A coal mine drilling hole grouting hole sealing device

Abstract

This utility model relates to the field of borehole sealing technology and discloses a coal mine borehole grouting and sealing device; it includes a mounting frame and a support cylinder rotatably connected inside the mounting frame. A bearing seat is installed at the bottom of the support cylinder, and a connecting cylinder is fixedly connected to the bottom of the bearing seat. Through a drive assembly combined with a limiting component, when the support cylinder enters the borehole, rotating the first torsion ring causes the threaded sleeve to descend, cooperating with the connecting rod and guide rod to unfold the pressure ring and press it against the inner wall of the borehole, achieving rapid centering and ensuring uniform force during airbag expansion. By cooperating with rotating the second torsion ring, the threaded ring drives the push rod to rise, thereby pressing against the airbag. The airbag is compressed, resulting in lateral expansion, which quickly and initially seals the borehole. Then, with the openings on the support cylinder and the second torsion ring, grout is filled and evenly flows onto the top of the airbag and adheres to the inner wall of the borehole, achieving a sealing effect.

Description

Technical Field

[0001] This utility model relates to the field of borehole sealing technology, specifically a coal mine borehole grouting and sealing device. Background Technology

[0002] The grouting and sealing device for coal mine boreholes plays a crucial role in coal mine production, including preventing gas disasters by sealing fissures and increasing coal strength; preventing water hazards by sealing water channels and reinforcing the water-resistant layer; and maintaining roadway stability by reinforcing the surrounding rock and preventing water seepage.

[0003] Currently, there are many methods for sealing boreholes after drilling in coal mines. Among them, internal grouting and compression capsule expansion sealing are two different sealing methods. Internal grouting requires a long grouting time and the grout solidifies slowly, which in turn leads to a long sealing time. Compression capsule expansion sealing has a single sealing method, which results in weak sealing performance. Moreover, before grouting and sealing, due to the natural difference in borehole diameter, it is often difficult to quickly achieve centering after the sealing device is sent into the hole. During subsequent grouting, the device is prone to deviating from the edge of the borehole wall, resulting in uneven grout distribution and insufficient local sealing thickness, which in turn leads to hidden dangers such as gas leakage or water seepage. Utility Model Content

[0004] The purpose of this utility model is to provide a coal mine drilling grouting and sealing device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a coal mine drilling grouting and sealing device, including a mounting frame, and further comprising:

[0006] A support cylinder is rotatably connected inside the mounting frame. A bearing seat is installed at the bottom of the support cylinder. A connecting cylinder is fixedly connected to the bottom of the bearing seat. An air bladder is provided on the surface of the connecting cylinder. A transmission rod is provided between the interior of the support cylinder and the connecting cylinder.

[0007] A drive assembly is disposed on the surface of the support cylinder for centering the support cylinder and sealing the hole. The drive assembly also includes a limiting member. A connecting ring is fixedly connected to the surface of the support cylinder. Discharge holes are opened on both sides inside the support cylinder. An exhaust pipe penetrating the bearing seat is disposed between the interior of the support cylinder and the connecting cylinder.

[0008] Preferably, the drive assembly includes a torsion ring, a threaded sleeve, a rotating ring, three connecting rods, and three guide rods. The torsion ring is fixed to the top of the support cylinder surface. The threaded sleeve is threadedly connected to the support cylinder surface, and the support cylinder surface is provided with threads for use with the threaded sleeve. The rotating ring is rotatably connected to the surface of the connecting ring. The connecting rod is hinged to the surface of the threaded sleeve. The guide rod is hinged to the surface of the rotating ring. One end of the connecting rod is hinged to the middle position of the guide rod. A pressure ring is hinged to the side of the guide rod away from the rotating ring.

[0009] Preferably, a centering plate is hinged to one side of the pressure ring, and one side of the centering plate is hinged synchronously with the position of the connecting rod. A positioning cone is fixedly connected to one side of the pressure ring.

[0010] Preferably, the drive assembly further includes a second torsion ring, a connecting block, a threaded ring, a push rod, and a push ring. The second torsion ring is rotatably connected to the top of the support cylinder via a bearing. The connecting block is fixed inside the second torsion ring and is fixedly connected to the transmission rod on one side. The threaded ring is threadedly connected to the bottom of the transmission rod surface, and the transmission rod surface is provided with threads for use with the threaded ring. The push rod is fixed to the top of the threaded ring, and its top is fixedly connected to the push ring. The top of the push ring moves against the airbag.

[0011] Preferably, the limiting member includes a connecting plate fixed to the top of the mounting bracket, the connecting plate having a connecting groove inside, push plates being provided at the top and bottom of the connecting groove, a spring being fixedly connected between the two push plates, and a plug rod being fixedly connected to one side of each of the two push plates, and slots for use with the plug rods being opened inside the first torsion ring and the second torsion ring.

[0012] Preferably, a limiting rod is fixedly connected inside the connecting groove, and the surface of the limiting rod is slidably connected to the inside of the push plate.

[0013] Preferably, a limit ring is fixedly connected to the bottom of the transmission rod, and mounting plates are fixedly connected to both sides of the mounting bracket.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] This invention, through a drive assembly combined with a limiting component, allows the support cylinder to enter the borehole. Rotating the first torsion ring lowers the threaded sleeve, which, in conjunction with the connecting rod and guide rod, unfolds the pressure ring and presses it against the borehole wall, achieving rapid centering. This ensures uniform force distribution during airbag expansion, preventing insufficient expansion or excessive compression due to unilateral deviation. It also creates an initial seal between the airbag and the borehole wall, reducing the risk of gaps. Secondly, in the centered state, the grout can be evenly distributed within the annular space between the device and the borehole wall during subsequent grouting, ensuring consistent grout thickness in all directions. This avoids problems such as insufficient grout thickness and insufficient strength after curing due to edge deviation. Then, rotating the second torsion ring causes the threaded ring to drive the push rod, raising the push ring and pressing against the airbag. The compressed airbag expands laterally, quickly achieving a preliminary seal. Finally, the openings on the support cylinder and the second torsion ring allow grout to be filled, flowing evenly onto the top of the airbag and adhering to the borehole wall, achieving a final sealing effect. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a preferred embodiment of a coal mine drilling grouting and sealing device provided by this utility model;

[0017] Figure 2 This is a schematic diagram of the structure from another perspective provided by this utility model;

[0018] Figure 3 This is a cross-sectional view of the support cylinder provided by this utility model;

[0019] Figure 4 Provided by this utility model Figure 3 Enlarged structural diagram at point A in the middle;

[0020] Figure 5 A schematic diagram of the threaded sleeve structure provided by this utility model;

[0021] Figure 6 Provided by this utility model Figure 5 Enlarged structural diagram at point B.

[0022] In the diagram: 1. Mounting bracket; 2. Support cylinder; 3. Bearing seat; 4. Connecting cylinder; 5. Airbag; 6. Transmission rod; 7. Drive assembly; 701. Torsion ring one; 702. Threaded sleeve; 703. Rotating ring; 704. Connecting rod; 705. Guide rod; 706. Pressing ring; 707. Centering plate; 708. Positioning cone; 709. Torsion ring two; 710. Connecting block; 711. Threaded ring; 712. Push rod; 713. Push ring; 77. Limiting component; 7701. Connecting plate; 7702. Connecting groove; 7703. Push plate; 7704. Spring; 7705. Insert rod; 7706. Slot; 7707. Limiting rod; 8. Connecting ring; 9. Discharge hole; 10. Exhaust pipe; 11. Limiting ring; 12. Mounting plate. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1-6 As shown, a coal mine drilling grouting and sealing device includes a mounting frame 1 and a support cylinder 2 rotatably connected inside the mounting frame 1. A bearing seat 3 is installed at the bottom of the support cylinder 2, and a connecting cylinder 4 is fixedly connected to the bottom of the bearing seat 3. An air bladder 5 is provided on the surface of the connecting cylinder 4, and a transmission rod 6 is provided between the interior of the support cylinder 2 and the connecting cylinder 4.

[0025] A drive assembly 7 is installed on the surface of the support cylinder 2 for centering the support cylinder 2 and sealing the holes. The drive assembly 7 also includes a limiting member 77. A connecting ring 8 is fixedly connected to the surface of the support cylinder 2. Discharge holes 9 are opened on both sides inside the support cylinder 2. An exhaust pipe 10 is provided between the interior of the support cylinder 2 and the connecting cylinder 4, penetrating the bearing seat 3. The bottom of the exhaust pipe 10 is fixed to the connecting cylinder 4, and the top extends to the top of the support cylinder 2. A limiting ring 11 is fixedly connected to the bottom of the transmission rod 6. Mounting plates 12 are fixedly connected to both sides of the mounting frame 1. Firstly, the mounting frame 1 facilitates the limiting and fixing of the support cylinder 2. Secondly, the surface of the support cylinder 2 is provided with a bearing that rotates with the inner wall of the mounting frame 1 to facilitate limiting its rotation. The bearing seat 3 ensures that the rotation of the support cylinder 2 will not cause the connecting cylinder 4 to rotate, preventing it from being affected by subsequent sealing operations. The airbag 5 is located on the surface of the connecting cylinder 4, which can work with the drive assembly 7 to make the airbag 5 unfold and fit against the inner wall of the borehole. The transmission rod 6 can work with the drive assembly 7 to achieve the effect of pressing against the airbag 5. The connecting ring 8 also assists the drive assembly 7 in subsequent use. The discharge hole 9 allows the grouting material to be introduced from the top of the support cylinder 2 to the top of the airbag 5 for sealing. The limiting ring 11 can limit the final stroke of the airbag 5 to prevent it from falling. The mounting plate 12 has holes to facilitate the positioning of the mounting frame 1.

[0026] The drive assembly 7 includes a torsion ring 701, a threaded sleeve 702, a rotating ring 703, three connecting rods 704, and three guide rods 705. The torsion ring 701 is fixed to the top of the surface of the support cylinder 2. The threaded sleeve 702 is threadedly connected to the surface of the support cylinder 2, and the surface of the support cylinder 2 is provided with threads that cooperate with the threaded sleeve 702. The rotating ring 703 is rotatably connected to the surface of the connecting ring 8. The connecting rods 704 are hinged to the surface of the threaded sleeve 702. The guide rods 705 are hinged to the surface of the rotating ring 703. One end of the connecting rod 704 is hinged to the middle position of the guide rod 705. A pressure ring 706 is hinged to the side of the guide rod 705 away from the rotating ring 703. A centering plate 707 is hinged to one side of the pressure ring 706. One side of the centering plate 707 is synchronously hinged to the position of the connecting rod 704. A positioning cone 708 is fixedly connected to one side of the pressure ring 706. When the user needs to center the support cylinder 2 in the middle of the drill hole, the torsion ring 701 is rotated. 701 drives the support cylinder 2 to rotate inside the mounting frame 1. At this time, the threaded sleeve 702 will descend at the thread on the surface of the support cylinder 2. As the threaded sleeve 702 descends, it will drive the connecting rod 704 to descend the guide rod 705. As the guide rod 705 descends, it will drive the pressure ring 706 to gradually approach the inner wall of the borehole. At the same time, the centering plate 707 is hinged between the threaded sleeve 702 and the pressure ring 706, which can ensure that the angle of the pressure ring 706 is horizontal so as to fit against the inner wall of the borehole. As the threaded sleeve 702 descends, the pressure ring 706 will drive the positioning cone 708 to insert into the inner wall of the borehole to achieve positioning. Through the three pressure rings 706 and the multi-link setup, the center position of the borehole can be quickly found and positioned to ensure that the grout can be evenly distributed in the annular space between the device and the borehole wall during subsequent grouting, ensuring that the grout thickness is consistent in all directions and avoiding the problem of local grout being too thin and insufficient strength after curing due to deviation to the edge.

[0027] The drive assembly 7 also includes a second torsion ring 709, a connecting block 710, a threaded ring 711, a push rod 712, and a push ring 713. The second torsion ring 709 is rotatably connected to the top of the support cylinder 2 via a bearing. The connecting block 710 is fixed inside the second torsion ring 709 and fixedly connected to the transmission rod 6 on one side. The threaded ring 711 is threaded to the bottom of the surface of the transmission rod 6, and the surface of the transmission rod 6 is provided with threads that cooperate with the threaded ring 711. The push rod 712 is fixed to the top of the threaded ring 711, and its top is fixedly connected to the push ring 713. The top of ring 713 presses against the airbag 5. When the user needs to squeeze the airbag 5 to make it expand and fit against the inner wall of the borehole, the second twisting ring 709 is rotated. At this time, the second twisting ring 709 will rotate on the top of the support cylinder 2 and drive the transmission rod 6 to rotate in conjunction with the connecting block 710. At this time, the threaded ring 711 located at the thread of the transmission rod 6 will be lifted by force. As the threaded ring 711 rises, it will drive the push rod 712 and the push ring 713 to rise, thereby pressing against the airbag 5 to make it expand laterally and fit against the inner wall of the borehole, achieving a preliminary sealing effect.

[0028] The limiting component 77 includes a connecting plate 7701 fixed to the top of the mounting bracket 1. The connecting plate 7701 has a connecting groove 7702 inside. Push plates 7703 are provided at the top and bottom of the inner cavity of the connecting groove 7702. A spring 7704 is fixedly connected between the two push plates 7703. Insert rods 7705 are fixedly connected to one side of each of the two push plates 7703. Slots 7706 for use with the insert rods 7705 are provided inside both the first torsion ring 701 and the second torsion ring 709. A limiting rod 7707 is fixedly connected inside the connecting groove 7702. The surface of the limiting rod 7707 is flush with the push plate 7701. The internal sliding connection of 03, however, before adjusting the torsion ring 1 701 and torsion ring 2 709, it is necessary to pinch the two push plates 7703 relative to each other to make the insertion rod 7705 disengage from its respective connecting groove 7702. At this time, the push plate 7703 will move to a limit on the surface of the limit rod 7707 and compress the spring 7704. Only then can the torsion ring 1 701 or the torsion ring 2 709 be rotated. The two limit pieces 77 are set to lock the torsion ring 1 701 and the torsion ring 2 709 to prevent the threaded connection on the support cylinder 2 and the transmission rod 6 from loosening and rotating, thus ensuring the stability of the sealing hole.

[0029] Working principle: First, the mounting bracket 1 is inserted into the borehole along with the support cylinder 2. Before adjusting the torsion ring 701 and torsion ring 709, the two push plates 7703 are pinched relative to each other to disengage the insertion rod 7705 from its respective connecting groove 7702. At this time, the push plate 7703 will move to a limit on the surface of the limiting rod 7707 and compress the spring 7704. Only then can the torsion ring 701 or the torsion ring 709 be rotated. When the user needs to center the support cylinder 2 in the middle of the borehole, the torsion ring 701 is rotated to drive the support cylinder 2 to rotate inside the mounting bracket 1. At this time, the threaded sleeve 702 will descend at the thread on the surface of the support cylinder 2. As the threaded sleeve 702 descends, it will drive the connecting rod 704 to guide it. As guide rod 705 descends, it causes pressure ring 706 to gradually approach the borehole wall. Simultaneously, the centering plate 707, hinged between threaded sleeve 702 and pressure ring 706, ensures the pressure ring 706 is horizontal, facilitating its fit against the borehole wall. Furthermore, as threaded sleeve 702 descends, pressure ring 706 causes positioning cone 708 to insert into the borehole wall for positioning. The combination of three pressure rings 706 and multiple connecting rods allows for quick location of the borehole center, ensuring uniform grout distribution within the annular space between the device and the borehole wall during subsequent grouting. This guarantees consistent grout thickness in all directions, preventing thin grout areas at the edges and insufficient strength after curing. Regarding the issue, it needs to be clarified that during this process, the connecting cylinder 4 is not affected by the rotation of the supporting cylinder 2, because the bearing seat 3 set in the middle can assist the supporting cylinder 2 in rotating at the top of the connecting cylinder 4. Then, to seal the inner wall of the borehole by laterally expanding the airbag 5, the second torsion ring 709 is rotated. At this time, the second torsion ring 709 will rotate at the top of the supporting cylinder 2, and together with the connecting block 710, drive the transmission rod 6 to rotate. At this time, the threaded ring 711 located at the thread of the transmission rod 6 will be subjected to force and rise. As the threaded ring 711 rises, it will drive the push rod 712 and the push ring 713 to rise, thereby pressing against the airbag 5 to cause it to expand laterally and fit against the inner wall of the borehole, achieving a preliminary sealing effect. At this time, the first torsion ring 701 and the second torsion ring 709 are then rotated. The connecting groove 7702 on the second torsion ring 709 is aligned with the insertion rod 7705, and the push plate 7703 is released. At this time, the spring 7704 drives the push plate 7703 to reset, so that the insertion rod 7705 is inserted into the connecting groove 7702, limiting and locking the first torsion ring 701 and the second torsion ring 709. Then, through the top position of the second torsion ring 709 and the support cylinder 2, the slurry is filled and evenly distributed in the top of the airbag 5 through the discharge hole 9 to fill the borehole, achieving the sealing effect. It should be noted that the position of the exhaust pipe 10 is also close to the inside of the second torsion ring 709. Before filling, the head needs to be sealed. After the slurry is fixed, the exhaust pipe 10 can be connected to the gas storage equipment with the pipeline, so as to extract the gas in the borehole.

[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A coal mine borehole grouting and sealing device, comprising a mounting frame (1), characterized in that, Also includes: A support cylinder (2) is rotatably connected inside the mounting frame (1). A bearing seat (3) is installed at the bottom of the support cylinder (2). A connecting cylinder (4) is fixedly connected to the bottom of the bearing seat (3). An air bladder (5) is provided on the surface of the connecting cylinder (4). A transmission rod (6) is provided between the interior of the support cylinder (2) and the connecting cylinder (4). A drive assembly (7) is provided on the surface of the support cylinder (2) for centering the support cylinder (2) and sealing the hole. The drive assembly (7) also includes a limiting member (77). A connecting ring (8) is fixedly connected to the surface of the support cylinder (2). Discharge holes (9) are provided on both sides inside the support cylinder (2). An exhaust pipe (10) that penetrates the bearing seat (3) is provided between the interior of the support cylinder (2) and the connecting cylinder (4).

2. The coal mine drilling grouting and sealing device according to claim 1, characterized in that: The drive assembly (7) includes a torsion ring (701), a threaded sleeve (702), a rotating ring (703), three connecting rods (704), and three guide rods (705). The torsion ring (701) is fixed to the top of the surface of the support cylinder (2). The threaded sleeve (702) is threaded to the surface of the support cylinder (2), and the surface of the support cylinder (2) is provided with threads that cooperate with the threaded sleeve (702). The rotating ring (703) is rotatably connected to the surface of the connecting ring (8). The connecting rod (704) is hinged to the surface of the threaded sleeve (702). The guide rod (705) is hinged to the surface of the rotating ring (703). One end of the connecting rod (704) is hinged to the middle position of the guide rod (705). A pressure ring (706) is hinged to the side of the guide rod (705) away from the rotating ring (703).

3. A coal mine drilling grouting and sealing device according to claim 2, characterized in that: A centering plate (707) is hinged to one side of the pressing ring (706), and one side of the centering plate (707) is hinged synchronously with the position of the connecting rod (704). A positioning cone (708) is fixedly connected to one side of the pressing ring (706).

4. The coal mine drilling grouting and sealing device according to claim 1, characterized in that: The drive assembly (7) further includes a second torsion ring (709), a connecting block (710), a threaded ring (711), a push rod (712), and a push ring (713). The second torsion ring (709) is rotatably connected to the top of the support cylinder (2) via a bearing. The connecting block (710) is fixed inside the second torsion ring (709) and one side is fixedly connected to the transmission rod (6). The threaded ring (711) is threadedly connected to the bottom of the surface of the transmission rod (6), and the surface of the transmission rod (6) is provided with a thread for use with the threaded ring (711). The push rod (712) is fixed to the top of the threaded ring (711), and the top is fixedly connected to the push ring (713). The top of the push ring (713) is movable and presses against the airbag (5).

5. A coal mine drilling grouting and sealing device according to claim 2, characterized in that: The limiting member (77) includes a connecting plate (7701) fixed to the top of the mounting bracket (1). The connecting plate (7701) has a connecting groove (7702) inside. The top and bottom of the connecting groove (7702) are provided with push plates (7703). A spring (7704) is fixedly connected between the two push plates (7703). A plug rod (7705) is fixedly connected to one side of each of the two push plates (7703). The inside of the first torsion ring (701) and the second torsion ring (709) are both provided with slots (7706) for use with the plug rod (7705).

6. A coal mine drilling grouting and sealing device according to claim 5, characterized in that: The connecting groove (7702) is fixedly connected to a limiting rod (7707), and the surface of the limiting rod (7707) is slidably connected to the inside of the push plate (7703).

7. A coal mine drilling grouting and sealing device according to claim 1, characterized in that: The bottom of the transmission rod (6) is fixedly connected to a limit ring (11), and both sides of the mounting bracket (1) are fixedly connected to mounting plates (12).

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