the present invention.

[0066] Fig.17 It is a schematic diagram of the use state of the present invention.

[0067] The meaning of each symbol in the accompanying drawings:

[0068] 1-outer tube, 2-lower joint, 3-transmission shaft, 4-hole sweeping drill bit, 5-power mechanism, 6-fixing ring, 7-upper plug, 8-impact mechanism, 9-rectangular groove, 10-circlip groove, 11-circlip, 12-thrust bearing, 13-casing, 14-casing fixing flange, 15-drilling tool removal.

[0069] 3-1-drill bit joint, 3-2-annular boss, 3-3-spindle, 3-4-rotor joint, 3-5-water inlet hole, 3-6-sealing groove, 3-7-first bearing.

[0070] 4-1-drill body, 4-2-tower groove, 4-3-spiral cutting tooth, 4-4-vertical chip tooth, 4-5-water outlet hole.

[0071] 5-1-first power mechanism, 5-2-second power mechanism, 5-3-third power mechanism.

[0072] 6-1-fixing ring body, 6-2-center hole, 6-3-water guide hole.

[0073] 7-1-spherical water conductor, 7-2-tooling groove, 7-3-plug joint.

[0074] 8-1-anvil, 8-2-hammer, 8-3 spring, 8-4 spring seat.

[0075] 5-1-1-first stator, 5-1-2-first rotor.

[0076] 5-2-1- second stator, 5-2-2- second rotor.

[0077] 5-3-1-the third stator, 5-3-2-the third rotor.

[0078] 8-1-1-anvil base plate, 8-1-2-rising slope, 8-1-3-center through hole.

[0079] 8-2-1-hammer body, 8-2-2-annular boss, 8-2-3-impact tooth, 8-2-4-hammer center through hole.

[0080] 5-1-1-1-stator outer shell, 5-1-1-2 stator inner shell, 5-1-1-3-stator spiral blades, 5-1-1-4-stator center through hole, 5-1-1-5-rectangular boss.

[0081] 5-1-2-1-rotor center tube, 5-1-2-2-blade mounting tube, 5-1-2-3-rotor spiral blade, 5-1-2-4-rotor center through hole, 5-1-2-5-spline groove.

[0082] 5-2-2-6-Spline.

[0083] 5-3-2-7 internal thread section.

[0084] The specific contents of the present invention are further explained in detail below in conjunction with embodiments. DETAILED DESCRIPTION

[0085] All components in the present invention, unless otherwise specified, are components known in the prior art.

[0086] 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.

[0087] Embodiment 1:

[0088] This embodiment provides a coal mine bottom hole power casing lowering device, such as Figure 1-Figure 7 As shown, it includes an outer tube 1 and a lower joint 2 installed at one end of the outer tube 1, the lower joint 2 is a hollow structure, and one end extends into the outer tube 1, and also includes a transmission shaft 3 penetrated in the lower joint 2, and the end of the transmission shaft 3 facing away from the outer tube 1 and passing through the lower joint 2 is also installed with a hole sweeping drill bit 4, and the end of the transmission shaft 3 facing the outer tube 1 and passing through the lower joint 2 is also connected to the power mechanism 5.

[0089] The power mechanism 5 comprises a first power mechanism 5 - 1 , a plurality of second power mechanisms 5 - 2 and a third power mechanism 5 - 3 which are coaxially installed in the outer tube 1 .

[0090] The first power mechanism 5-1 includes a first stator 5-1-1 and a first rotor 5-1-2 sleeved in the first stator 5-1-1.

[0091] The first stator 5-1-1 comprises a stator outer shell 5-1-1-1 and a stator inner shell 5-1-1-2 which are coaxially sleeved. The length of the stator inner shell 5-1-1-2 is shorter than that of the stator outer shell 5-1-1-1 and one end of the stator inner shell 5-1-1-2 is flush with the stator inner shell 5-1-1-2.

[0092] A stator spiral blade 5-1-1-3 is installed between the stator outer shell 5-1-1-1 and the stator inner shell 5-1-1-2. The stator outer shell 5-1-1-1 and the stator inner shell 5-1-1-2 are both hollow cylindrical, and the center of the stator inner shell 5-1-1-2 constitutes a stator center through hole 5-1-1-4.

[0093] The first rotor 5-1-2 includes a rotor center tube 5-1-2-1 and a blade mounting tube 5-1-2-2 installed at one end of the rotor center tube 5-1-2-1, and the outer side of the blade mounting tube 5-1-2-2 is installed with a rotor spiral blade 5-1-2-3, and the centers of the rotor center tube 5-1-2-1 and the blade mounting tube 5-1-2-2 constitute a rotor center through hole 5-1-2-4.

[0094] The rotor center tube 5-1-2-1 is inserted into the stator center through hole 5-1-1-4.

[0095] The inner surface of one end of the rotor center tube 5-1-2-1 on which the rotor spiral blade 5-1-2-3 is installed is provided with a spline groove 5-1-2-5, and the side of the rotor center tube 5-1-2-1 facing away from the spline groove 5-1-2-5 is connected to the transmission shaft 3.

[0096] The second power mechanism 5-2 includes a second stator 5-2-1 and a second rotor 5-2-2 sleeved in the second stator 5-2-1.

[0097] The structure of the second stator 5-2-1 is exactly the same as that of the first stator 5-1-1, and the structure of the second rotor 5-2-2 is basically the same as that of the first rotor 5-1-2. The difference is that a spline 5-2-2-6 is provided at one end of the rotor center tube 5-1-2-1 facing away from the rotor spiral blade 5-1-2-3, and the adjacent second rotors 5-2-2 are connected to each other by keyway cooperation, and the second rotor 5-2-2 is connected to the first rotor 5-1-2 by keyway cooperation.

[0098] The third power mechanism 5-3 includes a third stator 5-3-1 and a third rotor 5-3-2 sleeved in the third stator 5-3-1.

[0099] The structure of the third stator 5-3-1 is exactly the same as that of the second stator 5-2-1, and the structure of the third rotor 5-3-2 is basically the same as that of the second rotor 5-2-2. The difference is that a spline 5-2-2-6 is provided on the end of the rotor center tube 5-1-2-1 facing away from the rotor spiral blade 5-1-2-3, and a spline groove 5-1-2-5 is not provided on the inner surface of one end of the rotor spiral blade 5-1-2-3. Instead, an internal thread section 5-3-2-7 is provided on the side of the rotor center through hole 5-1-2-4 close to the blade. The end of the third rotor 5-3-2 with the spline 5-2-2-6 is connected to the second rotor 5-2-2.

[0100] The outer tube 1 is provided with a lower joint 2 at one end and a fixing ring 6 at the other end. The fixing ring 6 is a hollow structure. The other end of the third rotor 5-3-2 is connected to an upper plug 7, and the upper plug 7 is passed through the fixing ring 6.

[0101] The transmission shaft 3 is sleeved with an impact mechanism 8 .

[0102] The first stator 5-1-1 and the first rotor 5-1-2 constitute a turbine group, the second stator 5-2-1 and the second rotor 5-2-2 constitute a turbine group, and the third stator 5-3-1 and the third rotor 5-3-2 constitute a turbine group.

[0103] The first rotor 5-1-2 is a hollow structure as a whole, and a spline groove 5-1-2-5 is provided on the upper end face. The blade mounting tube 5-1-2-2 is provided with 6 groups of rotor spiral blades 5-1-2-3 evenly distributed around the circumference. The rotor spiral blades 5-1-2-3 communicate with the upper end face and the lower end face of the upper end structure of the first rotor 5-1-2. The upper end face is used as a reference surface. The spiral angle of the rotor spiral blades 5-1-2-3 of the first rotor 5-1-2 is 30° counterclockwise. A rotor center through hole 5-1-2-4 is provided in the middle of the first rotor 5-1-2. The rotor center through hole 5-1-2-4 makes the first rotor 5-1-2 a thin-walled structure as a whole, which is convenient for later crushing. The first rotor 5-1-2 is connected to the rotor joint 3-4.

[0104] The first stator 5-1-1 is a cylindrical structure as a whole, including a stator shell 5-1-1-1, and the outer ring of the stator shell 5-1-1-1 is provided with two rectangular bosses 5-1-1-5. The center of the first stator 5-1-1 is a stator center through hole 5-1-1-4, and the first rotor 5-1-2 passes through the stator center through hole 5-1-1-4 and can rotate freely in the stator center through hole 5-1-1-4.

[0105] A stator spiral blade 5-1-1-3 is provided between the stator housing 5-1-1-1 and the stator center through hole 5-1-1-4, and the spiral angle of the stator spiral blade 5-1-1-3 is 30° clockwise, which is opposite to the spiral angle of the rotor spiral blade 5-1-2-3 of the first rotor 5-1-2. A thrust bearing 12 is provided, and the thrust bearing 12 is sleeved on the first rotor 5-1-2 and located between the lower end surface of the lowermost rotor and the upper end surface of the first stator 5-1-1, to ensure the stability of the rotor rotation and withstand a certain axial pressure.

[0106] The first rotor 5-1-2, the second rotor 5-2-2 and the third rotor 5-3-2 are exactly the same in size. Compared with the first rotor 5-1-2, the second rotor 5-2-2 lacks the thread for connecting with the transmission shaft 3, and a spline 5-2-2-6 is added. The outer contour of the spline 5-2-2-6 is consistent with the spline groove 5-1-2-5. The spline 5-2-2-6 is plugged into the spline groove 5-1-2-5 to ensure the transmission of torque. Compared with the second rotor 5-2-2, the third rotor 5-3-2 lacks the spline groove 5-1-2-5, and the third rotor 5-3-2 is connected to the plug 7.

[0107] As a preferred embodiment of this invention:

[0108] like Figure 8 As shown, the transmission shaft 3 comprises a drill head joint 3-1, an annular boss 3-2, a main shaft 3-3 and a rotor joint 3-4 which are coaxially connected in sequence.

[0109] The drill bit joint 3 - 1 is in the shape of a hollow cylinder, with threads formed on the outer surface thereof, and is connected to the hole sweeping drill bit 4 .

[0110] The annular boss 3 - 2 is in the shape of a hollow cylinder with a diameter larger than that of the drill joint 3 - 1 , and the outer side surface contacts the inner wall of the lower joint 2 .

[0111] The spindle 3-3 is a hollow cylinder with one end open, and the internal cavity is connected to the internal cavity of the drill bit joint 3-1. The diameter of the spindle 3-3 is smaller than the annular boss 3-2, and the outer surface of the spindle 3-3 facing away from the annular boss 3-2 is provided with a thread.

[0112] The rotor joint 3-4 is a solid cylindrical body with a diameter smaller than the main shaft 3-3, with threads on the outside, and is connected to the rotor center tube 5-1-2-1 of the first rotor 5-1-2.

[0113] The main shaft 3 - 3 is provided with a water inlet hole 3 - 5 , which is connected to the inside and outside of the transmission shaft 3 .

[0114] As a preferred embodiment of this invention:

[0115] A sealing groove 3-6 is provided on the outer side surface of the annular boss 3-2, and a sealing ring is installed in the sealing groove 3-6.

[0116] A sealing groove 3-6 is provided on the outer side surface between the thread and the annular boss 3-2, and a sealing ring is installed in the sealing groove 3-6.

[0117] The main shaft 3 - 3 is also sleeved with a first bearing 3 - 7 , and the outer ring of the first bearing 3 - 7 is in contact with the inner wall of the lower joint 2 .

[0118] The lower end of the transmission shaft 3 is a drill joint 3-1, which is threadedly connected to the hole-sweeping drill bit 4. The outer ring of the annular boss 3-2 is provided with two sealing grooves 3-6. The right side of the annular boss 3-2 is provided with a main shaft 3-3. The first bearing 3-7 is sleeved on the main shaft 3-3 and contacts with the upper end surface of the annular boss 3-2. Two sealing grooves 3-6 are provided in the middle of the main shaft 3-3. The upper end of the main shaft 3-3 is provided with a male thread section for connecting the anvil 8-1. The hammer 8-2 is sleeved on the main shaft 3-3. The upper end of the transmission shaft 3 is a rotor joint 3-4. The transition section between the rotor joint 3-4 and the main shaft 3-3 is provided with 6 water inlet holes 3-5 evenly distributed around the circumference. The lower joint 2 is sleeved on the outside of the transmission shaft 3. The first bearing 3-7 presses against the upper end surface of the lower joint 2 on one side, and performs radial sealing through a sealing ring sleeved on the transmission shaft 3 to ensure that the liquid pressure does not leak.

[0119] As a preferred embodiment of this invention:

[0120] like Figure 9-11 As shown, the impact mechanism 8 includes an anvil 8-1 and a hammer 8-2.

[0121] The anvil 8-1 includes a circular anvil base plate 8-1-1 and a plurality of ascending inclined surfaces 8-1-2 installed on one side of the anvil base plate 8-1-1. The center of the anvil base plate 8-1-1 constitutes an anvil center through hole 8-1-3. The spindle 3-3 is inserted into the anvil center through hole 8-1-3 and connected to the anvil center through hole 8-1-3 through threads.

[0122] The hammer 8-2 includes a circular hammer body 8-2-1, an annular boss 8-2-2 installed on one side of the hammer body 8-2-1, and a plurality of impact teeth 8-2-3 installed on the other side of the hammer body 8-2-1. The center of the hammer body 8-2-1 constitutes a hammer center through hole 8-2-4. The hammer body 8-2-1 is sleeved on the outside of the main shaft and is not connected to the main shaft 3-3.

[0123] A spring 8-3 is also installed on the inner side of the annular boss 8-2-2, and the other end of the spring 8-3 is placed on a spring seat 8-4-4. The spring seat 8-4-4 is sleeved on the outer side of the rotor center tube 5-1-2-1 of the first rotor 5-1-2 and connected to the end face of the first stator 5-1-1. The spring 8-3 is sleeved on the outer side of the main shaft 3-3 and the rotor joint 3-4.

[0124] The impact teeth 8-2-3 cooperate with the rising inclined surface 8-1-2 and the number of the impact teeth 8-2-3 is the same as the number of the rising inclined surface 8-1-2.

[0125] The anvil 8-1 is an annular structure as a whole and is provided with an anvil center through hole 8-1-3 in the center. The anvil center through hole 8-1-3 is provided with a female thread, which is connected to the male thread at the upper end of the main shaft 3-3. The upper end face of the anvil 8-1 is provided with four circumferentially evenly distributed rising inclined surfaces 8-1-2. The rising angle of the inclined surface is 15° to 30° counterclockwise, and the lifting height is 1 to 2 cm. This embodiment adopts a rising angle of 15° and a lifting height of 1 cm.

[0126] The hammer 8-2 is an annular structure as a whole, with an annular boss 8-2-2 at the upper end, one end of the spring 8-3 is placed in the annular boss 8-2-2, a hammer center through hole 8-2-4 is provided in the middle of the hammer 8-2, the inner diameter of the hammer center through hole 8-2-4 is slightly larger than the outer diameter of the main shaft 3-3, ensuring that the hammer 8-2 can reciprocate along the main shaft 3-3, and the lower end of the hammer is provided with 4 circumferentially evenly distributed impact teeth 8-2-3, the two sides of the impact teeth 8-2-3 are arc-shaped structures and the height is 1cm, and the height of the impact teeth 8-2-3 is determined by the lifting height of the rising slope 8-1-2. The other end of the spring 8-3 is placed on the spring seat 8-4, and the spring seat 8-4 is sleeved on the first rotor 5-1-2 and is located on the lower end surface of the first stator 5-1-1.

[0127] Specifically, during the working process, the anvil 8-1 rotates together with the transmission shaft 3, and the anvil 8-1 rotates forward so that the impact tooth 8-2-3 is lifted to the highest point along the rising slope 8-1-2. At this time, the spring 8-3 is compressed and stored. When the impact tooth 8-2-3 passes the highest point of the rising slope 8-1-2, the impact tooth 8-2-3 instantly falls and impacts the anvil 8-1 under the action of the spring 8-3. The anvil 8-1 rotates 1 circle, and the number of impacts is 4 times. The impact frequency can be increased by changing the number of rising slopes 501 and impact teeth 8-2-3. At the same time, the spring hardness, lifting height, and hammer quality can be adjusted to improve the impact work.

[0128] As a preferred embodiment of this invention:

[0129] A rectangular boss 5-1-1-5 is also arranged on the outer periphery of the stator housing 5-1-1-1, and the rectangular boss 5-1-1-5 cooperates with the rectangular groove 9 opened on the inner wall of the outer tube 1.

[0130] A retaining spring groove 10 is also provided on the inner wall of the outer tube 1, and a retaining spring 11 is installed in the retaining spring groove 10. The retaining spring 11 is used to limit the position of the third stator 5-3-1.

[0131] The fixing ring 6 comprises a disc-shaped fixing ring body 6-1, a center hole 6-2 opened at the center of the fixing ring body 6-1, and a plurality of water guide holes 6-3 opened along the circumference of the fixing ring body 6-1.

[0132] The upper plug 7 comprises a spherical water guide 7-1, a tooling groove 7-2 and a plug joint 7-3 which are connected in sequence. The plug joint 7-3 is connected to the third rotor 5-3-2. The spherical water guide 7-1 is located and installed in the center hole 6-2.

[0133] like Figure 14-15 As shown, the outer tube 1 as a whole is a male and female head structure, one end of the female head is connected to the lower joint 2, and the male head is connected to the casing to be lowered. A rectangular groove 9 is provided at one end of the male head, and the contour of the rectangular groove 9 is consistent with the contour of the rectangular boss 5-1-1-5, so that the first stator 5-1-1 can be plugged and matched in the outer tube 1, and the first stator 5-1-1 is radially fixed and circumferentially limited. A retaining spring groove 10 is provided on the inner side of one end of the male head, and a female thread section is provided on the inner wall of the upper end of the retaining spring groove 10. The multiple turbine groups are placed in the inner tube, and the turbine group stator is axially fixed by a retaining spring 11, and the turbine group rotor is axially fixed by connecting and cooperating with the female thread section of the outer tube 1 through a fixing ring 6.

[0134] like Fig.12 As shown, the fixing ring 6 is a disc-shaped structure as a whole, and the outer ring of the fixing ring is provided with a male thread section for connecting and cooperating with the female thread section of the outer tube 1. The inner hole is slightly larger than the outer diameter of the upper plug 7, and six water guide holes 6-3 are provided on the disc surface of the fixing ring 6.

[0135] like Fig.13 As shown, the top of the upper plug 7 is a spherical water guide 7-1, which serves to seal the central through hole 5-1-2-4 of the rotor and divert the liquid to the rotor spiral blades 5-1-2-3. A tooling groove 7-2 is provided in the middle of the upper plug 7 to facilitate the installation of the plug. The lower end of the upper plug 7 is a plug joint 7-3, which is connected with the third rotor 5-3-2.

[0136] As a preferred embodiment of this invention:

[0137] Thrust bearings 12 are arranged between the first stator 5-1-1 and the first rotor 5-1-2, between the second stator 5-2-1 and the second rotor 5-2-2, and between the third stator 5-3-1 and the third rotor 5-3-2.

[0138] A thrust bearing 12 is also arranged between the third stator 5 - 3 - 1 and the fixing ring 6 .

[0139] As a preferred embodiment of this invention:

[0140] like Fig.16 As shown, the hole-sweeping drill bit 4 includes a tapered drill bit body 4-1 with a larger diameter and an open end, and a tower groove 4-2 opened in the drill bit body 4-1. The tower groove 4-2 is connected to the inner wall of one end of the hole-sweeping drill bit 4 and is threaded and connected to the drill bit joint 3-1.

[0141] The outer surface of the hole sweeping drill 4 is also provided with a plurality of groups of spiral cutting teeth 4 - 3 and a plurality of groups of vertical chip cutting teeth 4 - 4 .

[0142] The hole-sweeping drill bit 4 is also provided with a water outlet hole 4-5, and the water outlet hole 4-5 is connected with the tower groove 4-2 and the outside of the drill bit body 4-1.

[0143] The drill body 4-1 of the hole-sweeping drill bit 4 is an arc-shaped hollow structure as a whole. The front end of the drill body 4-1 is provided with 6 circumferentially evenly distributed water holes 4-5 for cooling the chip teeth and flushing the rock chips in the hole. The upper end of the water holes 4-5 is 8 groups of spiral cutting teeth 4-3, the spiral rising angle is 30° and the 8 groups are evenly distributed around the circumference. A group of vertical chip teeth 4-4 is provided on the upper end of each group of spiral cutting teeth 4-3. The interior of the drill body 4-1 is a hollow structure, specifically a tower groove 4-2 structure. The uppermost end of the drill body 4-1 is provided with a female thread. The arc-shaped structure of the drill body 4-1 plays a guiding role to ensure that the hole-sweeping drill bit 4 can extend in the original hole. The spiral cutting teeth 4-3 are used to repair irregular hole walls. The vertical chip teeth 4-4 are used to ensure that the borehole diameter and hole wall are smooth and reduce the resistance to lowering the casing behind. The tower groove 4-2 structure serves to facilitate subsequent crushing.

[0144] A method for using a power casing lowering device at the bottom of a coal mine, such as Figure 1 to Figure 17 As shown, the specific steps include:

[0145] Step 1: Casing lowering steps, follow Figure 1Assemble the bottom hole power casing lowering device, and install it on the downhole drilling rig after assembly. Use the drilling rig to add casing 13, and 2-3 casings 13 can be added at one time. Install a water feeder behind the casing 13, and the compressed liquid enters the bottom hole power casing lowering device along the casing 13 to drive multiple turbine groups to work. Since the rotors use a spline structure to transmit torque, the torque generated by multiple turbine groups is superimposed and transmitted to the transmission shaft 3. The transmission shaft 3 drives the hole sweeping drill bit 4 to rotate. Under the feeding of the drilling rig, the hole sweeping drill bit 4 grinds the irregular well wall, so that the hole wall diameter is consistent and the surface is smooth. At the same time, the rotation of the transmission shaft 3 drives the anvil 8-1 to rotate, thereby driving the hammer 8-2 to reciprocate and impact the anvil 8-1. The impact energy is transmitted to the hole sweeping drill bit 4 along the transmission shaft, improving the crushing efficiency and reducing the resistance to the lowering of the casing 13. Repeat the above steps until the casing 13 is lowered to the target layer.

[0146] Step 2: Device breaking step. After the casing 13 is lowered, the water feeder is disassembled and a casing fixing flange 14 is installed at the end of the last casing 13. The casing fixing flange 14 is fixed to the original orifice flange of the borehole. The casing fixing flange 14 and the following casings 13 can also be grouted in the borehole annulus (the 2-blocking and 1-injection method can be used). The purpose is to radially and axially fix the entire device in the hole, and then lower the breaking drill 15. The size of the breaking drill bit can be close to the inner diameter of the casing. The breaking drill tool combination used can be: (1) Use a carbide drill bit with a conventional drill bit to grind the internal components of the bottom hole power casing lowering device until it passes through the hole-sweeping drill bit 4; (2) Use a PDC composite drill bit with a hydraulic impactor and a conventional drill pipe to impact and rotate to break the internal components of the bottom hole power casing lowering device until it passes through the hole-sweeping drill bit 4. When the annular return water of the whole set of equipment and the breaking drill tool combination is a mixture of coal or rock, it is judged that the hole sweeping drill bit 4 has passed through and the breaking drill tool 15 has been withdrawn, and the next construction operation can be carried out.

[0147] The above technical solutions are only preferred specific implementation methods of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be conceived by any technician familiar with the field within the technical scope disclosed by the present invention without creative work are all covered within the protection scope of the present invention.

Claims

1. A power casing lowering device for the bottom of a coal mine, comprising an outer tube (1) and a lower joint (2) installed at one end of the outer tube (1), wherein the lower joint (2) is a hollow structure and one end of the lower joint extends into the outer tube (1), and further comprising a transmission shaft (3) passing through the lower joint (2), wherein the transmission shaft (3) is facing away from the outer tube (1) and one end of the transmission shaft (3) passing through the lower joint (2) is also installed with a hole sweeping drill bit (4), characterized in that: The end of the transmission shaft (3) facing the outer tube (1) and passing through the lower joint (2) is also connected to the power mechanism (5); The power mechanism (5) comprises a first power mechanism (5-1), a plurality of second power mechanisms (5-2) and a third power mechanism (5-3) which are coaxially installed in the outer tube (1); The first power mechanism (5-1) comprises a first stator (5-1-1) and a first rotor (5-1-2) sleeved in the first stator (5-1-1); The first stator (5-1-1) comprises a stator outer shell (5-1-1-1) and a stator inner shell (5-1-1-2) which are coaxially sleeved, the stator inner shell (5-1-1-2) is shorter than the stator outer shell (5-1-1-1) and one end is flush with the stator inner shell (5-1-1-2); A stator spiral blade (5-1-1-3) is installed between the stator outer shell (5-1-1-1) and the stator inner shell (5-1-1-2); the stator outer shell (5-1-1-1) and the stator inner shell (5-1-1-2) are both hollow cylindrical, and the center of the stator inner shell (5-1-1-2) forms a stator center through hole (5-1-1-4); The first rotor (5-1-2) comprises a rotor center tube (5-1-2-1) and a blade mounting tube (5-1-2-2) mounted at one end of the rotor center tube (5-1-2-1), a rotor spiral blade (5-1-2-3) is mounted on the outer side of the blade mounting tube (5-1-2-2), and the centers of the rotor center tube (5-1-2-1) and the blade mounting tube (5-1-2-2) form a rotor center through hole (5-1-2-4); The rotor center tube (5-1-2-1) is inserted into the stator center through hole (5-1-1-4); The inner surface of one end of the rotor center tube (5-1-2-1) on which the rotor spiral blade (5-1-2-3) is installed is provided with a spline groove (5-1-2-5), and the side of the rotor center tube (5-1-2-1) facing away from the spline groove (5-1-2-5) is connected to the transmission shaft (3); The second power mechanism (5-2) comprises a second stator (5-2-1) and a second rotor (5-2-2) sleeved in the second stator (5-2-1); The structure of the second stator (5-2-1) is the same as that of the first stator (5-1-1), and the structure of the second rotor (5-2-2) is the same as that of the first rotor (5-1-2), except that a spline (5-2-2-6) is provided at one end of the rotor center tube (5-1-2-1) facing away from the rotor spiral blade (5-1-2-3), and the adjacent second rotors (5-2-2) are connected to each other, and the second rotor (5-2-2) is connected to the first rotor (5-1-2); The third power mechanism (5-3) comprises a third stator (5-3-1) and a third rotor (5-3-2) sleeved in the third stator (5-3-1); The structure of the third stator (5-3-1) is the same as that of the first stator (5-1-1), and the structure of the third rotor (5-3-2) is the same as that of the first rotor (5-1-2), except that a spline (5-2-2-6) is provided at one end of the rotor center tube (5-1-2-1) facing away from the rotor spiral blade (5-1-2-3), and an internal thread section (5-3-2-7) is provided at the other end of the rotor center tube (5-1-2-1), and the end of the third rotor (5-3-2) provided with the spline (5-2-2-6) is connected to the second rotor (5-2-2); The outer tube (1) is provided with a lower joint (2) at one end, and a fixing ring (6) is provided at the other end. The fixing ring (6) is a hollow structure. The other end of the third rotor (5-3-2) is connected to an upper plug (7). The upper plug (7) is provided on the fixing ring (6). An impact mechanism (8) is sleeved on the transmission shaft (3).

2. The power casing lowering device for the bottom hole of a coal mine as claimed in claim 1, characterized in that: The transmission shaft (3) comprises a drill bit joint (3-1), an annular boss (3-2), a main shaft (3-3) and a rotor joint (3-4) which are coaxially connected in sequence; The drill bit joint (3-1) is in the shape of a hollow cylinder, with a thread formed on the outer surface thereof, and is connected to the hole sweeping drill bit (4); The annular boss (3-2) is in the shape of a hollow cylinder with a diameter greater than that of the drill bit joint (3-1), and the outer side surface is in contact with the inner wall of the lower joint (2); The spindle (3-3) is in the shape of a hollow cylinder with one end open, the internal cavity is connected to the internal cavity of the drill bit joint (3-1), the diameter of the spindle (3-3) is smaller than the annular boss (3-2), and a thread is provided on the outer surface of the spindle (3-3) on the side facing away from the annular boss (3-2); The rotor joint (3-4) is in the shape of a solid cylinder with a diameter smaller than that of the main shaft (3-3), has a thread on the outside, and is connected to the rotor center tube (5-1-2-1) of the first rotor (5-1-2); The main shaft (3-3) is provided with a water inlet hole (3-5), and the water inlet hole (3-5) is connected with the inside and outside of the transmission shaft (3).

3. The power casing lowering device for the bottom hole of a coal mine as claimed in claim 2, characterized in that: A sealing groove (3-6) is provided on the outer side surface of the annular boss (3-2), and a sealing ring is installed in the sealing groove (3-6); A sealing groove (3-6) is provided on the outer side surface between the thread and the annular boss (3-2), and a sealing ring is installed in the sealing groove (3-6); The main shaft (3-3) is also sleeved with a first bearing (3-7), and the outer ring of the first bearing (3-7) is in contact with the inner wall of the lower joint (2).

4. The power casing lowering device for the bottom hole of a coal mine as claimed in claim 2, characterized in that: The impact mechanism (8) comprises an anvil (8-1) and a hammer (8-2); The anvil (8-1) comprises an annular anvil base plate (8-1-1) and a plurality of ascending inclined surfaces (8-1-2) mounted on one side of the anvil base plate (8-1-1); the center of the anvil base plate (8-1-1) forms an anvil center through hole (8-1-3); the spindle (3-3) is inserted into the anvil center through hole (8-1-3) and connected to the anvil center through hole (8-1-3) via a thread; The hammer (8-2) comprises a circular hammer body (8-2-1), an annular boss (8-2-2) installed on one side of the hammer body (8-2-1), and a plurality of impact teeth (8-2-3) installed on the other side of the hammer body (8-2-1); the center of the hammer body (8-2-1) forms a hammer center through hole (8-2-4); the hammer body (8-2-1) is sleeved on the outside of the main shaft and is not connected to the main shaft (3-3); A spring (8-3) is also installed inside the annular boss (8-2-2), and the other end of the spring (8-3) is placed on a spring seat (8-4). The spring seat (8-4) is sleeved on the outside of the rotor center tube (5-1-2-1) of the first rotor (5-1-2) and connected to the end surface of the first stator (5-1-1). The spring (8-3) is sleeved on the outside of the main shaft (3-3) and the rotor joint (3-4). The impact teeth (8-2-3) match the rising inclined surface (8-1-2) and the number of the impact teeth (8-2-3) is the same as the number of the rising inclined surface (8-1-2).

5. The power casing lowering device for the bottom hole of a coal mine as claimed in claim 1, characterized in that: A rectangular boss (5-1-1-5) is also arranged on the outer periphery of the stator housing (5-1-1-1), and the rectangular boss (5-1-1-5) cooperates with a rectangular groove (9) provided on the inner wall of the outer tube (1); A retaining spring groove (10) is also provided on the inner wall of the outer tube (1), a retaining spring (11) is installed in the retaining spring groove (10), and the retaining spring (11) is used to limit the position of the third stator (5-3-1); The fixing ring (6) comprises a disc-shaped fixing ring body (6-1), a center hole (6-2) opened at the center of the fixing ring body (6-1), and a plurality of water guide holes (6-3) opened along the circumference of the fixing ring body (6-1); The upper plug (7) comprises a spherical water guide (7-1), a tooling groove (7-2) and a plug joint (7-3) which are connected in sequence, the plug joint (7-3) is connected to the third rotor (5-3-2), and the spherical water guide (7-1) is located and installed in the center hole (6-2).

6. The power casing lowering device for the bottom hole of a coal mine as claimed in claim 1, characterized in that: Thrust bearings (12) are arranged between the first stator (5-1-1) and the first rotor (5-1-2), between the second stator (5-2-1) and the second rotor (5-2-2), and between the third stator (5-3-1) and the third rotor (5-3-2); A thrust bearing (12) is also arranged between the third stator (5-3-1) and the fixing ring (6).

7. The coal mine bottom hole power casing lowering device according to claim 2, characterized in that: The hole-sweeping drill bit (4) comprises a tapered drill bit body (4-1) with a larger diameter and an open end, and a tower-shaped groove (4-2) provided in the drill bit body (4-1); the tower-shaped groove (4-2) is threaded on the inner wall of one end connected to the outside of the hole-sweeping drill bit (4) and connected to the drill bit joint (3-1); The outer surface of the hole-sweeping drill bit (4) is also provided with a plurality of groups of spiral cutting teeth (4-3) and a plurality of groups of vertical chip cutting teeth (4-4); The hole-sweeping drill bit (4) is also provided with a water outlet hole (4-5), and the water outlet hole (4-5) is connected to the tower-shaped groove (4-2) and the outside of the drill bit body (4-1).

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