Hole enlarging device and method for underground coal mine tunnel

Abstract

A hole enlarging device and method for underground tunnels in a coal mine, comprising a cylinder shell (2) used as a shell support, a cutting knife (6) arranged on the cylinder shell (2), and a central axis (5) arranged between the cutting knife (6) and the cylinder shell (2); the cylinder shell (2) is used to realize integrated installation of the cutting knife (6) and the central axis (5); the cutting knife (6) and the central axis (5) are used to cut and enlarge the inner wall of a gas extraction hole or the inner wall of a coal seam pressure relief hole, thereby realizing the generation of crack gaps on the peripheral side of the hole body, thereby improving the treatment effect of gas extraction or coal seam pressure relief.

Description

Technical Field

[0001] The invention relates to a hole enlarging device and method, in particular to a hole enlarging device and method for underground coal mine tunnels. Background Art

[0002] When gas extraction or coal seam pressure relief treatment is carried out in underground coal mine tunnels, it is necessary to drill holes in the coal seams to obtain gas extraction holes or coal seam pressure relief holes. In order to improve the effect of gas extraction or coal seam pressure relief treatment, the gas extraction holes or coal seam pressure relief holes need to be expanded to obtain gaps between coal seams. Therefore, the hole expansion device and method for underground coal mine tunnels are an important coal mine component. In the existing hole expansion device and method for underground coal mine tunnels, ordinary drill bits are still used to expand the original hole body. Since only the diameter of the original hole body can be increased, crack gaps cannot be generated on the surrounding sides of the original hole body, thereby affecting the treatment effect of gas extraction or coal seam pressure relief.

[0003] Based on the technical briefing document provided by the applicant on September 15, 2021, which solves practical technical problems in the work process, and the existing technical problems, technical features and technical effects in similar patent literature and background technologies obtained through retrieval, the technical application solution of the present invention was made. Summary of the invention

[0004] The object of the present invention is a hole enlarging device for underground coal mine tunnels.

[0005] The object of the present invention is a hole enlarging method for underground coal mine tunnels.

[0006] In order to overcome the above technical shortcomings, the purpose of the present invention is to provide a hole expansion device and method for underground coal mine tunnels, thereby improving the treatment effect of gas extraction or coal seam pressure relief.

[0007] To achieve the above purpose, the technical solution adopted by the present invention is: a hole expanding device for underground coal mine tunnels, comprising a cylinder shell used as a shell support, a cutting knife arranged on the cylinder shell, and a central axis arranged between the cutting knife and the cylinder shell.

[0008] Due to the design of the cylinder shell, cutter and central axis, the integrated installation of the cutter and the central axis is realized through the cylinder shell. Through the cutter and the central axis, the inner wall of the gas extraction hole or the inner wall of the coal seam pressure relief hole can be cut and expanded, and crack gaps are generated on the peripheral sides of the hole body, thereby improving the treatment effect of gas extraction or coal seam pressure relief.

[0009] The present invention is designed to connect the shell, the cutter and the center axis to each other in a manner that crack gaps are generated on the inner wall of the gas extraction hole or the inner wall of the coal seam pressure relief hole.

[0010] The present invention is designed to connect the cutter and the center axis with the cylinder shell in a manner that crack gaps are generated on the inner wall of the gas extraction hole or the inner wall of the coal seam pressure relief hole through scratching and water flow impact.

[0011] The technical effects of the above three technical solutions are: realizing the hole expansion processing of the swing wing and improving the efficiency of hole expansion.

[0012] The present invention is designed to further include a first accessory device, and the first accessory device is arranged on the cartridge shell, and the first accessory device is arranged to include a female connector and a one-way valve.

[0013] The present invention is designed to further include a second accessory device, and the second accessory device is arranged between the middle shaft and the barrel shell, and the second accessory device is arranged to include a rear bushing and a front bushing.

[0014] The present invention is designed to further include a third accessory device and the third accessory device is arranged between the middle shaft and the cylinder shell. The third accessory device is arranged to include a faucet barrel, a male joint, a return spring and a stop shaft.

[0015] The present invention is designed to further include a fourth accessory device, and the fourth accessory device is arranged on the first accessory device, and the fourth accessory device is arranged as a filter net.

[0016] The present invention is designed to further include a fifth accessory device and the fifth accessory device is arranged on the middle shaft, and the fifth accessory device is arranged as a nut plug.

[0017] The technical effect of the above five technical solutions is: realizing the integrated installation of other components.

[0018] The present invention is designed that a female joint, a rear bushing, a front bushing and a male joint are respectively arranged on the cylinder shell, a central axis is arranged between the rear bushing and the front bushing, and a cutting knife is arranged between the central axis and the cylinder shell, a filter screen is arranged on the female joint, a nut plug and a faucet tube are arranged on the central axis, a stop shaft is arranged between the male joint and the central axis, and a return spring is arranged between the stop shaft and the central axis, and a one-way valve is arranged on the male joint.

[0019] The technical effect of the above technical scheme is that the basic technical scheme of the present invention is composed of the female joint, the cylinder shell, the filter screen, the rear bushing, the middle shaft, the cutter, the nut plug, the front bushing, the faucet tube, the male joint, the return spring, the stop shaft and the one-way valve, which solves the technical problem of the present invention.

[0020] The present invention is designed that a rear accommodating hole body and a rear threaded hole body are respectively arranged at the rear end head of the barrel portion of the barrel shell, and a front accommodating hole body and a front threaded hole body are respectively arranged at the front end head of the barrel portion, a first leakage hole body and a second leakage hole body are respectively arranged in the middle part of the peripheral side surface of the barrel portion, and the first leakage hole body and the second leakage hole body are respectively arranged to be connected to the cutter accommodating type, the rear accommodating hole body is arranged to be connected to the rear bushing and the rear threaded hole body is arranged to be threadedly connected to the female joint, the front accommodating hole body is arranged to be connected to the front bushing and the front threaded hole body is arranged to be threadedly connected to the male joint, the barrel portion is arranged to be a circular tubular body and the rear accommodating hole body , the rear threaded hole body, the front accommodating hole body and the front threaded hole body are respectively arranged as circular hole-shaped bodies, the rear accommodating hole body and the rear threaded hole body are arranged to be distributed in a convex shape, and the front accommodating hole body and the front threaded hole body are arranged to be distributed in a convex shape, the first leakage hole body and the second leakage hole body are arranged to be long strip hole bodies, and the first leakage hole body and the second leakage hole body are arranged to be arranged and distributed at intervals along the peripheral side surface of the cylinder, and the rear end portion of the inner wall of the first leakage hole body and the rear end portion of the inner wall of the second leakage hole body are respectively provided with rotating hole bodies, and the rotating hole body of the first leakage hole body and the rotating hole body of the second leakage hole body are respectively arranged to be connected to the pin shaft located on the cutting knife.

[0021] The technical effect of the above technical solution is that the extended support of the barrel rod is realized, and the need for entering the drilling hole is met.

[0022] The present invention is designed that a rack body is arranged at the rear side of the shaft portion of the central shaft and a through hole body is arranged in the shaft portion, a water spray hole body is arranged on the rear side of the shaft portion and a connecting threaded hole body is arranged at the rear end head of the shaft portion, a connecting accommodating hole body is arranged at the front end head of the shaft portion and the rack body is arranged to be meshed with the cutter, the rear end head of the shaft portion is arranged to be connected in series with the rear bushing and the front end head of the shaft portion is arranged to be connected in series with the front bushing, the water spray hole body is arranged to be distributed corresponding to the cutter and the connecting threaded hole body is arranged to be connected to the nut plug, the connecting accommodating hole body is arranged to be connected to the faucet barrel and the shaft portion is arranged to be a circular rod-shaped body, the rack body is arranged to be a straight rack and the through hole body, the water spray hole body, the connecting threaded hole body and the connecting accommodating hole body are arranged to be circular hole-shaped bodies, the water spray hole body is arranged to be connected in a communication manner with the through hole body and the water spray hole bodies are arranged to be arranged and distributed at intervals along the transverse center line of the shaft portion.

[0023] The technical effect of the above technical solution is: realizing meshing transmission and realizing impact cutting of high-pressure water conservancy.

[0024] The present invention is designed that the cutting knife is configured to include a knife portion and a buffer strip portion, and the outer end of the knife portion is configured to be connected to the buffer strip portion, a tooth body is arranged on the rear end arc side portion of the knife portion, and the rear end of the knife portion is arranged to be connected to the cylinder shell through a pin shaft, the tooth body is arranged to be meshingly connected to the central axis, and the buffer strip portion is arranged to be contactingly connected to the central axis, the knife portion is configured to be a strip body, and the buffer strip portion is configured to be a rubber corrugated strip, the tooth body is configured to be a straight tooth body, and the tooth body is configured to be arranged and distributed at intervals along the rear end arc side portion of the knife portion.

[0025] The technical effect of the above technical solution is that the strip cutting and hole enlarging process is realized.

[0026] The present invention designs that the female joint is configured as a circular cylindrical body and the inner end threaded body of the female joint is configured to be connected to the cylinder shell, the inner end open part of the female joint is configured to be connected to the filter screen in an accommodating manner and the outer end open part threaded body of the female joint is configured to be connected to the drill rod.

[0027] The present invention is designed that the one-way valve is configured to include a valve core, a thrust spring and a valve seat, and the valve core is configured to be connected in series with the thrust spring and the valve seat respectively, one of the ends of the thrust spring is configured to be contact-connected with the front end surface portion of the valve core and the other end of the thrust spring is configured to be contact-connected with the rear end surface portion of the valve seat, the valve core is configured to be contact-connected with the male joint and the valve seat is configured to be threadedly connected with the male joint, the valve core is configured to be a T-shaped rod-shaped body and the thrust spring is configured to be a columnar spring, and the valve seat is configured to be a disc-shaped body with an accommodating annular groove on the rear end surface portion.

[0028] The technical effect of the above two technical solutions is that: the external connection part of the end of the cylinder shell is set.

[0029] The present invention is designed that the rear bushing is set as an I-shaped cylindrical body and the rear bushing is set to be embedded in the cylinder shell, the rear bushing is set to be sleeve-type connected to the middle shaft and the front end surface of the rear bushing is set to be contact-type connected to the cylinder shell, and the rear end surface of the rear bushing is set to be contact-type connected to the female joint.

[0030] The present invention is designed that the front bushing is arranged as an I-shaped cylindrical body and the front bushing is arranged as an embedded connection with the cylinder shell, the front bushing is arranged as a sleeve connection with the middle shaft and the rear end surface portion of the front bushing is arranged as a contact connection with the cylinder shell, and the front end surface portion of the front bushing is arranged as a contact connection with the male joint.

[0031] The technical effect of the above two technical solutions is that the end support of the central axis is realized.

[0032] The present invention designs that the faucet barrel is configured as a round rod-shaped body with a middle hole and the faucet barrel is configured to be embeddedly connected with the central axis, the middle hole of the faucet barrel is configured to be sleeve-connected with the stop shaft and the front end surface portion of the faucet barrel is configured to be contact-connected with the return spring.

[0033] The present invention is designed that a rear accommodating cavity is provided at the rear end head of the head of the male connector and a front accommodating cavity is provided at the front end head of the head, the rear end head of the head is arranged to be connected with the cylinder shell and the rear accommodating cavity is arranged to be connected with the return spring and the stop shaft in an accommodating manner, the front accommodating cavity is arranged to be connected with the one-way valve in an accommodating manner and the middle hole body of the partition part located between the front accommodating cavity and the rear accommodating cavity is arranged to be connected with the stop shaft in a contact manner, the head is arranged to be a circular cylindrical body and the front accommodating cavity is arranged to be a circular hole body, and the rear accommodating cavity is arranged to be a convex hole body.

[0034] The present invention designs that the return spring is configured as a columnar spring and is configured to be sleeve-connected with the stop shaft, one end of the return spring is configured to be contact-connected with the stop shaft and the other end of the return spring is configured to be contact-connected with the faucet barrel.

[0035] The present invention is designed that the stop shaft is configured as a T-shaped rod-shaped body having a first arc-shaped piece, a second arc-shaped piece and a third arc-shaped piece, and the rod portion of the stop shaft is respectively configured to be connected in series with the faucet tube and the return spring, the rear end face portion of the first arc-shaped piece, the rear end face portion of the second arc-shaped piece and the rear end face portion of the third arc-shaped piece are configured to be contact-connected with the return spring, and the front end face portion of the first arc-shaped piece, the front end face portion of the second arc-shaped piece and the front end face portion of the third arc-shaped piece are configured to be contact-connected with the male joint, the first arc-shaped piece, the second arc-shaped piece and the third arc-shaped piece are respectively configured to be fan-shaped pieces, and the first arc-shaped piece, the second arc-shaped piece and the third arc-shaped piece are configured to be spaced and distributed along the peripheral line of the rod portion of the stop shaft.

[0036] The technical effects of the above four technical solutions are: realizing the setting of the jet water flow pressure of the central axis, and realizing the corresponding setting of the elastic energy storage and the jet water flow pressure.

[0037] The present invention designs that the filter screen is arranged as a circular filter screen piece and the filter screen is arranged to be embeddedly connected with the cylinder shell.

[0038] The technical effect of the above technical solution is that the jet water flow can be purified.

[0039] The present invention designs that the nut plug is configured as a circular cylindrical body having a first blind hole body and a second blind hole body on the rear end surface portion and the nut plug is configured to be threadedly connected to the central axis, and the first blind hole body and the second blind hole body are respectively configured as circular hole bodies.

[0040] The technical effect of the above technical solution is that: the injection into the central axis is realized through multiple channels, thereby reducing the impact on the cylinder shell.

[0041] The present invention is designed that the female joint, the cylinder shell and the one-way valve are arranged to be distributed with the middle axis and the cutting knife in the manner of extending the side cutting piece, and the female joint, the cylinder shell, the one-way valve, the middle axis and the cutting knife are arranged to be distributed with the rear bushing and the front bushing in the manner of sliding support, the female joint, the cylinder shell, the one-way valve, the middle axis and the cutting knife are arranged to be distributed with the faucet tube, the male joint, the return spring and the stop shaft in the manner of controlling the opening and closing of the high-pressure water flow, and the female joint, the cylinder shell, the one-way valve, the middle axis and the cutting knife are arranged to be distributed with the filter screen and the nut plug in the manner of controlling the injection of the high-pressure water flow, the center line of the female joint, the center line of the cylinder shell, the center line of the filter screen, the rear The center line of the bushing, the center line of the central axis, the center line of the nut plug, the center line of the front bushing, the center line of the faucet barrel, the center line of the male joint, the center line of the return spring, the center line of the stop shaft and the center line of the one-way valve are arranged on the same straight line, at least two cutting knives are arranged between the cylinder shell and the central axis, the valve seat is arranged to be connected to the front accommodating cavity, the valve core, the first arc piece, the second arc piece and the third arc piece are respectively arranged to be connected to the middle hole body of the partition part between the front accommodating cavity and the rear accommodating cavity, the tooth body is arranged to be connected to the rack body, and the knife parts are respectively arranged to be connected to the first leakage hole body and the second leakage hole body through the pin shaft.

[0042] The present invention designs a hole expansion method for underground coal mine tunnels, the steps of which are: the integrated installation of the cutter and the central axis is realized by the cylinder shell, the inner wall of the gas extraction hole or the inner wall of the coal seam pressure relief hole is cut and expanded by the cutter and the central axis, and crack gaps are generated on the peripheral side of the hole body.

[0043] The present invention is designed, and its steps are: when expanding the gas extraction hole or the coal seam pressure relief hole, the female joint is connected to the drill rod of the drilling rig, the barrel is placed in the gas extraction hole or the coal seam pressure relief hole, the drilling rig is in a working state, the barrel is driven by the drill rod to rotate, the high-pressure water flow is injected into the barrel through the female joint, the high-pressure water flow is injected into the through-hole body through the nut plug, and is sprayed out from the water spray hole body, and at the same time, the high-pressure water flow sprayed from the water spray hole body corresponding to the knife part acts on the buffer strip part, so that the knife part rotates outward in the first leakage hole body and the second leakage hole body, and the tooth body and the rack body are meshed and rotated, so that the shaft part is pushed to move forward in the rear bushing and the front bushing, and the faucet barrel is driven to move forward, and the elastic energy storage of the return spring is overcome, so that the return spring is in a compressed state, and the faucet barrel is connected to the stop shaft to seal the through-hole body, The knife portion is in an expanded state, and the cylinder portion drives the shaft portion and the knife portion to rotate. The high-pressure water flow sprayed by the water jet hole body and the knife portion cut the inner wall of the gas extraction hole or the coal seam pressure relief hole. Under the action of the thrust spring, the valve core seals the middle hole body of the partition portion between the front accommodating chamber and the rear accommodating chamber. After the expansion of the gas extraction hole or the coal seam pressure relief hole is completed, the drilling rig is placed in a non-working state, so that the high-pressure water flow is no longer injected into the cylinder portion through the female joint. Under the elastic energy storage action of the return spring, the return spring is placed in an extended state, pushing the shaft portion to move backward in the rear bushing and the front bushing, and rotating in the opposite direction through the meshing of the tooth body and the rack body, so that the knife portion rotates inward in the first leakage hole body and the second leakage hole body, so that the knife portion is in a retracted state, and the cylinder portion is taken out of the gas extraction hole or the coal seam pressure relief hole.

[0044] The technical effect of the above two technical solutions is that during the hole expansion process, forced cutting and impact on the hole wall are achieved to form an irregular pressure relief hole.

[0045] In the present technical scheme, the cylinder shell, the central axis and the cutting knife are basic components and are also the necessary technical features of the present invention; the female joint, the filter screen, the rear bushing, the nut plug, the front bushing, the faucet barrel, the male joint, the return spring, the stop shaft and the one-way valve are functional components and are the features for realizing other technical effects of the present invention; the designs of the technical features of the cylinder part, the rear accommodating hole body, the rear threaded hole body, the front accommodating hole body, the front threaded hole body, the first leakage hole body, the second leakage hole body, the shaft part, the rack body, the through hole body, the water spray hole body, the connecting threaded hole body, the connecting accommodating hole body, the knife part, the buffer strip part, the tooth body, the first blind hole body, the second blind hole body, the head part, the front accommodating cavity, the rear accommodating cavity, the first arc piece, the second arc piece, the third arc piece, the valve core, the thrust spring and the valve seat are technical features that comply with the Patent Law and its implementing rules.

[0046] In the present technical scheme, the cylinder shell, cutting knife and central axis that produce crack gaps on the inner wall of the gas extraction hole or the inner wall of the coal seam pressure relief hole are important technical features. In the technical field of hole expansion devices and methods for underground coal mine tunnels, it has novelty, creativity and practicality. The terms in the present technical scheme can be explained and understood using patent documents in this technical field. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0048] Figure 1 is a schematic diagram of the present invention,

[0049] Figure 2 is a schematic diagram of the structure of the cylinder shell 2,

[0050] Figure 3 for Figure 2 A top view of

[0051] Figure 4 for Figure 2 The right view of

[0052] Figure 5 is a schematic diagram of the structure of the central axis 5,

[0053] Figure 6 for Figure 5 Right view of

[0054] Figure 7 is a schematic diagram of the structure of the cutting knife 6,

[0055] Figure 8 for Figure 7 A top view of

[0056] Fig. 9 is a schematic diagram of the connection relationship between the blade portion 61 and the buffer strip portion 62,

[0057] Fig.10 is a schematic diagram of the structure of the nut plug 7,

[0058] Fig.11 is a schematic diagram of the structure of the male connector 91,

[0059] Fig.12 This is a schematic diagram of the structure of the through shaft 93.

[0060] Fig.13 for Fig.12 The main view,

[0061] Female connector-1, shell-2, filter screen-3, rear bushing-4, middle shaft-5, cutter-6, nut plug-7, front bushing-8, faucet tube-9, male connector-91, return spring-92, stop shaft-93, one-way valve-94,

[0062] Cylinder portion-21, rear accommodating hole body-22, rear threaded hole body-23, front accommodating hole body-24, front threaded hole body-25, first leakage hole body-26, second leakage hole body-27, shaft portion-51, rack body-52, through hole body-53, water spray hole body-54, connecting threaded hole body-55, connecting accommodating hole body-56, knife portion-61, buffer strip portion-62, tooth body-63, first blind hole body-71, second blind hole body-72, head portion-911, front accommodating cavity body-912, rear accommodating cavity body-913, first arc-shaped piece-931, second arc-shaped piece-932, third arc-shaped piece-933, valve core-941, thrust spring-942, valve seat-943. DETAILED DESCRIPTION

[0063] According to the Examination Guidelines, terms such as “having”, “including” and “comprising” used in the present invention should be understood as not dispensing with the existence or addition of one or more other elements or combinations thereof.

[0064] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0065] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0066] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. In addition, unless otherwise specified, the equipment and materials used in the following examples are commercially available. If the processing conditions are not clearly stated, please refer to the purchased product manual or proceed according to conventional methods in the art.

[0067] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0068] A hole expansion device for underground coal mine tunnels, Figure 1 This is the first embodiment of the present invention, which is specifically described in conjunction with the accompanying drawings. It includes a female joint 1, a cylinder shell 2, a filter screen 3, a rear bushing 4, a central axis 5, a cutter 6, a nut plug 7, a front bushing 8, a faucet tube 9, a male joint 91, a return spring 92, a stop shaft 93 and a one-way valve 94, and the female joint 1, the rear bushing 4, the front bushing 8 and the male joint 91 are respectively arranged on the cylinder shell 2, the central axis 5 is arranged between the rear bushing 4 and the front bushing 8, and the cutter 6 is arranged between the central axis 5 and the cylinder shell 2, the filter screen 3 is arranged on the female joint 1, and the nut plug 7 and the faucet tube 9 are arranged on the central axis 5, the stop shaft 93 is arranged between the male joint 91 and the central axis 5, and the return spring 92 is arranged between the stop shaft 93 and the central axis 5, and the one-way valve 94 is arranged on the male joint 91.

[0069] In this embodiment, the female connector 1 is configured as a circular cylindrical body and the inner end threaded body of the female connector 1 is configured to be connected to the cylinder shell 2, the inner end open part of the female connector 1 is configured to be accommodatingly connected to the filter screen 3 and the outer end open part threaded body of the female connector 1 is configured to be connected to the drill pipe.

[0070] A supporting connection point for the cylinder shell 2 and the filter screen 3 is formed through the female joint 1. The female joint 1 realizes the connection with the cylinder shell 2 and the filter screen 3. Its technical purpose is to be used as a component for connecting to the drill rod of a drilling rig.

[0071] In this embodiment, the filter screen 3 is configured as a circular filter screen piece and the filter screen 3 is configured to be embeddedly connected with the cartridge housing 2 .

[0072] A supporting connection point for the cartridge shell 2 is formed by the filter screen 3 , and the connection with the cartridge shell 2 is realized by the filter screen 3 . The technical purpose of the filter screen 3 is to be used as a component for filtering the high-pressure water flow injected into the central axis 5 .

[0073] In the present embodiment, a rear receiving hole body 22 and a rear threaded hole body 23 are respectively provided at the rear end head of the barrel portion 21 of the barrel shell 2, and a front receiving hole body 24 and a front threaded hole body 25 are respectively provided at the front end head of the barrel portion 21, a first leakage hole body 26 and a second leakage hole body 27 are respectively provided in the middle part of the peripheral side surface of the barrel portion 21, and the first leakage hole body 26 and the second leakage hole body 27 are respectively arranged to be connected to the cutter 6 in a receiving manner, the rear receiving hole body 22 is arranged to be connected to the rear bushing 4 and the rear threaded hole body 23 is arranged to be threadedly connected to the female joint 1, the front receiving hole body 24 is arranged to be connected to the front bushing 8 and the front threaded hole body 25 is arranged to be threadedly connected to the male joint 91, the barrel portion 21 is arranged to be a circular tubular body and ...6 and the second leakage hole body 27 are respectively arranged to be connected to the female joint 1, and the rear receiving hole body 22 and the rear threaded hole body 23 are arranged to be threadedly connected to the female joint 1, and the front receiving hole body 24 and the rear threaded hole body 25 are arranged to be threadedly connected to the male joint 91. The hole body 22, the rear threaded hole body 23, the front receiving hole body 24 and the front threaded hole body 25 are respectively arranged as circular hole bodies, the rear receiving hole body 22 and the rear threaded hole body 23 are arranged to be distributed in a convex shape, and the front receiving hole body 24 and the front threaded hole body 25 are arranged to be distributed in a convex shape, the first leakage hole body 26 and the second leakage hole body 27 are arranged to be arranged in an interval along the peripheral side surface of the cylinder 21, and rotating hole bodies are respectively arranged at the rear end portion of the inner wall of the first leakage hole body 26 and the rear end portion of the inner wall of the second leakage hole body 27, and the rotating hole body of the first leakage hole body 26 and the rotating hole body of the second leakage hole body 27 are respectively arranged to be connected to the pin shaft located on the cutting knife 6.

[0074] Through the barrel shell 2, supporting connection points for the female joint 1, the rear bushing 4, the cutting knife 6, the front bushing 8 and the male joint 91 are formed. The connection with the female joint 1 is realized by the barrel portion 21 and the rear threaded hole body 23. The connection with the rear bushing 4 is realized by the barrel portion 21 and the rear receiving hole body 22. The connection with the cutting knife 6 is realized by the barrel portion 21, the first leakage hole body 26 and the second leakage hole body 27. The connection with the front bushing 8 is realized by the barrel portion 21 and the front receiving hole body 24. The connection with the male joint 91 is realized by the barrel portion 21 and the front threaded hole body 25. The technical purpose is to serve as a supporting carrier for the female joint 1, the rear bushing 4, the cutting knife 6, the front bushing 8 and the male joint 91.

[0075] In this embodiment, the rear bushing 4 is set as an I-shaped cylindrical body and the rear bushing 4 is set to be embedded in the cylinder shell 2, the rear bushing 4 is set to be sleeved in the middle shaft 5 and the front end surface of the rear bushing 4 is set to be contact-connected with the cylinder shell 2, and the rear end surface of the rear bushing 4 is set to be contact-connected with the female joint 1.

[0076] A supporting connection point for the female joint 1, the cylinder shell 2 and the central axis 5 is formed through the rear bushing 4. The rear bushing 4 realizes connection with the female joint 1, connection with the cylinder shell 2 and connection with the central axis 5. Its technical purpose is to serve as a component for sliding support of the rear end head of the central axis 5.

[0077] In this embodiment, the front bushing 8 is set as an I-shaped cylindrical body and the front bushing 8 is set to be embedded in the cylinder shell 2, the front bushing 8 is set to be inserted into the middle shaft 5 and the rear end surface of the front bushing 8 is set to be in contact with the cylinder shell 2, and the front end surface of the front bushing 8 is set to be in contact with the male joint 91.

[0078] A supporting connection point for the male joint 91, the cylinder shell 2 and the center axis 5 is formed through the front bushing 8. The front bushing 8 realizes the connection with the male joint 91, the connection with the cylinder shell 2 and the connection with the center axis 5. Its technical purpose is to serve as a component for slidingly supporting the front end head of the center axis 5.

[0079] In this embodiment, a rack body 52 is provided at the rear side of the shaft portion 51 of the middle shaft 5 and a through hole body 53 is provided in the shaft portion 51, a water spray hole body 54 is provided on the rear side of the shaft portion 51 and a connecting threaded hole body 55 is provided at the rear end head of the shaft portion 51, a connecting accommodating hole body 56 is provided at the front end head of the shaft portion 51 and the rack body 52 is provided to be meshedly connected with the cutter 6, the rear end head of the shaft portion 51 is provided to be serially connected with the rear bushing 4 and the front end head of the shaft portion 51 is provided to be serially connected with the front bushing 8, The water spray hole body 54 is arranged to be distributed corresponding to the cutting knife 6 and the connecting threaded hole body 55 is arranged to be connected to the nut plug 7, the connecting accommodating hole body 56 is arranged to be connected to the water nozzle barrel 9 and the shaft portion 51 is arranged to be a circular rod-shaped body, the rack body 52 is arranged to be a straight rack and the through hole body 53, the water spray hole body 54, the connecting threaded hole body 55 and the connecting accommodating hole body 56 are arranged to be circular hole-shaped bodies, the water spray hole body 54 is arranged to be connected to the through hole body 53 and the water spray hole body 54 is arranged to be arranged and distributed at intervals along the transverse center line of the shaft portion 51.

[0080] Through the central axis 5, a supporting connection point for the rear bushing 4, the cutter 6, the nut plug 7, the front bushing 8 and the faucet tube 9 is formed. The shaft 51 realizes the connection with the rear bushing 4 and the front bushing 8. The rack body 52 and the water spray hole body 54 realize the connection with the cutter 6. The connecting threaded hole body 55 realizes the connection with the nut plug 7. The connecting accommodating hole body 56 realizes the connection with the faucet tube 9. The through hole body 53 realizes the channel processing of high-pressure water flow. The technical purpose is to be used as a component for spraying high-pressure water flow.

[0081] In this embodiment, the cutting knife 6 is configured to include a knife portion 61 and a buffer strip portion 62, and the outer end of the knife portion 61 is configured to be connected to the buffer strip portion 62, a tooth body 63 is provided on the rear end arc side portion of the knife portion 61, and the rear end of the knife portion 61 is configured to be connected to the cylinder shell 2 through a pin shaft, the tooth body 63 is configured to be meshingly connected to the central axis 5, and the buffer strip portion 62 is configured to be contactingly connected to the central axis 5, the knife portion 61 is configured to be a strip body and the buffer strip portion 62 is configured to be a rubber corrugated strip, the tooth body 63 is configured to be a straight tooth body, and the tooth body 63 is configured to be arranged and distributed at intervals along the rear end arc side portion of the knife portion 61.

[0082] The cutting knife 6 forms a supporting connection point between the cylinder shell 2 and the central axis 5. The knife portion 61 realizes the connection with the cylinder shell 2. The tooth body 63 and the buffer strip portion 62 realize the connection with the central axis 5. The technical purpose is to be used as a component for expanding the gas extraction hole or the coal seam pressure relief hole.

[0083] In this embodiment, the nut plug 7 is configured as a circular cylindrical body having a first blind hole body 71 and a second blind hole body 72 on the rear end surface, and the nut plug 7 is configured to be threadedly connected to the central axis 5, and the first blind hole body 71 and the second blind hole body 72 are respectively configured as circular hole bodies.

[0084] A supporting connection point for the center axis 5 is formed by the nut plug 7, and the connection with the center axis 5 is realized by the nut plug 7. The connection with the wrench is realized by the first blind hole body 71 and the second blind hole body 72. Its technical purpose is to be used as a component for controlling and adjusting the flow rate of high-pressure water injected into the center axis 5.

[0085] In this embodiment, the faucet barrel 9 is configured as a round rod-shaped body with a middle hole and the faucet barrel 9 is configured to be embeddedly connected to the central axis 5, the middle hole of the faucet barrel 9 is configured to be sleeve-connected to the stop shaft 93 and the front end surface portion of the faucet barrel 9 is configured to be contact-connected to the return spring 92.

[0086] Through the faucet barrel 9, a supporting connection point for the center axis 5, the return spring 92 and the stop shaft 93 is formed. The faucet barrel 9 realizes the connection with the center axis 5, the connection with the return spring 92, and the connection with the stop shaft 93. Its technical purpose is to serve as an outflow component for the high-pressure water flow in the center axis 5.

[0087] In the present embodiment, a rear accommodating chamber 913 is provided at the rear end head of the head 911 of the male connector 91 and a front accommodating chamber 912 is provided at the front end head of the head 911, the rear end head of the head 91 is configured to be connected to the cylinder shell 2 and the rear accommodating chamber 913 is configured to be accommodatingly connected to the return spring 92 and the stop shaft 93, the front accommodating chamber 912 is configured to be accommodatingly connected to the one-way valve 94 and the middle hole body of the partition portion between the front accommodating chamber 912 and the rear accommodating chamber 913 is configured to be contactingly connected to the stop shaft 93, the head 911 is configured to be a circular cylindrical body and the front accommodating chamber 912 is configured to be a circular hole body, and the rear accommodating chamber 913 is configured to be a convex hole body.

[0088] Through the male connector 91, a supporting connection point for the cylinder shell 2, the return spring 92, the stop shaft 93 and the one-way valve 94 is formed. The connection with the cylinder shell 2 is realized by the head 911, the connection with the return spring 92 is realized by the rear accommodating chamber 913, the connection with the stop shaft 93 is realized, and the connection with the one-way valve 94 is realized by the front accommodating chamber 912. The technical purpose is to serve as a supporting carrier for the return spring 92, the stop shaft 93 and the one-way valve 94.

[0089] In this embodiment, the return spring 92 is configured as a columnar spring and the return spring 92 is configured to be sleeved and connected to the stop shaft 93, one end of the return spring 92 is configured to be contact-connected to the stop shaft 93 and the other end of the return spring 92 is configured to be contact-connected to the faucet barrel 9.

[0090] A supporting connection point for the faucet barrel 9 and the stop shaft 93 is formed by the return spring 92. The return spring 92 realizes the connection with the faucet barrel 9 and the stop shaft 93. Its technical purpose is to serve as an elastic component for connecting the stop shaft 93 and the faucet barrel 9.

[0091] In this embodiment, the stop shaft 93 is configured as a T-shaped rod-shaped body having a first arc piece 931, a second arc piece 932 and a third arc piece 933, and the rod portion of the stop shaft 93 is respectively configured to be connected in series with the faucet tube 9 and the return spring 92, the rear end face portion of the first arc piece 931, the rear end face portion of the second arc piece 932 and the rear end face portion of the third arc piece 933 are configured to be contact-connected with the return spring 92, and the front end face portion of the first arc piece 931, the front end face portion of the second arc piece 932 and the front end face portion of the third arc piece 933 are configured to be contact-connected with the male joint 9, the first arc piece 931, the second arc piece 932 and the third arc piece 933 are respectively configured to be fan-shaped pieces, and the first arc piece 931, the second arc piece 932 and the third arc piece 933 are configured to be spaced apart and distributed along the peripheral line of the rod portion of the stop shaft 93.

[0092] A support connection point for the faucet barrel 9, the return spring 92 and the male connector 9 is formed by the stop shaft 93. The connection with the faucet barrel 9 is realized by the stop shaft 93. The connection with the return spring 92 and the male connector 9 are realized by the first arc piece 931, the second arc piece 932 and the third arc piece 933. The technical purpose is to be used as a component for controlling the opening and closing of the faucet barrel 9.

[0093] In this embodiment, the one-way valve 94 is configured to include a valve core 941, a thrust spring 942 and a valve seat 943, and the valve core 941 is configured to be connected in series with the thrust spring 942 and the valve seat 943 respectively, one of the ends of the thrust spring 942 is configured to be contact-connected with the front end surface portion of the valve core 941 and the other end of the thrust spring 942 is configured to be contact-connected with the rear end surface portion of the valve seat 943, the valve core 941 is configured to be contact-connected with the male connector 91 and the valve seat 943 is configured to be threadedly connected with the male connector 91, the valve core 941 is configured to be a T-shaped rod-shaped body and the thrust spring 942 is configured to be a columnar spring, and the valve seat 943 is configured to be a disc-shaped body with an accommodating annular groove on the rear end surface portion.

[0094] A supporting connection point for the male connector 9 is formed by the one-way valve 94, and the connection with the male connector 9 is realized by the valve core 941 and the valve seat 943. The elastic thrust processing is realized between the valve core 941 and the valve seat 943 by the thrust spring 942. The technical purpose is to serve as a component for end sealing of the male connector 9.

[0095] In this embodiment, the female connector 1, the cylinder shell 2 and the one-way valve 94 are arranged to be distributed with the central axis 5 and the cutting knife 6 in the manner of extending the side cutting piece, and the female connector 1, the cylinder shell 2, the one-way valve 94, the central axis 5 and the cutting knife 6 are arranged to be distributed with the rear bushing 4 and the front bushing 8 in the manner of sliding support, the female connector 1, the cylinder shell 2, the one-way valve 94, the central axis 5 and the cutting knife 6 are arranged to be distributed with the faucet tube 9, the male connector 91, the return spring 92 and the stop shaft 93 in the manner of controlling the opening and closing of the high-pressure water flow, and the female connector 1, the cylinder shell 2, the one-way valve 94, the central axis 5 and the cutting knife 6 are arranged to be distributed with the filter screen 3 and the nut plug 7 in the manner of controlling the injection of the high-pressure water flow, the center line of the female connector 1, the center line of the cylinder shell 2, the center line of the filter screen 3, the center line of the rear bushing 4 The center line, the center line of the central axis 5, the center line of the nut plug 7, the center line of the front bushing 8, the center line of the faucet tube 9, the center line of the male joint 91, the center line of the return spring 92, the center line of the stop shaft 93 and the center line of the one-way valve 94 are arranged on the same straight line, at least two cutting knives 6 are arranged between the cylinder shell 2 and the central axis 5, the valve seat 943 is arranged to be connected to the front accommodating cavity 912, the valve core 941, the first arc piece 931, the second arc piece 932 and the third arc piece 933 are respectively arranged to be connected to the middle hole body of the partition part between the front accommodating cavity 912 and the rear accommodating cavity 913, the tooth body 63 is arranged to be connected to the rack body 52, and the knife part 61 is respectively arranged to be connected to the first leakage hole body 26 and the second leakage hole body 27 through the pin shaft.

[0096] The present invention is further described below in conjunction with examples. The following examples are intended to illustrate the present invention rather than to further limit the present invention.

[0097] A method for expanding a hole in an underground coal mine tunnel, the steps of which are: when expanding a gas extraction hole or a coal seam pressure relief hole, a female connector 1 is connected to a drill rod of a drilling rig, a barrel 21 is placed in the gas extraction hole or the coal seam pressure relief hole, the drilling rig is put into a working state, the barrel 21 is driven by the drill rod to rotate, a high-pressure water flow is injected into the barrel 21 through the female connector 1, the high-pressure water flow is injected into the through hole body 53 through the nut plug 7, and is sprayed out from the water spray hole body 54, and at the same time, the water spray hole 54 is sprayed out by the water spray hole body 54 connected to the knife part 61. The high-pressure water flow ejected by the corresponding water spray hole body 54 acts on the buffer strip part 62, causing the knife part 61 to rotate outward in the first leakage hole body 26 and the second leakage hole body 27, and the tooth body 63 is meshed and rotated with the rack body 52, pushing the shaft part 51 to move forward in the rear bushing 4 and the front bushing 8, driving the faucet tube 9 to move forward, overcoming the elastic energy storage of the return spring 92, making the return spring 92 in a compressed state, and the faucet tube 9 is connected to the stop shaft 93, sealing the through hole body 53. The knife part 61 is in the expanded state, the cylinder part 21 drives the shaft part 51 and the knife part 61 to rotate, and the high-pressure water flow sprayed by the water spray hole body 54 and the knife part 61 cut the inner wall of the gas extraction hole or the coal seam pressure relief hole. Under the action of the thrust spring 942, the valve core 941 seals the middle hole of the partition part between the front accommodating chamber 912 and the rear accommodating chamber 913. When the expansion of the gas extraction hole or the coal seam pressure relief hole is completed, the drilling rig is in a non-working state. , so that the high-pressure water flow is no longer injected into the barrel 21 through the female connector 1. Under the elastic energy storage action of the return spring 92, the return spring 92 is in an extended state, pushing the shaft 51 to move backward in the rear bushing 4 and the front bushing 8, and the tooth body 63 and the rack body 52 are engaged and rotated in the opposite direction, so that the knife portion 61 rotates inward in the first leakage hole body 26 and the second leakage hole body 27, so that the knife portion 61 is in a retracted state, and the barrel 21 is taken out from the gas extraction hole or the coal seam pressure relief hole.

[0098] In the second embodiment of the present invention, the shell 2, the cutter 6 and the center axis 5 are connected to each other in such a way that crack gaps are generated on the inner wall of the gas extraction hole or the inner wall of the coal seam pressure relief hole.

[0099] In this embodiment, the cutter 6 and the center axis 5 are connected to the shell 2 in such a way that crack gaps are generated on the inner wall of the gas extraction hole or the inner wall of the coal seam pressure relief hole through scratching and water flow impact.

[0100] In this embodiment, a first accessory device is also included and is arranged on the cartridge shell 2 . The first accessory device is arranged to include a female connector 1 and a one-way valve 94 .

[0101] In this embodiment, a second accessory device is further included and is disposed between the middle shaft 5 and the cylindrical shell 2 . The second accessory device is configured to include a rear bushing 4 and a front bushing 8 .

[0102] In this embodiment, a third accessory device is also included and is arranged between the central axis 5 and the cylinder shell 2 . The third accessory device is arranged to include a faucet barrel 9 , a male connector 91 , a return spring 92 and a stop shaft 93 .

[0103] In this embodiment, a fourth accessory device is further included and is arranged on the first accessory device. The fourth accessory device is arranged as a filter net 3 .

[0104] In this embodiment, a fifth accessory device is further included and is arranged on the central shaft 5 . The fifth accessory device is arranged as a nut plug 7 .

[0105] The second embodiment of the present invention is based on the first embodiment.

[0106] The second embodiment of the present invention comprises the following steps: the cylinder shell 2 realizes the integrated installation of the cutter 6 and the central axis 5, and the cutter 6 and the central axis 5 realize the cutting and expansion of the inner wall of the gas extraction hole or the inner wall of the coal seam pressure relief hole, thereby realizing the generation of crack gaps on the peripheral side of the hole body.

[0107] The second embodiment of the present invention is based on the first embodiment.

[0108] The present invention has the following characteristics:

[0109] 1. Due to the design of the cylinder shell 2, the cutter 6 and the central axis 5, the integrated installation of the cutter 6 and the central axis 5 is realized through the cylinder shell 2, and the inner wall of the gas extraction hole or the inner wall of the coal seam pressure relief hole is cut and expanded through the cutter 6 and the central axis 5, and crack gaps are generated on the peripheral side of the hole body, thereby improving the treatment effect of gas extraction or coal seam pressure relief.

[0110] 2. The female connector 1 and the one-way valve 94 are designed for end connection.

[0111] 3. The rear bushing 4 and the front bushing 8 are designed to serve as sliding supports for the middle shaft 5.

[0112] 4. Due to the design of the faucet tube 9, the male joint 91, the return spring 92 and the stop shaft 93, a motion force is generated on the cutting knife 6 and the middle shaft 5.

[0113] 5. Due to the design of the filter 3, the high-pressure water flow can be purified.

[0114] 6. Due to the design of the nut plug 7, flow limiting processing of high-pressure water flow is achieved.

[0115] 7. Since the design limits the numerical range of the structural shape, the numerical range is the technical feature in the technical solution of the present invention, rather than a technical feature calculated by a formula or obtained through a limited number of tests. Tests have shown that the technical feature of this numerical range has achieved good technical effects.

[0116] 8. Due to the design of the technical features of the present invention, the effects of the individual and combined technical features have been shown through experiments to have various performance indicators of the present invention that are at least 1.7 times the existing performance indicators, and have been evaluated to have good market value.

[0117] There are other technical features of the connection between the shell 2, the cutter 6 and the central axis 5 that produce crack gaps on the inner wall of the gas extraction hole or the inner wall of the coal seam pressure relief hole, which are all embodiments of the present invention, and the technical features of the above-mentioned embodiments can be combined arbitrarily. In order to meet the requirements of the Patent Law, the Patent Implementation Rules and the Examination Guidelines, all possible combinations of the technical features in the above-mentioned embodiments will no longer be described.

[0118] The above embodiment is only one implementation form of the hole expansion device and method for underground coal mine tunnels provided by the present invention. Other variations of the scheme provided by the present invention, adding or reducing components or steps therein, or applying the present invention to other technical fields close to the present invention, all fall within the scope of protection of the present invention.

Claims

1. A hole enlarging device for underground coal mine tunnels, characterized in that: The invention comprises a cylindrical shell (2) used as a shell support, a cutting knife (6) arranged on the cylindrical shell (2), and a central axis (5) arranged between the cutting knife (6) and the cylindrical shell (2). The shell (2), the cutter (6) and the center shaft (5) are connected to each other in a manner that crack gaps are generated on the inner wall of the gas extraction hole or the inner wall of the coal seam pressure relief hole. The cutter (6) and the center shaft (5) are connected to the shell (2) in such a way that crack gaps are generated on the inner wall of the gas extraction hole or the inner wall of the coal seam pressure relief hole by means of scratching and water flow impact. It also includes a first accessory device and the first accessory device is arranged on the cartridge shell (2), the first accessory device being arranged to include a female connector (1) and a one-way valve (94). It also includes a second accessory device and the second accessory device is arranged between the middle shaft (5) and the barrel shell (2), and the second accessory device is arranged to include a rear bushing (4) and a front bushing (8). The invention also comprises a third accessory device and the third accessory device is arranged between the middle shaft (5) and the barrel shell (2), and the third accessory device is arranged to include a faucet barrel (9), a male joint (91), a return spring (92) and a stop shaft (93). It also includes a fourth accessory device, and the fourth accessory device is arranged on the first accessory device, and the fourth accessory device is arranged as a filter net (3). It also includes a fifth accessory device and the fifth accessory device is arranged on the middle shaft (5), and the fifth accessory device is arranged as a nut plug (7). A female joint (1), a rear bushing (4), a front bushing (8) and a male joint (91) are respectively arranged on the cylinder shell (2); a central shaft (5) is arranged between the rear bushing (4) and the front bushing (8), and a cutter (6) is arranged between the central shaft (5) and the cylinder shell (2); a filter screen (3) is arranged on the female joint (1), and a nut plug (7) and a faucet tube (9) are arranged on the central shaft (5); a stop shaft (93) is arranged between the male joint (91) and the central shaft (5), and a return spring (92) is arranged between the stop shaft (93) and the central shaft (5); and a one-way valve (94) is arranged on the male joint (91). A rear receiving hole body (22) and a rear threaded hole body (23) are respectively arranged at the rear end head of the barrel portion (21) of the barrel shell (2), and a front receiving hole body (24) and a front threaded hole body (25) are respectively arranged at the front end head of the barrel portion (21), a first leakage hole body (26) and a second leakage hole body (27) are respectively arranged in the middle part of the peripheral side surface of the barrel portion (21), and the first leakage hole body (26) and the second leakage hole body (27) are respectively arranged to be received and connected to the cutter (6), the rear receiving hole body (22) is arranged to be connected to the rear bushing (4) and the rear threaded hole body (23) is arranged to be threadedly connected to the female joint (1), the front receiving hole body (24) is arranged to be connected to the front bushing (8) and the front threaded hole body (25) is arranged to be threadedly connected to the male joint (91), the barrel portion (21) is arranged to be a circular tubular body and the rear receiving hole body (26) and the second leakage hole body (27) are respectively arranged to be received and connected to the cutter (6), The hole body (22), the rear threaded hole body (23), the front receiving hole body (24) and the front threaded hole body (25) are respectively arranged as circular hole bodies, the rear receiving hole body (22) and the rear threaded hole body (23) are arranged to be distributed in a convex shape, and the front receiving hole body (24) and the front threaded hole body (25) are arranged to be distributed in a convex shape, the first leakage hole body (26) and the second leakage hole body (27) are arranged to be arranged at intervals along the peripheral side surface of the cylinder (21), the rear end portion of the inner wall of the first leakage hole body (26) and the rear end portion of the inner wall of the second leakage hole body (27) are respectively provided with rotating hole bodies, and the rotating hole body of the first leakage hole body (26) and the rotating hole body of the second leakage hole body (27) are respectively arranged to be connected to the pin shaft located on the cutting knife (6), A rack body (52) is arranged at the rear side of the shaft portion (51) of the middle shaft (5), and a through hole body (53) is arranged in the shaft portion (51), a water spray hole body (54) is arranged on the rear side of the shaft portion (51), and a connecting threaded hole body (55) is arranged at the rear end head of the shaft portion (51), a connecting accommodating hole body (56) is arranged at the front end head of the shaft portion (51), and the rack body (52) is arranged to be meshedly connected with the cutter (6), the rear end head of the shaft portion (51) is arranged to be serially connected with the rear bushing (4), and the front end head of the shaft portion (51) is arranged to be serially connected with the front bushing (8), and the water spray hole body (54) is arranged on the rear side of the shaft portion (51), and a connecting threaded hole body (55) is arranged at the rear end head of the shaft portion (51). The body (54) is arranged to be distributed corresponding to the cutting knife (6) and the connecting threaded hole body (55) is arranged to be connected to the nut plug (7), the connecting accommodating hole body (56) is arranged to be connected to the water nozzle barrel (9) and the shaft portion (51) is arranged to be a circular rod-shaped body, the rack body (52) is arranged to be a straight rack and the through hole body (53), the water spray hole body (54), the connecting threaded hole body (55) and the connecting accommodating hole body (56) are arranged to be circular hole-shaped bodies, the water spray hole body (54) is arranged to be connected to the through hole body (53) and the water spray hole bodies (54) are arranged to be arranged and distributed at intervals along the transverse center line of the shaft portion (51), The cutting knife (6) is configured to include a knife portion (61) and a buffer strip portion (62), and the outer end of the knife portion (61) is configured to be connected to the buffer strip portion (62), a tooth body (63) is configured on the rear end arc-shaped side portion of the knife portion (61), and the rear end of the knife portion (61) is configured to be connected to the cylinder shell (2) through a pin shaft, the tooth body (63) is configured to be meshingly connected to the middle axis (5), and the buffer strip portion (62) is configured to be contactingly connected to the middle axis (5), the knife portion (61) is configured to be a strip body, and the buffer strip portion (62) is configured to be a rubber corrugated strip, the tooth body (63) is configured to be a straight tooth body, and the tooth body (63) is configured to be arranged and distributed at intervals along the rear end arc-shaped side portion of the knife portion (61).

2. The hole enlarging device for underground coal mine tunnel according to claim 1 is characterized in that: The female connector (1) is configured as a circular cylindrical body and the inner end threaded body of the female connector (1) is configured to be connected to the cylindrical shell (2), the inner end open portion of the female connector (1) is configured to be accommodatingly connected to the filter screen (3) and the outer end open portion threaded body of the female connector (1) is configured to be connected to the drill rod.

3. The hole enlarging device for underground coal mine tunnel according to claim 1 is characterized in that: The one-way valve (94) is configured to include a valve core (941), a thrust spring (942) and a valve seat (943), and the valve core (941) is configured to be serially connected to the thrust spring (942) and the valve seat (943), respectively; one end of the thrust spring (942) is configured to be contact-connected to the front end surface of the valve core (941) and the other end of the thrust spring (942) is configured to be contact-connected to the rear end surface of the valve seat (943); the valve core (941) is configured to be contact-connected to the male connector (91) and the valve seat (943) is configured to be threadedly connected to the male connector (91); the valve core (941) is configured to be a T-shaped rod-shaped body and the thrust spring (942) is configured to be a columnar spring; and the valve seat (943) is configured to be a disc-shaped body having an accommodating annular groove on the rear end surface.

4. The hole enlarging device for underground coal mine tunnel according to claim 1 is characterized in that: The rear bushing (4) is configured as an I-shaped cylindrical body and is configured to be embeddedly connected to the cylinder shell (2), the rear bushing (4) is configured to be sleeve-type connected to the central shaft (5), and the front end surface portion of the rear bushing (4) is configured to be contact-type connected to the cylinder shell (2), and the rear end surface portion of the rear bushing (4) is configured to be contact-type connected to the female joint (1).

5. The hole enlarging device for underground coal mine tunnel according to claim 1 is characterized in that: The front bushing (8) is configured as an I-shaped cylindrical body and the front bushing (8) is configured to be embeddedly connected to the cylinder shell (2), the front bushing (8) is configured to be sleeve-type connected to the middle shaft (5), and the rear end surface portion of the front bushing (8) is configured to be contact-type connected to the cylinder shell (2), and the front end surface portion of the front bushing (8) is configured to be contact-type connected to the male joint (91).

6. The hole enlarging device for underground coal mine tunnels according to claim 1 is characterized in that: The faucet barrel (9) is configured as a round rod-shaped body having a middle hole and the faucet barrel (9) is configured to be embeddedly connected to the central axis (5), the middle hole of the faucet barrel (9) is configured to be sleeve-connected to a stop shaft (93), and the front end surface portion of the faucet barrel (9) is configured to be contact-connected to a return spring (92).

7. The hole enlarging device for underground coal mine tunnels according to claim 1 is characterized in that: The rear end of the head (911) of the male connector (91) is provided with a rear accommodating cavity (913) and the front end of the head (911) is provided with a front accommodating cavity (912); the rear end of the head (911) is provided to be connected to the cylinder shell (2) and the rear accommodating cavity (913) is provided to be accommodatingly connected to the return spring (92) and the stop shaft (93); the front accommodating cavity (912) is provided to be accommodatingly connected to the one-way valve (94) and the middle hole of the partition part between the front accommodating cavity (912) and the rear accommodating cavity (913) is provided to be contact-connected to the stop shaft (93); the head (911) is provided to be a circular cylindrical body and the front accommodating cavity (912) is provided to be a circular hole-shaped body, and the rear accommodating cavity (913) is provided to be a convex hole-shaped body.

8. The hole enlarging device for underground coal mine tunnel according to claim 1 is characterized in that: The return spring (92) is configured as a columnar spring and is configured to be sleeve-connected to a stop shaft (93), one end of the return spring (92) is configured to be contact-connected to the stop shaft (93) and the other end of the return spring (92) is configured to be contact-connected to a faucet barrel (9).

9. The hole enlarging device for underground coal mine tunnels according to claim 1, characterized in that: The stop shaft (93) is configured as a T-shaped rod-shaped body having a first arc-shaped piece (931), a second arc-shaped piece (932) and a third arc-shaped piece (933), and the rod portion of the stop shaft (93) is configured to be serially connected to the faucet tube (9) and the return spring (92), respectively, and the rear end face portion of the first arc-shaped piece (931), the rear end face portion of the second arc-shaped piece (932) and the rear end face portion of the third arc-shaped piece (933) are configured to be contact-connected to the return spring (92), and the first arc-shaped piece (931) is configured to be serially connected to the faucet tube (9) and the return spring (92), respectively. The front end face portion of the curved piece (931), the front end face portion of the second curved piece (932) and the front end face portion of the third curved piece (933) are arranged to be contact-connected with the male joint (91); the first curved piece (931), the second curved piece (932) and the third curved piece (933) are respectively arranged as fan-shaped pieces and the first curved piece (931), the second curved piece (932) and the third curved piece (933) are arranged to be spaced and distributed along the peripheral line of the rod portion of the stop shaft (93).

10. The hole enlarging device for underground coal mine tunnels according to claim 1, characterized in that: The filter screen (3) is configured as a circular filter screen sheet and the filter screen (3) is configured to be embeddedly connected with the cartridge case (2).

11. The hole enlarging device for underground coal mine tunnels according to claim 1, characterized in that: the nut The plug (7) is configured as a circular cylindrical body having a first blind hole body (71) and a second blind hole body (72) on the rear end surface portion, and the nut plug (7) is configured to be threadedly connected to the central axis (5), and the first blind hole body (71) and the second blind hole body (72) are respectively configured as circular hole bodies.

12. The hole enlarging device for underground coal mine tunnel according to any one of claims 1 to 11, characterized in that: The female joint (1), the shell (2), the one-way valve (94), the middle shaft (5), and the cutting knife (6) are arranged in a manner of extending the side cutting piece, and the female joint (1), the shell (2), the one-way valve (94), the middle shaft (5), and the cutting knife (6) are arranged in a manner of sliding support, the female joint (1), the shell (2), the one-way valve (94), the middle shaft (5), and the cutting knife (6) are arranged in a manner of controlling the opening and closing of the high-pressure water flow, and the female joint (1), the shell (2), the one-way valve (94), the middle shaft (5), and the cutting knife (6) are arranged in a manner of controlling the injection of the high-pressure water flow, and the center line of the female joint (1), the center line of the shell (2), the center line of the filtering net (3), the center line of the rear bushing (4), and the front bushing (8) are arranged in a manner of sliding support, the female joint (1), the shell (2), the one-way valve (94), the middle shaft (5), and the cutting knife (6) are arranged in a manner of controlling the opening and closing of the high-pressure water flow, and the female joint (1), the shell (2), the one-way valve (94), the middle shaft (5), and the cutting knife (6) are arranged in a manner of controlling the injection of the high-pressure water flow, and the center line of the female joint (1), the center line of the shell (2), the center line of the filtering net (3), the center line of the rear bushing ( The center line of the cylinder shell (2), the center line of the central axis (5), the center line of the nut plug (7), the center line of the front bushing (8), the center line of the faucet barrel (9), the center line of the male joint (91), the center line of the return spring (92), the center line of the stop shaft (93) and the center line of the one-way valve (94) are arranged on the same straight line, at least two cutting knives (6) are arranged between the cylinder shell (2) and the central axis (5), the valve seat (943) is arranged to be connected to the front accommodating cavity (912), the valve core (941), the first arc-shaped piece (931), the second arc-shaped piece (932) and the third arc-shaped piece (933) are respectively arranged to be connected to the middle hole body of the partition part between the front accommodating cavity (912) and the rear accommodating cavity (913), the tooth body (63) is arranged to be connected to the rack body (52), and the knife part (61) is respectively arranged to be connected to the first leakage hole body (26) and the second leakage hole body (27) through a pin shaft.

13. A hole enlarging device for underground coal mine tunnels according to claim 1, characterized in that the steps are: The cylindrical shell (2) realizes the integrated installation of the cutting knife (6) and the central axis (5), and the cutting knife (6) and the central axis (5) realize cutting and expanding the inner wall of the gas extraction hole or the inner wall of the coal seam pressure relief hole, thereby realizing the generation of crack gaps on the peripheral side of the hole body.

14. The hole enlarging method according to claim 13, characterized in that the steps are: When expanding the gas extraction hole or the coal seam pressure relief hole, the female joint (1) is connected to the drill rod of the drilling rig, the barrel (21) is placed in the gas extraction hole or the coal seam pressure relief hole, the drilling rig is put into operation, the barrel (21) is driven by the drill rod to rotate, and high-pressure water is injected into the barrel (21) through the female joint (1), and the high-pressure water is injected into the through-hole body (53) through the nut plug (7), and is sprayed out from the water spray hole body (54). At the same time, the high-pressure water sprayed from the water spray hole body (54) corresponding to the knife part (61) acts on the The buffer strip (62) is arranged on the first leakage hole body (26) and the second leakage hole body (27), so that the knife part (61) rotates outward in the first leakage hole body (26) and the second leakage hole body (27), and the tooth body (63) and the rack body (52) are meshed and rotated, so that the shaft part (51) is pushed to move forward in the rear bushing (4) and the front bushing (8), and the faucet tube (9) is driven to move forward, overcoming the elastic energy storage of the return spring (92), so that the return spring (92) is in a compressed state, and the faucet tube (9) is connected to the stop shaft (93), the through hole body (53) is sealed, and the knife part (61) is in a closed state. In the expanded state, the cylinder (21) drives the shaft (51) and the knife (61) to rotate, and the high-pressure water flow sprayed by the water spray hole (54) and the knife (61) cuts the inner wall of the gas extraction hole or the coal seam pressure relief hole. Under the action of the thrust spring (942), the valve core (941) seals the middle hole of the partition part between the front accommodating chamber (912) and the rear accommodating chamber (913). When the gas extraction hole or the coal seam pressure relief hole is expanded, the drilling rig is placed in a non-working state, so that the high-pressure water flow is no longer The energy is injected into the barrel (21) through the female joint (1), and the return spring (92) is in an extended state under the elastic energy storage effect of the return spring (92), pushing the shaft (51) to move backward in the rear bushing (4) and the front bushing (8), and the tooth body (63) and the rack body (52) are engaged and rotated in the opposite direction, so that the knife part (61) rotates inward in the first leakage hole body (26) and the second leakage hole body (27), so that the knife part (61) is in a retracted state, and the barrel (21) is taken out from the gas extraction hole or the coal seam pressure relief hole.

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