A coal mine gas extraction hole drilling and supporting integrated drilling device

Abstract

This application relates to an integrated drilling device for coal mine gas drainage holes, comprising a drill rod body, a drill bit at one end of the drill rod body, a folded and tightened support net on the drill rod body, and a support net telescopic structure for controlling the opening of the support net. The support net telescopic structure includes support components located at both ends of the drill rod body and support rods for connecting the support components. The support rods are fixedly connected to the support net. The support components consist of several interconnected arc-shaped plates, each with a connecting groove. Connecting plates are located within the connecting grooves of the connected arc-shaped plates. The two ends of the support rods are fixedly connected to the arc-shaped plates on both sides of the drill rod body. A pushing component is provided on the drill rod body for pushing the support rods outward. By expanding the support net outward, it supports weak and broken coal seam sections, providing support when drilling into weak coal sections, thereby reducing the occurrence of hole collapse, increasing the hole formation rate, and ensuring gas drainage efficiency.

Description

Technical Field

[0001] This application relates to the technical field of coal mine gas extraction, and in particular to an integrated drilling device for coal mine gas extraction holes. Background Technology

[0002] In coal mine production operations, gas extraction through drilling is the most important countermeasure to control gas disasters. Based on the extraction purpose and the drilling stratum, gas extraction can be divided into several types, mainly including cross-stratum drilling, high-level roof drilling, and drilling along the coal seam.

[0003] During the drilling of gas drainage holes in coal mines, when the drill bit penetrates the rock strata and enters a weak and fractured coal seam, excessive drilling speed or the entry of flushing water into the bedding planes causing delamination can lead to borehole collapse. When the collapse is minor, the drainage space is compressed, the drainage volume decreases, and the recovery rate drops. If the collapse is significant, the installation of the drainage pipe becomes difficult, hindering the achievement of gas drainage objectives. In severe cases, the drill bit may become embedded in the fractured coal seam, making extraction impossible and leading to drill bit burial or jamming. These issues can range from affecting the progress to, in severe cases, rendering the borehole unusable. Summary of the Invention

[0004] In order to effectively support weak borehole sections and reduce the collapse rate, support is implemented when drilling into weak coal sections, thereby reducing the occurrence of borehole collapse. This application provides an integrated drilling and support device for coal mine gas drainage holes.

[0005] This application provides an integrated drilling device for coal mine gas extraction holes, which adopts the following technical solution:

[0006] A drilling device integrating drilling and support for coal mine gas extraction holes includes a drill rod body. A drill bit is mounted at one end of the drill rod body. The drill rod body has a folded and tightened support net and a telescopic support net structure for controlling the opening of the support net. The telescopic support net structure includes support components located at both ends of the drill rod body and support rods for connecting the support components. The support rods are fixedly connected to the support net. Each support component consists of several interconnected arc-shaped plates. Connecting grooves are formed on the arc-shaped plates, and connecting plates are provided within the connecting grooves of the connected arc-shaped plates. Both ends of the support rods are fixedly connected to the arc-shaped plates on both sides of the drill rod body. A pushing component is provided on the drill rod body for pushing the support rods outwards.

[0007] By adopting the above technical solution, after the drill rod body passes through the rock strata and drills into the coal seam, the pushing component pushes the support rod to move away from the drill rod body, the connecting plate moves along the connecting groove, and the arc plate moves away from the drill rod body, which expands the stacked support net outward to support the weak and broken coal seam section. When drilling into the weak coal section, support is implemented, thereby reducing the occurrence of hole collapse, improving the hole formation rate, and ensuring the gas extraction efficiency.

[0008] Optionally, the pushing assembly includes a pushing disk and several pushing rods located inside the drill pipe body. The pushing disk is rotatably connected to the drill pipe body. An arc-shaped groove extending from the center of the pushing disk to the outer periphery is provided on the pushing disk. One end of the pushing rod is fixedly connected to the inner side of the arc-shaped plate, and a pushing block located in the arc-shaped groove is provided on the other end of the pushing rod.

[0009] By adopting the above technical solution, the pusher disc is rotated, the pusher block moves along the arc groove, and the pusher rod moves away from the center of the drill rod body and moves outward.

[0010] Optionally, the push plate has a threaded hole at its center, and a threaded rod is movably disposed inside the drill rod body. The threaded rod moves along the length of the drill rod body and passes through the threaded hole to be threadedly connected to the push plate.

[0011] By adopting the above technical solution, the threaded rod moves along the length of the drill rod body, and the threaded rod drives the push disk to rotate through the threaded hole.

[0012] Optionally, an elastic spring is fixedly connected between the end of the threaded rod near the drill bit and the drill rod body, the elastic spring being in a compressed state, and a pull rope is fixedly connected between the end of the threaded rod near the elastic spring and the drill rod body.

[0013] By adopting the above technical solution, the pull rope is in a taut state, the elastic spring is in a compressed state, and the threaded rod tends to move away from the drill rod body. When the pull rope is cut, the elastic spring drives the threaded rod to start, which in turn drives the pusher disc to rotate.

[0014] Optionally, a cutting blade corresponding to the pull rope is provided inside the drill rod body, and a rotating shaft is rotatably connected inside the drill rod body. The rotating shaft passes through the cutting blade and is fixedly connected to the cutting blade.

[0015] By adopting the above technical solution, the cutting blade can easily cut the rope by rotating the rotating shaft.

[0016] Optionally, a rotary motor is installed inside the drill rod body, and the output shaft of the rotary motor is fixedly connected to the rotary shaft. A pressure sensor is installed on the drill bit, and the pressure sensor is electrically connected to a distance sensor, which is also electrically connected to the rotary motor. When the drill bit penetrates the rock strata and drills into the coal seam, the pressure sensor senses the pressure change and sends a signal to the distance sensor. After receiving the signal from the pressure sensor, the distance sensor measures the distance the drill rod body has moved. When the drill rod body pushes into the coal seam by one drill rod length, it sends a signal to the rotary motor to drive the output shaft of the rotary motor to rotate.

[0017] By adopting the above technical solution, when the drill bit passes through the rock strata and drills into the coal seam, when the drill rod body moves a distance equal to the length of the drill rod body into the coal seam, the output shaft of the rotating motor drives the cutting blade to rotate, cuts the pull rope, and automatically expands the folded support net outward.

[0018] Optionally, a stopper is provided at the end of the threaded rod away from the drill bit, the stopper being elastic, and a stopper groove is provided in the drill rod body to cooperate with the end of the stopper.

[0019] By adopting the above technical solution, when the threaded rod moves away from the drill rod body, the blocking component moves along with the threaded rod. After the support net is fully expanded, the blocking component is stuck in the blocking groove, preventing the threaded rod from moving towards the drill rod body, thus tightening the threaded rod and improving the stability of the support net.

[0020] Optionally, a connecting hook is provided at the end of the connecting plate away from the arc-shaped plate.

[0021] By adopting the above technical solution, the stability of the connection between adjacent arc-shaped plates after the support net is opened is improved by using connecting hooks.

[0022] In summary, this application includes at least one of the following beneficial technical effects:

[0023] 1. After the drill rod body passes through the rock strata and drills into the coal seam, the push assembly pushes the support rod to move away from the drill rod body. The connecting plate moves along the connecting groove, and the arc plate moves away from the drill rod body, which opens the stacked support net outward to support the weak and broken coal seam section. When drilling into the weak coal section, support is implemented to reduce the occurrence of hole collapse, improve the hole formation rate, and ensure the gas extraction efficiency.

[0024] 2. When the drill bit cutter penetrates the rock strata and drills into the coal seam, when the drill rod body moves a distance equal to the length of the drill rod body into the coal seam, the output shaft of the rotating motor drives the cutting blade to rotate, cuts the pull rope, and automatically expands the folded support net outward. Attached Figure Description

[0025] Figure 1This is a schematic diagram of the overall structure of this embodiment.

[0026] Figure 2 This is a schematic diagram of the push component in this embodiment, showing the support net in a folded and locked state.

[0027] Figure 3 This is a schematic diagram of the structure of the pushing component when the support net is in an open state, as shown in this embodiment.

[0028] Figure 4 This is a schematic diagram illustrating the connection relationship between the blocking component and the blocking groove in this embodiment.

[0029] Figure 5 yes Figure 2 An enlarged schematic diagram of part A in the middle.

[0030] Figure 6 This embodiment shows the control flowchart of the pressure sensor and the rotating motor.

[0031] Explanation of reference numerals in the attached drawings: 1. Drill rod body; 11. Drill rod connection knob; 12. Drill bit; 13. Stop groove; 14. Elastic spring; 15. Pull rope; 2. Support net; 3. Support assembly; 31. Arc plate; 311. Connecting groove; 312. Connecting plate; 313. Connecting hook; 4. Support rod; 41. Guide rod; 5. Push assembly; 51. Push disk; 511. Arc groove; 52. Push rod; 521. Push block; 6. Threaded rod; 61. Stopping element; 7. Cutting blade; 71. Rotating shaft; 8. Pressure sensor. Detailed Implementation

[0032] The present application will be further described in detail below with reference to all the accompanying drawings.

[0033] This application discloses an integrated drilling device for coal mine gas extraction holes.

[0034] Reference Figure 1 A drilling device integrating drilling and support for coal mine gas extraction holes includes a drill rod body 1, a drill rod connection knob 11 installed at one end of the drill rod body 1, and a drill bit 12 installed at the other end of the drill rod body 1.

[0035] Reference Figure 1 and Figure 2 The drill pipe body 1 is equipped with a support net 2 and a support net telescopic structure. The support net telescopic structure includes a support component 3 and a support rod 4 located at both ends of the drill pipe body 1. The two ends of the support rod 4 are connected to the support component 3, and the support rod 4 is fixedly connected to the support net 2. The support net 2 is in a folded and locked state. When the support rod 4 moves away from the drill pipe body 1, it causes the support net 2 to open and support the weak and broken coal seam section.

[0036] Reference Figure 2 and Figure 3 The support assembly 3 consists of several interconnected arc-shaped plates 31. The two ends of the support rod 4 are fixedly connected to the arc-shaped plates 31 at both ends of the drill rod body 1. The arc-shaped plates 31 are provided with connecting grooves 311. Connecting plates 312 are fixedly connected to both ends of the arc-shaped plates 31. The connecting plates 312 are located in the connecting grooves 311 of adjacent arc-shaped plates 31. The support rod 4 moves away from the drill rod body 1, the connecting plates 312 move along the connecting grooves 311, and the arc-shaped plates 31 move away from the drill rod body 1. The support net 2 in the stacked state expands outward to support the weak and broken coal seam section. When drilling to the weak coal section, support is provided to reduce the occurrence of hole collapse, improve the hole formation rate, and ensure the gas extraction efficiency. The end of the connecting plate 312 away from the arc-shaped plate 31 is fixedly connected to a connecting hook 313. The connecting plate 312 and the connecting hook 313 pass through the connecting grooves 311 and abut against the outside of the arc-shaped plates 31, improving the stability of the connection between adjacent arc-shaped plates 31.

[0037] Reference Figure 2 and Figure 3 A pushing assembly 5 is installed on the drill pipe body 1. The pushing assembly 5 is installed on the side of the drill pipe body 1 near the drill bit 12. The pushing assembly 5 includes a pushing disk 51 and several pushing rods 52. A rotating cavity is opened inside the drill pipe body 1. The pushing disk 51 is located in the rotating cavity and is rotatably connected to the drill pipe body 1. Several pushing cavities communicating with the rotating cavity are opened outside the drill pipe body 1. The pushing rods 52 are located in the pushing cavities and move along the pushing cavities. One end of the pushing rod 52 is fixedly connected to the inner side of the arc plate 31. When the pushing rod 52 moves along the pushing cavity in a direction away from the drill pipe body 1... The push rod 52 moves the arc plate 31 away from the drill rod body 1 to open the support net 2. The end of the push rod 52 away from the arc plate 31 is fixedly connected to the push block 521. The push plate 51 has several arc grooves 511 extending from the center of the push plate 51 to the outer periphery. The arc grooves 511 correspond one-to-one with the push blocks 521. The push blocks 521 are located in the arc grooves 511. When the push plate 51 rotates, the push blocks 521 move along the arc grooves 511, moving the push rod 52 away from the center of the drill rod body 1 and moving the push rod 52 outward.

[0038] Reference Figure 1 The drill pipe body 1 has a guide groove at the end away from the push assembly 5. The push rod 52 is fixedly connected to a guide rod 41 at the end away from the push assembly 5. The guide rod 41 is located in the guide groove and moves along the guide groove. When the push assembly 5 moves the push rod 52 away from the center of the drill pipe body 1, the guide rod 41 moves along the guide groove, improving the overall stability of the drill pipe.

[0039] Reference Figure 2 and Figure 4The drill rod body 1 has a through cavity that communicates with the rotating cavity along the length of the drill rod body 1. A threaded rod 6 is movably arranged in the cavity. A threaded hole is opened at the center of the push disk 51. The position of the threaded hole corresponds to the cavity. The threaded rod 6 passes through the threaded hole. When the threaded hole moves along the length of the drill rod body 1 in the cavity, it drives the push disk 51 to rotate through the threaded hole.

[0040] Reference Figure 4 and Figure 5 An elastic spring 14 is installed inside the cavity. Both ends of the elastic spring 14 are fixedly connected to the threaded rod 6 and the drill rod body 1, respectively. The elastic spring 14 is in a compressed state, giving the threaded rod 6 a tendency to move away from the drill rod body 1. A pull rope 15 is installed inside the cavity. Both ends of the pull rope 15 are fixedly connected to the threaded rod 6 and the drill rod body 1, respectively. The pull rope 15 is in a taut state. When the pull rope 15 is cut, the elastic spring 14 pushes the threaded rod 6 to move, causing the pusher disc 51 to rotate.

[0041] Reference Figure 4 A stopper 61 is fixedly connected to the end of the threaded rod 6 away from the elastic spring 14. The stopper 61 is made of elastic alloy steel. A stopper groove 13 communicating with the cavity is opened in the drill rod body 1. When the threaded rod 6 moves away from the drill rod body 1, the stopper 61 moves with the threaded rod 6. After the support net 2 is fully opened, the stopper 61 is stuck in the stopper groove 13, preventing the threaded rod 6 from moving towards the drill rod body 1, thus clamping the threaded rod 6 and improving the stability of the support net 2.

[0042] Reference Figure 2 and Figure 5 The drill rod body 1 is equipped with a cutting blade 7 corresponding to the pull rope 15. A rotating shaft 71 is rotatably connected inside the drill rod body 1. The rotating shaft 71 passes through the cutting blade 7 and is fixedly connected to the cutting blade 7. The rotating shaft 71 rotates to drive the cutting blade 7 to move and cut the pull rope 15.

[0043] Reference Figure 1 and Figure 6 A rotary motor is installed inside the drill rod body 1. The output shaft of the rotary motor is fixedly connected to the rotary shaft 71. A pressure sensor 8 is installed on the drill bit 12. The pressure sensor 8 is electrically connected to a distance sensor. When the drill bit 12 penetrates the rock strata and drills into the coal seam, the pressure sensor 8 senses the pressure change and sends a signal to the distance sensor. The distance sensor measures the distance and is electrically connected to the rotary motor. When the drill rod body 1 pushes into the coal seam by one drill rod length, the distance sensor sends a signal to the rotary motor to drive the output shaft of the rotary motor to rotate, thereby driving the cutting blade 7 (see...). Figure 5 The device rotates to cut the pull rope 15, automatically expanding the folded support net 2 outward.

[0044] The implementation principle of the integrated drilling device for coal mine gas extraction holes according to the embodiments of this application is as follows: After the drill rod body 1 passes through the rock strata and drills into the coal seam, the pusher disc 51 rotates, the pusher block 521 moves along the arc groove 511, and the pusher rod 52 moves away from the center of the drill rod body 1. The pusher component 5 pushes the support rod 4 away from the drill rod body 1, the connecting plate 312 moves along the connecting groove 311, and the arc plate 31 moves away from the drill rod body 1, which expands the stacked support net 2 outward to support the weak and broken coal seam section. When drilling into the weak coal section, support is implemented, thereby reducing the occurrence of hole collapse, improving the hole formation rate, and ensuring the gas extraction efficiency.

[0045] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A drilling device integrating drilling and support for coal mine gas extraction holes, comprising a drill rod body (1), wherein a drill bit (12) is provided at one end of the drill rod body (1), characterized in that: The drill rod body (1) is provided with a support net (2) in a folded and tightened state and a support net telescopic structure for controlling the opening of the support net (2). The support net telescopic structure includes support components (3) located at both ends of the drill rod body (1) and support rods (4) for connecting the support components (3). The support rods (4) are fixedly connected to the support net (2). The support components (3) are composed of several interconnected arc plates (31). The arc plates (31) are provided with connecting grooves (311). The arc plates (31) are provided with connecting plates (312) located in the connecting grooves (311) of adjacent arc plates (31). The two ends of the support rods (4) are fixedly connected to the arc plates (31) on both sides of the drill rod body (1). The drill rod body (1) is provided with a pushing component (5) for pushing the support rods (4) to open outward. The pushing assembly (5) includes a pushing disk (51) and a plurality of pushing rods (52) located inside the drill pipe body (1). The pushing disk (51) is rotatably connected to the drill pipe body (1). An arc-shaped groove (511) extending from the center of the pushing disk (51) to the outer periphery is provided on the pushing disk (51). One end of the pushing rod (52) is fixedly connected to the inner side of the arc plate (31), and a pushing block (521) located in the arc-shaped groove (511) is provided on the other end of the pushing rod (52). The push plate (51) has a threaded hole in the center, and a threaded rod (6) is movably arranged inside the drill rod body (1). The threaded rod (6) moves along the length direction of the drill rod body (1), and the threaded rod (6) passes through the threaded hole and is threadedly connected to the push plate (51). An elastic spring (14) is fixedly connected between the end of the threaded rod (6) near the drill bit (12) and the drill rod body (1). The elastic spring (14) is in a compressed state. A pull rope (15) is fixedly connected between the end of the threaded rod (6) near the elastic spring (14) and the drill rod body (1). The drill rod body (1) is provided with a cutting blade (7) corresponding to the pull rope (15). A rotating shaft (71) is rotatably connected inside the drill rod body (1). The rotating shaft (71) passes through the cutting blade (7) and is fixedly connected to the cutting blade (7). A rotary motor is installed inside the drill rod body (1). The output shaft of the rotary motor is fixedly connected to the rotary shaft (71). A pressure sensor (8) is installed on the drill bit (12). The pressure sensor (8) is electrically connected to a distance sensor. The distance sensor is electrically connected to the rotary motor. When the drill bit (12) passes through the rock strata and drills into the coal seam, the pressure sensor (8) senses the pressure change and sends a signal to the distance sensor. After receiving the signal sent by the pressure sensor (8), the distance sensor measures the distance moved by the drill rod body (1). When the drill rod body (1) pushes into the coal seam by one drill rod length, it sends a signal to the rotary motor to drive the output shaft of the rotary motor to rotate.

2. The integrated drilling device for coal mine gas extraction holes according to claim 1, characterized in that: The threaded rod (6) has a stopper (61) at one end away from the drill bit (12). The stopper (61) is elastic, and the drill rod body (1) has a stopper groove (13) that cooperates with the end of the stopper (61).

3. The integrated drilling device for coal mine gas extraction holes according to claim 1, characterized in that: The end of the connecting plate (312) away from the arc plate (31) is provided with a connecting hook (313).

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