Reaming device for underground coal mine pressure relief hole

Abstract

The invention discloses a broaching device for an underground coal mine pressure relief hole, and relates to the technical field of broaching devices.The broaching device comprises a drill rod, a water conveying assembly and a broaching assembly, the water conveying assembly is connected to one end of the drill rod, and the broaching assembly is arranged at the other end of the drill rod and can rotate relative to a mounting part and comprises a barrel, a first pipe and a plurality of impact strips; a water sump and a plurality of slideways are arranged in the barrel, the first pipe is connected with the water sump, the other end of the first pipe extends out of the barrel, the slideways are connected with the water sump, and the impact strips are slidably assembled on the slideways in a sealed mode and reciprocate in the extending direction of the slideways respectively and are provided with jet flow channels connected with the water sump, and jet flow openings are formed in the impact ends of the impact strips. The impact strip is used for moving in the direction away from the cylinder body to impact the hole wall of the pressure relief hole when the reaming assembly rotates relative to the mounting part. According to the reaming device for the underground coal mine pressure relief hole, the reaming efficiency is high, the number of cracks on the peripheral side of the hole body after reaming is completed is increased, and the pressure relief capacity and the air permeability of the pressure relief hole are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of reaming devices, in particular to a reaming device for a pressure relief hole in an underground coal mine. BACKGROUND

[0002] In the process of coal mining, a pressure relief hole is drilled in a coal mine shaft. The pressure relief hole can release the pressure inside the coal body, reduce the stress level inside the coal seam, and prevent accidents such as coal seam cracking and floor water breaking caused by excessively high stress. In order to further increase the effect of the pressure relief hole, expand the pressure relief range, and improve the stability of the coal seam, reaming operation can be performed on the pressure relief hole. Reaming the pressure relief hole makes the diameter of the pressure relief hole larger. On the one hand, it allows the surrounding coal seam to release more stress. On the other hand, reaming the pressure relief hole can improve the permeability around the pressure relief hole, promote the leakage of gas in the coal seam to the outside through the pressure relief hole, improve the effect of gas extraction, and at the same time reduce the accumulation of gas and reduce the risk of gas explosion.

[0003] In related technologies, high-pressure water jet reaming equipment is often used for reaming the pressure relief hole. The commonly used high-pressure water jet reaming equipment is connected with a high-pressure water pump through a nozzle. A drill rod connected with the nozzle is driven by a driving device to extend into the pressure relief hole. The high-pressure nozzle is extended into the pressure relief hole. The high-pressure water rotates at high speed in the pressure relief hole through the nozzle to gradually disperse the coal body, so as to improve the permeability between the coal seams. However, there are problems such as few or no cracks around the hole body during the reaming process, low reaming efficiency, poor pressure relief effect of the pressure relief hole after reaming is completed, and low permeability. SUMMARY

[0004] The present application aims to at least partially solve one of the technical problems in the related art.

[0005] To this end, the present application provides a reaming device for a pressure relief hole in an underground coal mine. The reaming device for a pressure relief hole in an underground coal mine has high reaming efficiency, increases the number of cracks on the side of the hole body after reaming is completed, and improves the pressure relief capacity and permeability of the pressure relief hole.

[0006] The reaming device for a pressure relief hole in an underground coal mine according to the present application comprises: a drill rod, wherein the drill rod is provided with a mounting portion, and the mounting portion is used for mounting on a fixed platform or held by a person; a water delivery assembly connected to one end of the drill rod and used for delivering water into the drill rod; The reaming assembly is arranged at the other end of the drill rod and can rotate relative to the mounting part, and comprises a barrel, a first pipe and a plurality of impact strips, axial two ends of the barrel are respectively arranged in a sealed manner, a water chamber and a plurality of slides are arranged in the barrel, one end of the first pipe is connected with the water chamber and the other end of the first pipe extends out of the barrel to be used for conveying water to the water chamber, the slide is connected with the water chamber and extends along the axial direction of the barrel, the plurality of impact strips are respectively arranged in a sliding and sealed manner in the plurality of slides and reciprocally move along the extension direction of the slide, the impact strip is provided with a jet flow channel connected with the water chamber and is provided with a jet flow port at an impact end, and the impact strip is used for moving in a direction away from the barrel to impact the hole wall of the pressure relief hole when the reaming assembly rotates relative to the mounting part.

[0007] The reaming device for the pressure relief hole of the underground coal mine in the embodiment of the present application conveys water into the water chamber through the water conveying assembly, the drill rod and the first pipe, the water in the water chamber reaches the jet flow channel through the slide and is sprayed through the jet flow port, the sprayed water impacts the hole wall of the pressure relief hole, at the same time, when the reaming assembly rotates relative to the mounting part, the impact strip moves in a direction away from the barrel along a direction perpendicular to the axial direction of the barrel, the impact on the hole wall of the pressure relief hole is realized, the continuous impact on the hole wall is realized through the reciprocating movement of the impact strip in the slide, the reaming operation on the pressure relief hole is realized under the rotation of the reaming assembly relative to the mounting part, the reaming efficiency is high, the combined impact of the water and the impact strip on the hole wall of the pressure relief hole increases the number of cracks generated on the hole wall after the reaming is completed, and the pressure relief capacity and the air permeability of the pressure relief hole are improved.

[0008] In some embodiments, the barrel is provided with a first flow channel, a second flow channel and a third flow channel which are sequentially communicated, the first flow channel is connected with the water chamber, the adjusting unit for communicating the second flow channel under a set water pressure is arranged in the first flow channel, and the third flow channel is provided with a plurality of channels corresponding to the slides and is connected in parallel with the second flow channel.

[0009] In some embodiments, the adjusting unit comprises a sealing plug and a first spring, the sealing plug is arranged in the first flow channel in a sliding and sealed manner, the first spring is arranged in the first flow channel and is used for driving the sealing plug to move, the sealing plug has a first position and a second position, in the first position, the first spring has a first length, the sealing plug blocks the water inlet of the second flow channel, and in the second position, the first spring has a second length, and the sealing plug opens at least part of the water inlet of the second flow channel.

[0010] In some embodiments, the reaming assembly comprises a second spring arranged in the jet flow channel and extending along the extension direction of the jet flow channel, one end of the second spring is fixedly connected with the impact strip and the other end is fixedly connected with the bottom wall of the slide, and the second spring is used to drive the impact strip to move towards the bottom wall of the slide.

[0011] In some embodiments, a plurality of reaming assemblies are arranged in sequence along the axial direction of the drill rod and can be detachably connected, a second pipe is arranged through the cylinder body and extends out of the cylinder body at both ends, the two ends of the second pipe can be opened and blocked, one end of the cylinder body close to the drill rod is provided with a connecting cylinder segment, the connecting cylinder segment is used to connect with the adjacent drill rod or cylinder body and restrict a water cavity with the adjacent two cylinder bodies, and the second pipes on the two cylinder bodies of the adjacent two reaming assemblies are communicated through the water cavity.

[0012] In some embodiments, the impact strips on the two cylinder bodies of any adjacent two reaming assemblies are arranged in a staggered manner.

[0013] In some embodiments, the impact end of the impact strip is at least partially arc-shaped.

[0014] In some embodiments, a drill bit cone is detachably connected to the end of the plurality of reaming assemblies away from the drill rod.

[0015] In some embodiments, a rotating assembly is further included, the rotating assembly comprises a connecting pipe, an arc-shaped water nozzle and a paddle, the connecting pipe is fixedly connected with the drill rod and rotationally connected with the cylinder body, the arc-shaped water nozzle is arranged in the connecting pipe, and the paddle is fixedly arranged at one end of the cylinder body close to the connecting pipe and arranged in the connecting pipe, the arc-shaped water nozzle is used to adjust the water flow direction in the connecting pipe to drive the paddle to rotate.

[0016] In some embodiments, a driving assembly is further included, the drill rod is rotationally assembled with the mounting part, the driving assembly is drivingly connected with the drill rod and used to drive the drill rod to rotate relative to the mounting part.

[0017] In some embodiments, the driving assembly comprises a hydraulic motor and a hydraulic pump, the hydraulic motor comprises a body and a shaft, the body is fixedly connected with the mounting part, the shaft is a hollow shaft and is fixedly connected with the drill rod, the other end of the shaft is connected with the water delivery assembly, and the hydraulic pump is connected with the hydraulic motor to drive the hydraulic motor to rotate.

[0018] In some embodiments, the driving assembly comprises a driving motor, the driving motor is fixedly arranged relative to the mounting part, and the output end of the driving motor is drivingly engaged with the drill rod to drive the drill rod to rotate.

[0019] In some embodiments, the drill rod comprises at least two detachably connected rod segments, the rod segment at one end is connected with the water delivery assembly, and the rod segment at the other end is connected with the reaming assembly, and the mounting portion is arranged at the rod segment connected with the water delivery assembly. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structural schematic view of the reaming device for pressure relief hole of underground coal mine according to an embodiment of the present application.

[0021] Figure 2 is a connection schematic view of the reaming assembly in the reaming device for pressure relief hole of underground coal mine according to an embodiment of the present application.

[0022] Figure 3 is a first sectional view of the reaming assembly in the reaming device for pressure relief hole of underground coal mine according to an embodiment of the present application.

[0023] Figure 4 is a second sectional view of the reaming assembly in the reaming device for pressure relief hole of underground coal mine according to an embodiment of the present application.

[0024] Figure 5 is a third sectional view of the reaming assembly in the reaming device for pressure relief hole of underground coal mine according to an embodiment of the present application.

[0025] Figure 6 is a structural schematic view of the reaming assembly in the reaming device for pressure relief hole of underground coal mine according to an embodiment of the present application.

[0026] Figure 7 is a connection schematic view of the rotating assembly in the reaming device for pressure relief hole of underground coal mine according to an embodiment of the present application.

[0027] REFERENCE SIGNS: drill rod 1; mounting portion 11; water delivery assembly 2; reaming assembly 3; barrel 31; water reservoir 311; chute 312; first flow channel 313; first groove segment 3131; water delivery pipe segment 3132; second flow channel 314; third flow channel 315; connecting barrel segment 316; first pipe 32; impact bar 33; jet flow channel 331; jet flow port 332; adjusting unit 34; sealing plug 341; first spring 342; second spring 35; second pipe 4; drilling cone 5; rotating assembly 6; connecting pipe 61; arc-shaped water nozzle 62; paddle 63; driving assembly 7; hydraulic motor 71; hydraulic pump 72. DETAILED DESCRIPTION

[0028] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0029] like Figures 1 to 7 As shown, the underground coal mine pressure relief hole reaming device of this embodiment includes a drill rod 1, a water conveying assembly 2, and a reaming assembly 3. The drill rod 1 is provided with a mounting part 11, which is used for mounting on a fixed platform or for personnel to hold. The water conveying assembly 2 is connected to one end of the drill rod 1 and is used to convey water into the drill rod 1. The reaming assembly 3 is provided at the other end of the drill rod 1 and can rotate relative to the mounting part 11. The reaming assembly 3 includes a cylinder 31, a first pipe 32, and multiple impact bars 33. The two axial ends of the cylinder 31 are respectively sealed. The cylinder 31 is provided with a water tank 311 and multiple... The slide is connected to the water tank 311 at one end and extends out of the cylinder 31 at the other end for conveying water to the water tank 311. The slide is connected to the water tank 311 and extends along the axial direction perpendicular to the cylinder 31. Multiple impact strips 33 are slidably and sealed in the multiple slides and move back and forth along the extension direction of the slides. The impact strips 33 are provided with a jet channel 331 connected to the water tank 311 and a jet port 332 at the impact end. The impact strips 33 are used to move away from the cylinder 31 when the hole expansion assembly 3 rotates relative to the mounting part 11 to impact the hole wall of the pressure relief hole.

[0030] In use, the borehole enlarging device for pressure relief holes in underground coal mines according to this embodiment of the invention is fixed to a fixed platform by the mounting part 11 or held by a person to adjust the position of the drill rod 1. The drilling assembly extends into the pressure relief hole, and water is supplied to the drill rod 1 through the water supply assembly 2. The water enters the water tank 311 through the first pipe 32 connected to the drill rod 1. The water in the water tank 311 reaches the jet channel 331 through the slide and is sprayed through the jet port 332. The sprayed water impacts the hole wall of the pressure relief hole. At the same time, the borehole enlarging assembly 3 rotates relative to the mounting part 11, and the impact bar 33 moves away from the cylinder 31 in a direction perpendicular to the axial direction of the cylinder 31 to impact the hole wall of the pressure relief hole. Under the rotation of the borehole enlarging assembly 3 relative to the mounting part 11, the water impacts the pressure relief hole circumferentially, and the impact bar 33 impacts the pressure relief hole circumferentially. The reciprocating movement of the impact bar 33 in the slide achieves intermittent impact on the hole wall.

[0031] The hole-expanding device for pressure relief holes in underground coal mines according to this invention uses a combination of water and impact bars 33 to impact the hole wall, resulting in high hole-expanding efficiency. At the same time, the water can prevent sparks from being generated when the impact bars 33 collide with the hole wall, ensuring safety and reliability. It also increases the number of cracks generated around the hole after expansion, making the cracks evenly distributed in the pressure relief hole, improving the pressure relief capacity and permeability of the hole, and facilitating the extraction of methane gas from the coal seam.

[0032] In some embodiments, such as Figure 3 , Figure 4 and Figure 5 As shown, the cylinder 31 is provided with a first flow channel 313, a second flow channel 314 and a third flow channel 315 connected in sequence. The first flow channel 313 is connected to the water tank 311, and the first flow channel 313 is provided with an adjustment unit 34 for connecting the second flow channel 314 at a set water pressure. The third flow channel 315 has multiple corresponding slides and is connected in parallel to the second flow channel 314.

[0033] In this embodiment, water is supplied to multiple slides by setting a first flow channel 313, a second flow channel 314, and a third flow channel 315, which facilitates the impact of the water on the hole wall. By connecting the second flow channel 314 through the adjustment component in the first flow channel 313 under a set water pressure, water can be intermittently supplied to the jet flow channel 331, increasing the delivery pressure of the water in the jet flow channel 331, further increasing the impact force of the water on the hole wall, and improving the hole expansion effect.

[0034] Specifically, the cylinder 31 is provided with a first groove section 3131 and a water supply pipe section 3132 connected in sequence. The first groove section 3131 and the water supply pipe section 3132 restrict the first flow channel 313. The first groove section 3131 is located inside the cylinder 31. One end of the water supply pipe section 3132 is sealed to the end of the first groove section 3131. The other end of the water supply pipe section 3132 is connected to the water tank 311. The second flow channel 314 is connected to the first groove section 3131. The regulating unit 34 is located inside the first groove section 3131. When the pressure in the water supply pipe section 3132 reaches the set water pressure, the second flow channel 314 is connected to the first groove section 3131. The water in the water tank 311 is transported to the second flow channel 314 through the water supply pipe section 3132 and the first groove section 3131 to realize the water supply to the jet flow channel 331.

[0035] In some embodiments, such as Figure 4 As shown, the adjustment unit 34 includes a sealing plug 341 and a first spring 342. The sealing plug 341 is slidably and sealingly disposed within the first flow channel 313. The first spring 342 is disposed in the first flow channel 313 and is used to drive the sealing plug 341 to move. The sealing plug 341 has a first position and a second position. In the first position, the first spring 342 has a first length and the sealing plug 341 blocks the inlet of the second flow channel 314. In the second position, the first spring 342 has a second length and the sealing plug 341 opens at least part of the inlet of the second flow channel 314.

[0036] In this embodiment, by setting a first spring 342 and a sealing plug 341, the position of the sealing plug 341 can be adjusted according to the water delivery pressure in the water delivery pipe section 3132 and the elastic force of the first spring 342, thereby realizing the connection control of the first flow channel 313 and the second flow channel 314, which is convenient to operate.

[0037] Specifically, the first spring 342 is disposed within the first groove 3131 and located at the end of the sealing plug 341 furthest from the water supply pipe section 3132. In the first case, the first spring 342 is compressed and has a first length. The sealing plug 341 blocks the first groove 3131 to interrupt the connection between the water supply pipe section 3132 and the second flow channel 314. Water accumulates in the water supply pipe section 3132, causing the water supply pressure to increase. The water pushes the sealing plug 341 to move, further compressing the first spring. 342 until the sealing plug 341 moves to the second position, the first spring 342 retracts from the first length to the second length. At this time, the water supply pipe section 3132 and the second flow channel 314 are connected. The water passes through the water supply pipe section 3132, the first channel section 3131, the second channel section, and the third channel section to reach the jet flow channel 331, realizing intermittent water supply to the jet port 332 and increasing the transport pressure of the water in the jet flow channel 331, further increasing the impact force of the water on the hole wall and improving the hole expansion effect.

[0038] When water enters the jet channel 331, the pressure of the water can further drive the impact bar 33 to move away from the cylinder 31, increasing the impact effect of the impact bar 33 on the hole wall of the pressure relief hole, thereby increasing the hole expansion efficiency of the pressure relief hole.

[0039] In some embodiments, such as Figure 3 and Figure 5 As shown, the hole enlarging assembly 3 includes a second spring 35. The second spring 35 is disposed in the jet channel 331 and extends along the extension direction of the jet channel 331. One end of the second spring 35 is fixedly connected to the impact bar 33 and the other end is fixedly connected to the bottom wall of the slide. The second spring 35 is used to drive the impact bar 33 to move towards the bottom wall of the slide.

[0040] In this embodiment, the second spring 35 drives the impact bar 33 to move towards the bottom wall of the slide. When the first flow channel 313 and the second flow channel 314 are connected, the water entering the turbulent flow channel can drive the impact bar 33 to move away from the cylinder 31. The second spring 35 undergoes elastic deformation under force. When the first flow channel 313 and the second flow channel 314 are blocked, the force of the water driving the impact bar 33 to move away from the cylinder 31 disappears. The second spring 35 returns to its original position and contracts under the action of elastic force, thereby driving the impact bar 33 to move towards the cylinder 31. The intermittent water supply to the turbulent flow channel is realized by the adjustment unit 34 and the reciprocating motion of the impact bar 33 in the slide 312 is realized by the second spring 35, thereby realizing the continuous impact of the impact bar 33 on the hole wall and improving the hole expansion efficiency of the pressure relief hole.

[0041] Optionally, a guide tube is provided inside the turbulent flow channel, and the second spring 35 is sleeved on the guide tube.

[0042] In some embodiments, such as Figure 1, Figure 2 and Figure 6 As shown, there are multiple reaming assemblies 3. The multiple reaming assemblies 3 are arranged sequentially along the axial direction of the drill rod 1 and can be detachably connected. A second pipe 4 is provided on the cylinder 31 with both ends extending out of the cylinder 31. The two ends of the second pipe 4 can be opened and sealed. A connecting cylinder section 316 is provided at the end of the cylinder 31 near the drill rod 1. The connecting cylinder section 316 is used to connect with the adjacent drill rod 1 or cylinder 31 and to restrict the water outlet cavity of the two adjacent cylinders 31. The second pipes 4 on the two adjacent cylinders 31 are connected through the water cavity.

[0043] In this embodiment, by providing multiple reaming components 3, multiple reaming components 3 can operate simultaneously when reaming the pressure relief hole, further improving the reaming efficiency of the device for the pressure relief hole. A connecting cylinder section 316 is provided on the cylinder 31 to facilitate the restriction of the water outlet cavity between two adjacent cylinders 31 and between the cylinder 31 and the drill rod 1, so that the water in the drill rod 1 can reach the water cavity on the side of the corresponding cylinder 31 away from the drill rod 1 through the second pipe 4, thereby replenishing the water in the water tanks 311 in multiple cylinders 31, which facilitates the simultaneous operation of the impact strips 33 in multiple reaming components 3, and also facilitates the connection of multiple cylinders 31.

[0044] Specifically, the connecting cylinder section 316 is provided with internal threads, and the other side of the cylinder 31 and the drill rod 1 are provided with corresponding external threads. The two adjacent cylinders 31 are threaded together, and the cylinder 31 is threaded together with the drill rod 1. The two ends of the second pipe 4 are respectively threaded or inserted with plugs. The plugs are used to open when there is a water cavity on the side of the cylinder 31 away from the rotating rod, so as to connect the two spaced water cavities.

[0045] Optionally, the reaming assembly 3 may be provided in two, three, or four parts.

[0046] In some embodiments, such as Figure 6 As shown, the impact strips 33 on the two cylinders 31 of any two adjacent hole-expanding assemblies 3 are staggered to improve the impact effect of the impact strips 33 on the hole wall.

[0047] In some embodiments, the impact end of the impact strip 33 is at least partially arc-shaped, which facilitates the impact strip 33 to impact the hole wall, increases the contact area of ​​the impact strip 33 with the hole wall, and thus improves the pressure relief effect of the impact strip 33 when impacting the hole wall of the pressure relief hole.

[0048] Optionally, the impact end of the impact bar 33 is an arc-shaped inclined surface extending in one direction, or the impact end of the impact bar 33 is a double arc-shaped inclined surface in the shape of a U.

[0049] In some embodiments, such as Figure 1 and Figure 2As shown, one end of the multiple reaming components 3 away from the drill rod 1 is detachably connected to a drilling cone 5. By setting a drilling hole, while reaming the pressure relief hole, the bottom of the pressure relief hole can also be drilled through the drilling cone 5 to increase the depth of the pressure relief hole and further improve the pressure relief effect of the pressure relief hole.

[0050] In some embodiments, such as Figure 1 , Figure 2 and Figure 7 As shown, it also includes a rotating assembly 6, which includes a connecting pipe 61, an arc-shaped water nozzle 62, and a blade 63. The connecting pipe 61 is fixedly connected to the drill rod 1 and rotatably connected to the cylinder 31. The arc-shaped water nozzle 62 is disposed inside the connecting pipe 61. The blade 63 is fixedly disposed at one end of the cylinder 31 near the connecting pipe 61. The arc-shaped water nozzle 62 is used to adjust the water flow direction in the connecting pipe 61 to drive the blade 63 to rotate.

[0051] In this embodiment, by setting an arc-shaped water nozzle 62, the flow direction of the water entering the connecting pipe 61 is adjusted. The water flowing out of the arc-shaped water nozzle 62 can impact the blade 63, thereby driving the blade 63 to rotate. Through the fixed connection between the blade 63 and the cylinder 31, the rotation of the blade 63 can drive the cylinder 31 to rotate. The rotation of the cylinder 31 can be achieved when the drill rod 1 is stationary relative to the mounting part 11, thereby realizing the enlargement operation of the pressure relief hole. The relative power drives the drill rod 1 to rotate, eliminating the hidden danger of thermal power and having low production cost, safety and reliability.

[0052] Preferably, the rotating assembly 6 includes a ratchet unit, which includes an active part and a driven part. The active part is fixedly connected to the connecting pipe 61, and the driven part is fixedly connected to the cylinder 31. When the drill rod 1 rotates, the active part and the driven part can drive the cylinder 31 to rotate in the first direction. It should be noted that when the water flowing out from the arc-shaped water nozzle 62 impacts the blade 63 and drives the cylinder 31 to rotate, the cylinder 31 also rotates in the first direction. This can combine the rotation of the cylinder 31 driven by the drill rod 1 and the rotation of the cylinder 31 driven by the water. While ensuring the rotation of the cylinder 31, the energy consumption required for the rotation of the drill rod 1 is reduced, resulting in lower production costs.

[0053] In some embodiments, such as Figure 1 As shown, it also includes a drive assembly 7. The drill rod 1 is rotatably assembled with the mounting part 11. The drive assembly 7 is connected to the drill rod 1 and is used to drive the drill rod 1 to rotate relative to the mounting part 11. By setting the drive assembly 7, the drill rod 1 can be driven to rotate relative to the mounting part 11, which improves the stability of the drill rod 1 when rotating and ensures reliable power.

[0054] In some embodiments, such as Figure 1As shown, the drive assembly 7 includes a hydraulic motor 71 and a hydraulic pump 72. The hydraulic motor 71 includes a body and a shaft. The body is fixedly connected to the mounting part 11. The shaft is a hollow shaft and is fixedly connected to the drill rod 1. The other end of the shaft is connected to the water supply assembly 2. The hydraulic pump 72 is connected to the hydraulic motor 71 to drive the hydraulic motor 71 to rotate. By setting up the hydraulic motor 71 and the hydraulic pump 72, installation is convenient and the stability and continuity of the drill rod 1 in the hole enlargement operation are improved.

[0055] In some embodiments, the drive assembly 7 includes a drive motor, which is fixedly disposed relative to the mounting portion 11, and the output end of the drive motor engages with the drill rod 1 for transmission to drive the drill rod 1 to rotate.

[0056] In this embodiment, the drill rod 1 is driven to rotate by a drive motor, which is reliable, easy to assemble, and improves the stability and continuity of the drill rod 1 in the hole reaming operation.

[0057] Specifically, the drive assembly 7 includes a positioning housing fixedly mounted on the mounting part 11. The output shaft of the drive motor extends into the positioning housing and rotates with the positioning housing. The output shaft of the drive motor is provided with a first bevel gear, and the rotating rod is provided with a second bevel gear that meshes with the first bevel gear. The drive motor drives the first bevel gear to rotate, thereby driving the drill rod 1 and the second bevel gear to rotate.

[0058] In some embodiments, the drill rod 1 includes at least two detachably connected connecting rod segments, one end of which is connected to the water supply assembly 2, and the other end of which is connected to the borehole reaming assembly 3. The mounting part 11 is provided to be connected to the connecting rod segment of the water supply assembly 2.

[0059] In this embodiment, by setting the drill rod 1 as at least two detachable connecting rod segments, the number of connecting rod segments can be selected according to the position and depth of the pressure relief hole during drilling operations, thereby increasing the scope of use of the device.

[0060] Specifically, there are at least two connecting rod segments. One connecting rod segment is connected to the water supply component 2, and the other connecting rod segment is connected to the hole enlarging component 3. Adjacent connecting rod segments are connected by threads or by flanges and connecting bolts. Before enlarging the hole, different numbers of connecting rod segments can be selected to accommodate pressure relief holes of different depths.

[0061] Optionally, the water delivery assembly includes a pump body and a connecting water pipe. The connecting water pipe is located on the water delivery side of the pump body, and the other end of the connecting water pipe is rotatably and sealed to the drill rod 1 via a rotating bearing. The pump body delivers water to the connecting water pipe and then delivers it into the drill rod 1 through the connecting water pipe.

[0062] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0063] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0064] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0065] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0066] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0067] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A hole-expanding device for pressure relief holes in underground coal mines, characterized in that, include: A drill rod, wherein the drill rod is provided with a mounting part, the mounting part being used to be mounted on a fixed platform or for personnel to hold; A water delivery assembly, which is connected to one end of the drill pipe and is used to deliver water into the drill pipe; A borehole reaming assembly is disposed at the other end of the drill rod and is rotatable relative to the mounting part. The borehole reaming assembly includes a cylinder, a first tube, and multiple impact bars. The axial ends of the cylinder are respectively sealed. The cylinder is provided with a water tank and multiple slides. One end of the first tube is connected to the water tank and the other end extends out of the cylinder to deliver water to the water tank. The slides are connected to the water tank and extend along an axial direction perpendicular to the cylinder. The multiple impact bars are slidably and sealedly assembled in the multiple slides and reciprocate along the extension direction of the slides. The impact bars are provided with a jet channel connected to the water tank and a jet port at the impact end. The impact bars are used to move away from the cylinder when the borehole reaming assembly rotates relative to the mounting part to impact the borehole wall of the pressure relief hole.

2. The hole-expanding device for pressure relief holes in underground coal mines according to claim 1, characterized in that, The cylinder body is provided with a first flow channel, a second flow channel and a third flow channel connected in sequence. The first flow channel is connected to the water tank and is provided with an adjustment unit for connecting the second flow channel at a set water pressure. The third flow channel is provided with multiple channels corresponding to the slide and is connected in parallel to the second flow channel.

3. The hole-expanding device for pressure relief holes in underground coal mines according to claim 2, characterized in that, The adjusting unit includes a sealing plug and a first spring. The sealing plug is slidably and sealingly disposed within the first flow channel. The first spring is disposed in the first flow channel and is used to drive the sealing plug to move. The sealing plug has a first position and a second position. In the first position, the first spring has a first length and the sealing plug blocks the inlet of the second flow channel. In the second position, the first spring has a second length and the sealing plug opens at least a portion of the inlet of the second flow channel.

4. The hole-expanding device for pressure relief holes in underground coal mines according to claim 3, characterized in that, The enlarging assembly includes a second spring, which is disposed in the jet channel and extends along the extension direction of the jet channel. One end of the second spring is fixedly connected to the impact bar and the other end is fixedly connected to the bottom wall of the slide. The second spring is used to drive the impact bar to move toward the bottom wall of the slide.

5. The hole-expanding device for pressure relief holes in underground coal mines according to claim 1, characterized in that, The borehole reaming assembly is provided in multiple ways. The multiple borehole reaming assemblies are arranged sequentially along the axial direction of the drill rod and are detachably connected. A second pipe with both ends extending out of the cylinder is provided on the cylinder body. The two ends of the second pipe can be opened and sealed. A connecting cylinder section is provided at one end of the cylinder body near the drill rod. The connecting cylinder section is used to connect with the adjacent drill rod or cylinder body and to restrict the water outlet cavity of the two adjacent cylinder bodies. The second pipes on the two adjacent cylinder bodies are connected through the water cavity.

6. The hole-expanding device for pressure relief holes in underground coal mines according to claim 5, characterized in that, The impact bars on the two cylinders of any two adjacent expanding assemblies are staggered; and / or, The impact end of the impact bar is at least partially arc-shaped; and / or, One end of the plurality of reaming assemblies, away from the drill rod, is detachably connected to a drill bit.

7. The hole-expanding device for pressure relief holes in underground coal mines according to any one of claims 1-6, characterized in that, It also includes a rotating assembly, which includes a connecting pipe, an arc-shaped water nozzle, and a blade. The connecting pipe is fixedly connected to the drill rod and rotatably connected to the cylinder. The arc-shaped water nozzle is disposed inside the connecting pipe. The blade is fixedly disposed at one end of the cylinder near the connecting pipe. The arc-shaped water nozzle is used to adjust the water flow direction in the connecting pipe to drive the blade to rotate.

8. The hole-expanding device for pressure relief holes in underground coal mines according to any one of claims 1-6, characterized in that, It also includes a drive assembly, wherein the drill rod is rotatably assembled with the mounting portion, and the drive assembly is drively connected to the drill rod and is used to drive the drill rod to rotate relative to the mounting portion.

9. The hole-expanding device for pressure relief holes in underground coal mines according to claim 8, characterized in that, The drive assembly includes a hydraulic motor and a hydraulic pump. The hydraulic motor includes a body and a shaft. The body is fixedly connected to the mounting part. The shaft is a hollow shaft and is fixedly connected to the drill rod. The other end of the shaft is connected to the water supply assembly. The hydraulic pump is connected to the hydraulic motor to drive the hydraulic motor to rotate. or, The drive assembly includes a drive motor, which is fixedly disposed relative to the mounting portion. The output end of the drive motor engages with the drill rod to drive the drill rod to rotate.

10. The hole-expanding device for pressure relief holes in underground coal mines according to any one of claims 1-6, characterized in that, The drill pipe includes at least two detachably connected connecting rod segments. One connecting rod segment at one end is connected to a water supply assembly, and the other connecting rod segment at the other end is connected to a borehole reaming assembly. The mounting portion is located at the connecting rod segment connected to the water supply assembly.

Images