A kind of grouting device for coal mine gas drainage borehole plugging

Abstract

The utility model provides a kind of coal mine gas extraction drilling hole plugging's grouting device, including main pipeline, inner support fixed mechanism, outer bag and inner bag are sequentially provided with on main pipeline along its axial direction;The one end of main pipeline is close to inner bag and is provided with injection hole, the other end of main pipeline is provided with injection tube and grouting pipe, injection tube is communicated with injection hole, grouting pipe is communicated with the inside of main pipeline, grouting hole is evenly provided between inner bag and outer bag on main pipeline;Inner support fixed mechanism has the inner support plate that is circumferentially arrayed on the outside of main pipeline, main pipeline is provided with connecting rod driving assembly that drives inner support plate synchronous moves outward or inwards along its radial direction;In the utility model, inner support fixed mechanism is in abutment with the inner wall of drilling hole, provides support to main pipeline, avoid the axial slip of main pipeline inside drilling hole under the action of pressure, and avoid bag to be torn by rough hole wall.

Description

Technical Field

[0001] This utility model belongs to the field of coal mine equipment technology, specifically relating to a grouting device for sealing coal mine gas drainage boreholes. Background Technology

[0002] As coal mining depth increases, coal seam fracturing intensifies and gas pressure rises, making traditional gas drainage methods insufficient due to low coal seam permeability. Gas injection-enhanced gas drainage, which injects high-pressure gas into boreholes to displace gas, has become an important means of reducing gas pressure. However, this method places higher demands on borehole sealing performance and safety; simply sealing the borehole itself cannot effectively seal surrounding fractures, making it difficult to meet the sealing requirements for gas drainage.

[0003] In existing technologies, bladders are typically used to seal boreholes. When bladders are used to seal boreholes, they expand rapidly in the radial direction and adhere tightly to the borehole wall. This expansion process itself generates a huge static friction force between the outer wall of the bladder and the borehole wall. At the same time, the grouting pressure will cause the bladder to tend to move along the borehole axis. If the stability of the bladder cannot be guaranteed, the rough borehole wall can easily cut the bladder.

[0004] Therefore, it is necessary to design a grouting device for sealing coal mine gas drainage boreholes that can improve the stability of the gas bags and prevent the gas bags from being cut, in order to solve the current technical problems. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this utility model provides a grouting device for sealing coal mine gas drainage boreholes that can improve the stability of the gas bag and prevent the gas bag from being cut.

[0006] The technical solution of this utility model is as follows: a grouting device for sealing coal mine gas drainage boreholes, comprising a main pipeline, on which an inner support fixing mechanism, an outer bladder, and an inner bladder are sequentially arranged along its axial direction; an air injection hole is provided at one end of the main pipeline near the inner bladder, and an air injection pipe and a grouting pipe are provided at the other end of the main pipeline, the air injection pipe being connected to the air injection hole, and the grouting pipe being connected to the interior of the main pipeline; grouting holes are evenly distributed between the inner bladder and the outer bladder on the main pipeline; the inner support fixing mechanism has inner support plates arranged in a circumferential array on the outside of the main pipeline, and a connecting rod drive assembly is provided on the main pipeline to drive the inner support plates to move outward or retract inward synchronously along its radial direction.

[0007] Furthermore, the linkage drive assembly has two supporting links arranged parallel to each other on the inner support plate near the main pipe. One end of each supporting link is hinged to the inner support plate, and the other end is hinged to the main pipe. A drive ring is slidably fitted on the outer side of the main pipe. A drive link corresponding to the supporting link is hinged to one side of the drive ring. The end of the drive link facing away from the drive ring is hinged to the corresponding supporting link. A push nut is provided on the side of the drive ring facing away from the drive link to provide support. The push nut is threadedly connected to the main pipe.

[0008] Furthermore, the inner support plate is an arc-shaped plate structure, and several anchor blocks are evenly arranged on the outer side of the inner support plate.

[0009] Furthermore, a washer is fitted on the outer side of the main pipe between the push nut and the drive ring.

[0010] Furthermore, a hexagonal block is fixedly installed on one end of the main pipe near the inner support fixing mechanism.

[0011] Furthermore, the outer and inner pouches are filled with an expanding agent.

[0012] Furthermore, the distance between the inner and outer pouches is 5-8m.

[0013] The beneficial effects of this utility model are: (1) In this utility model, the inner support fixing mechanism abuts against the inner wall of the borehole to provide support for the main pipe, thereby preventing the main pipe from sliding axially inside the borehole under pressure and preventing the bag from being cut by the rough hole wall. (2) The gas injection pipe extends inside the main pipeline to the position where it connects with the gas injection hole. Gas is injected through the gas injection pipe, and the gas flow flows out from the gas injection hole and into the borehole to realize the injection of gas into the coal seam. (3) Grout can be injected into the main pipeline through the grouting pipe. The grout flows out from the grouting hole and enters the fracture area around the borehole between the inner and outer bladders. Attached Figure Description

[0014] Figure 1 This is one of the structural schematic diagrams of the grouting device for sealing coal mine gas drainage boreholes in this utility model.

[0015] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle.

[0016] Figure 3 This is the second schematic diagram of the grouting device for sealing coal mine gas drainage boreholes in this utility model. Detailed Implementation

[0017] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The descriptions of the exemplary embodiments are merely illustrative and are not intended to limit the present invention or its application or use in any way. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present invention thorough and complete, and to fully express the scope of the present invention to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, the composition of materials, numerical expressions, and values ​​set forth in these embodiments should be interpreted as merely exemplary and not as limiting.

[0018] The terms "first," "second," and similar words used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Words such as "including" or "comprising" mean that the element preceding the word encompasses the element listed after it, and do not exclude the possibility of encompassing other elements as well. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0019] like Figures 1 to 3 As shown, a grouting device for sealing coal mine gas drainage boreholes is disclosed, including a main pipe 1. An inner support fixing mechanism 4, an outer bladder 3, and an inner bladder 2 are sequentially arranged along the axial direction of the main pipe 1. An air injection hole 11 is provided at one end of the main pipe 1 near the inner bladder 2, and an air injection pipe 5 and a grouting pipe 6 are provided at the other end of the main pipe 1. The air injection pipe 5 is connected to the air injection hole 11, and the grouting pipe 6 is connected to the interior of the main pipe 1. Grouting holes 12 are evenly opened between the inner bladder 2 and the outer bladder 3 on the main pipe 1. The inner support fixing mechanism 4 has an inner support plate 41 arranged in a circumferential array on the outside of the main pipe 1. A connecting rod drive assembly is provided on the main pipe 1 to drive the inner support plate 41 to move outward or retract inward synchronously along its radial direction.

[0020] In this embodiment, the grouting device for sealing coal mine gas drainage boreholes is first inserted into the borehole during installation. The inner support plate 41 is then driven to move radially outwards synchronously via the connecting rod drive assembly, causing it to abut tightly against the inner wall of the borehole. The main pipe 1 is then fixed inside the borehole by the inner support fixing mechanism 4. Next, the inner bladder 2 and outer bladder 3 are inflated to seal the connection between the two ends of the main pipe 1 and the borehole. The air injection pipe 5 extends inside the main pipe 1 to a position connecting with the air injection hole 11. Gas is injected through the gas injection pipe 5, and the gas flow flows out from the gas injection hole 11 into the borehole to inject gas into the coal seam; grout is injected into the main pipeline 1 through the grouting pipe 6, and the grout flows out from the grouting hole 12 into the fracture area around the borehole between the inner bag 2 and the outer bag 3; the inner support fixing mechanism 4 abuts against the inner wall of the borehole to provide support for the main pipeline 1, preventing the main pipeline 1 from sliding axially inside the borehole under pressure, and preventing the bags from being cut by the rough borehole wall.

[0021] In some embodiments, such as Figure 3 As shown, the linkage drive assembly has two parallel support rods 43 arranged on the inner support plate 41 near the main pipe 1. One end of the support rod 43 is hinged to the inner support plate 41, and the other end of the support rod 43 is hinged to the main pipe 1. A drive ring 45 is slidably fitted on the outer side of the main pipe 1. A drive rod 44 corresponding to the support rod 43 is hinged to one side of the drive ring 45. The end of the drive rod 44 facing away from the drive ring 45 is hinged to the corresponding support rod 43. The end of the drive ring 45 facing away from the drive rod 44 is hinged to the support rod 43. A push nut 46 is provided to provide support. The push nut 46 is threaded to the main pipe 1. The main pipe 1 is provided with an external thread that matches the push nut 46. During installation, the grouting device for sealing the coal mine gas drainage borehole is inserted into the borehole. The push nut 46 is rotated on the outside of the main pipe 1. The push nut 46 pushes the drive ring 45 to move closer to the outer bladder 3. The drive connecting rod 44 pushes the support connecting rod 43 to swing. The support connecting rod 43 pushes the inner support plate 41 to move outward and abut against the inner wall of the borehole to achieve fixation.

[0022] In some embodiments, the inner support plate 41 is an arc-shaped plate structure, which can increase the contact area with the inner wall of the borehole and increase the friction. A plurality of anchor blocks 42 are uniformly arranged on the outer side of the inner support plate 41. The anchor blocks 42 are triangular structures that can be embedded in the inner wall of the borehole, further improving the stability of the support between the inner support plate 41 and the inner wall of the borehole.

[0023] In some embodiments, a washer 47 is fitted on the outside of the main pipe 1 between the push nut 46 and the drive ring 45; when the push nut 46 is rotated to adjust, the push nut 46 contacts the washer 47 instead of directly contacting the drive ring 45, which can reduce the wear of the push nut 46 on the drive ring 45.

[0024] In some embodiments, a hexagonal block 13 is fixedly provided on one end of the main pipe 1 near the inner support fixing mechanism 4; the hexagonal block 13 is convenient to be clamped and fixed by a wrench, so as to fix the main pipe 1 to rotate and adjust the push nut 46.

[0025] In some embodiments, the outer bag 3 and the inner bag 2 are filled with an expanding agent; both the outer bag 3 and the inner bag 2 are elastic bags, and the expanding agent inside the elastic bag can quickly generate gas, causing the elastic bag to expand and seal the borehole.

[0026] In some embodiments, the distance between the inner bag and the outer bag is 5 to 8 meters.

[0027] The various embodiments of this utility model have now been described in detail. To avoid obscuring the concept of this utility model, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0028] The embodiments described above only illustrate some implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A grouting device for sealing coal mine gas drainage boreholes, characterized in that: The main pipe includes an inner support fixing mechanism, an outer bladder, and an inner bladder, which are sequentially arranged along its axial direction. An air injection hole is provided at one end of the main pipe near the inner bladder, and an air injection pipe and a grouting pipe are provided at the other end of the main pipe. The air injection pipe is connected to the air injection hole, and the grouting pipe is connected to the interior of the main pipe. Grouting holes are evenly provided between the inner bladder and the outer bladder on the main pipe. The internal support fixing mechanism has internal support plates arranged in a circular array on the outside of the main pipe, and the main pipe is provided with a linkage drive assembly that drives the internal support plates to move outward or retract inward synchronously along its radial direction.

2. The grouting device for sealing coal mine gas drainage boreholes according to claim 1, characterized in that: The linkage drive assembly has two parallel support rods arranged on the inner support plate near the main pipe. One end of each support rod is hinged to the inner support plate, and the other end is hinged to the main pipe. A drive ring is slidably fitted on the outside of the main pipe. A drive rod corresponding to the support rod is hinged to one side of the drive ring. The end of the drive rod facing away from the drive ring is hinged to the corresponding support rod. A push nut is provided on the side of the drive ring facing away from the drive rod to provide support. The push nut is threadedly connected to the main pipe.

3. The grouting device for sealing coal mine gas drainage boreholes according to claim 2, characterized in that: The inner support plate is an arc-shaped plate structure, and several anchor blocks are evenly arranged on the outer side of the inner support plate.

4. The grouting device for sealing coal mine gas drainage boreholes according to claim 2, characterized in that: A washer is fitted on the outside of the main pipe between the push nut and the drive ring.

5. The grouting device for sealing coal mine gas drainage boreholes according to claim 2, characterized in that: A hexagonal block is fixedly installed on one end of the main pipe near the internal support fixing mechanism.

6. The grouting device for sealing coal mine gas drainage boreholes according to claim 1, characterized in that: The outer and inner pouches are filled with an expanding agent.

7. The grouting device for sealing coal mine gas drainage boreholes according to claim 1, characterized in that: The distance between the inner and outer sacs is 5-8m.

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