A light-curing device and method for coal seam gas extraction hole sealing

Abstract

The application discloses a kind of for coal seam gas extraction hole sealing light curing device and method, it is related to coal mine underground coal seam gas extraction process course.Volume is small, convenient to use and use effect is good, wherein, as high-cost component, light curing device can be repeatedly used, and the material consumed in use process is little, and construction cost is low.The light curing device includes fixed cover and solidifier;The fixed cover includes fixedly connected fixed cover body and gas extraction hole pipeline joint, and gas extraction pipe accommodating hole is formed in fixed cover body;The solidifier includes solidifier body, and a plurality of light curing resin spray heads and ultraviolet lamp beads are fixedly connected on the solidifier body, and solidifier sleeve and connecting ring are also fixedly connected at both ends of the solidifier body;The connecting ring and fixed cover body are detachably connected.It has remarkable significance for gas hole plugging and gas underground extraction engineering.

Description

Technical Field

[0001] This invention relates to the process of gas extraction from coal seams in underground coal mines, and particularly to a device and method for installing, setting up, fixing, and sealing the extraction pipelines of extraction holes in coal seams. Background Technology

[0002] During underground coal mining, the exposure of coal seams can easily lead to the outburst of gas trapped within them, resulting in underground disasters such as fires and explosions. Currently, domestic coal mines typically use gas drainage technology to extract gas from the coal seam to the surface for centralized treatment. This technology requires drilling holes in the coal seam and inserting drainage pipes, then using negative pressure pumps to pump the gas to the surface. However, due to the long drilling distances and loose borehole walls, directly inserting drainage pipes is difficult to fix, and it is impossible to create a closed space for effective gas extraction. Therefore, it is necessary to seal the borehole walls and fix the pipelines.

[0003] Existing technologies regarding gas sealing devices or methods include patent application 201520254392.4, which discloses a novel gas sealing bag; patent application 201310742075.2, which discloses a polyurethane gas sealing material for underground coal mines and its preparation method; and patent application 201910817222.5, which discloses a gas sealing device with pressure relief function. Existing technologies primarily use a sealing device to seal the gap between the extraction pipeline and the coal seam borehole wall, while simultaneously fixing the extraction pipeline, allowing it to extract gas from the coal seam. However, existing devices are generally large, difficult to operate, and fixed to the borehole wall once in use, making them impossible to remove afterward; or they require injecting large amounts of sealing material to fill the gap between the borehole wall and the pipeline, consuming significant manpower and resources.

[0004] In light of the above points, given the limited underground construction space, the methods described above are not actually widely applicable to the actual construction processes of various types of mines. Summary of the Invention

[0005] To address the above problems, this invention proposes a photocuring device and method for sealing coal seam gas extraction holes. It is small in size, easy to use, and has good performance. As a high-cost component, the photocuring device can be reused repeatedly, and it consumes less material and has low construction costs during use.

[0006] The technical solution of the present invention is as follows: the photocuring device includes a fixed cover and a curing unit; The fixed cover includes a fixed cover body 7 and a gas extraction hole pipe joint 10 that are fixedly connected to each other. A gas extraction pipe receiving hole 9 is provided in the fixed cover body 7. The curing unit includes a curing unit body 4, on which multiple light-curing resin nozzles 1 and ultraviolet lamp beads 2 are fixedly connected. The multiple light-curing resin nozzles 1 and ultraviolet lamp beads 2 are evenly distributed along the circumference of the curing unit body 4. Curing unit sleeves 11 and connecting rings 5 ​​are also fixedly connected to both ends of the curing unit body 4, respectively. The connecting rings 5 ​​and the fixed cover body 7 are detachably connected.

[0007] Regarding the position of the spray nozzle in the UV-curing resin nozzle 1: the outer diameter envelope of the tip of the UV-curing resin nozzle 1 is not larger than the coal seam gas hole; the UV-curing resin nozzle 1 includes two spray nozzles facing outwards from the connecting ring 5 and one spray nozzle facing outwards from the curing body 4.

[0008] Regarding the detachable connection structure of the fixed cover and the curing device: a magnetic cap groove 8 is provided on the end face of the fixed cover body 7, and a magnetic cap protrusion 6 that is adapted to the magnetic cap groove 8 is fixedly connected on the end face of the connecting ring 5. Furthermore, a magnet is provided inside the magnetic cap protrusion 6, and a chamfer is provided on one side of the magnetic cap protrusion 6.

[0009] Includes the following steps: Step 1: After the coal seam hole is prepared, the light curing device is inserted into the gas extraction pipe 12, and the gas extraction hole pipe joint 10 is fixed on the gas extraction pipe 12. The gas extraction pipe 12 is then inserted along the coal seam hole. Step 2: Determine the starting position and duration of photosensitive resin spraying based on the robustness coefficient of the coal seam borehole wall 15. After starting use, turn on the photocuring resin nozzle 1 and the ultraviolet lamp 2. Step 3: Advance the extraction pipe while keeping the photocurable resin nozzle 1 and UV lamp 2 open. According to the starting spray position and continuous distance determined in Step 2, advance the extraction pipe while spraying the photosensitive resin and complete the photocuring until the predetermined endpoint is reached, then turn off the photocurable resin nozzle 1 and UV lamp 2. Step 4: Rotate the curing tube 11 counterclockwise to separate the magnetic cap protrusion 6 from the magnetic cap groove 8, then pull the curing tube 11 to remove the curing unit and proceed with the subsequent extraction operation.

[0010] The apparatus and method of the present invention have achieved the following beneficial technical effects: I. The device of the present invention mainly utilizes the characteristics of photosensitive resin curing upon exposure to light and flowing under normal conditions. It can still be used normally even if there is no sunlight underground and no luminescent material in the coal seam pores. After the photosensitive resin adheres to the coal seam pore wall, it can penetrate inward along the pores, and the sealing effect is stronger after curing. The amount of photosensitive resin used to seal the coal seam pore wall is extremely small, and the preparation and transportation of materials during construction are simple and convenient.

[0011] Second, the main body of the device of the present invention is a light curing device. After a single coal seam hole is constructed, it can be taken out and used multiple times, which greatly reduces resource waste and is significantly different from the existing solutions. A single hole sealing only consumes one gas drainage hole fixing cover. In actual underground construction, carrying one light curing device and several gas drainage hole fixing covers can complete a large number of constructions, providing efficient on-site construction conditions.

[0012] Third, the construction method of this invention is simple, the operation process is short, and the fault tolerance rate is high. Since the switching and advancement of the main light curing nozzle lamp bead is controlled by the circuit, it can be expanded and programmed to realize mechanized one-button operation. It is more humane in on-site construction in coal mines, with low learning costs for workers and easy promotion.

[0013] IV. The effectiveness of this device and method in sealing gas pores in coal seams is affected by the coal seam's firmness coefficient and porosity, as well as the properties of the photosensitive resin and the construction distance. These influencing factors are quantifiable, easily calculated and tested, and variables can be adjusted, making it suitable for experimental research and targeted construction in special coal seams. It has significant implications for gas pore sealing and underground gas extraction projects. Attached Figure Description

[0014] Figure 1 This is a structural diagram of the fixed cover. Figure 2 yes Figure 1 The bottom view, Figure 3 This is a 3D view of the curing unit and the fixing cover after assembly. Figure 4 This is a schematic diagram of the curing device. Figure 5 This is a schematic diagram illustrating the implementation method of this case. Figure 6 This is a reference for the construction process in this case. Figure 1 , Figure 7 This is a reference for the construction process in this case. Figure 2 , Figure 8 This is a reference for the construction process in this case. Figure 3 ; In the figure: 1: UV-curing resin nozzle, 2: UV lamp bead, 3: Circular magnetic cap, 4: Curer body, 5: Connecting ring, 6: Magnetic cap knob, 11: Curer sleeve; 7: Fixed cover body; 8: Magnetic cap groove; 9: Gas extraction pipe receiving hole; 10: Gas extraction hole pipe joint. 12: Gas extraction pipe; 13: Ultraviolet light zone; 14: Photosensitive resin nozzle spray zone; 15: Coal seam borehole wall. Detailed Implementation

[0015] To clearly illustrate the technical features of this case, the following detailed explanation will be provided through specific implementation methods and in conjunction with the accompanying drawings.

[0016] The present invention is as follows Figure 1-5 As shown, it includes a detachably connected fixing cap and a curing device; Specifically: The fixing cover includes a fixing cover body 7 and a gas extraction hole pipe connector 10 that are fixedly connected. A gas extraction pipe receiving hole 9 is provided in the fixing cover body 7, and the gas extraction hole pipe connector 10 is fixedly connected to the gas extraction pipe 12. The gas extraction hole fixing cover in this case is a disposable fixing device used to fix the gas extraction pipe and simultaneously seal the gas extraction pipe opening and the coal seam hole below to prevent pressure leakage.

[0017] The curing device includes a curing device body 4, on which multiple photocurable resin nozzles 1 and ultraviolet lamp beads 2 are fixedly connected. These nozzles are evenly distributed circumferentially around the curing device body 4. A curing device sleeve 11 and a connecting ring 5 are fixedly connected to both ends of the curing device body 4. In use, the curing device sleeve 11 is slidably fitted onto the gas extraction pipe 12 and temporarily fixed to the fixing cover body 7 via the connecting ring 5. The gas sealing hole curing device is a reusable frustum-shaped element that can slide within the gas extraction pipe. Multiple photosensitive resin nozzles and ultraviolet lamp beads are installed on its outer side. The device is fixed to the gas extraction hole fixing cover by magnetic rotation. A sleeve rod is connected to the bottom of the device.

[0018] The photocurable resin nozzle 1 has 7 nozzles arranged equidistantly in a circle, and the outer diameter envelope of the nozzle tip is not larger than the coal seam gas hole; the photocurable resin nozzle 1 includes two spray ports facing the outside of the connecting ring 5 and one spray port facing the outside of the curing body 4.

[0019] The ultraviolet light beads 2 are seven in number and are arranged in a circular pattern at equal intervals; the ultraviolet light beads 2 are located next to the curing resin nozzle 1.

[0020] Regarding the detachable connection structure between the fixing cap and the curing unit: A magnetic cap groove 8 is provided on the end face of the fixed cover body 7. A magnetic cap protrusion 6, which is adapted to the magnetic cap groove 8, is fixedly connected to the end face of the connecting ring 5. A magnet is provided inside the magnetic cap protrusion 6, thereby forming a ring-shaped magnetic cap 3 at the connecting ring 5. In use, after all the magnetic cap protrusions 6 are inserted into the respective magnetic cap grooves 8, the two can be detachably connected under the influence of magnetic force.

[0021] A chamfer is provided on one side of the magnetic cap knob 6. In this way, when separating the fixing cap body 7 and the connecting ring 5, the curing tube 11 can be rotated counterclockwise first, so that the magnetic cap knob 6 and the magnetic cap groove 8 rotate relative to each other, and the chamfer will cause the two to separate from each other, so that the curing body 4 can be pulled out later.

[0022] This device can be used during the fixed construction of coal seam gas extraction pipelines. It is mainly used to fix the gas extraction pipeline inlet to a designated position and to seal the gas extraction pipeline and the outer coal seam borehole, creating negative pressure for gas extraction. Since coal seams are loose and porous materials, and the borehole walls are interconnected, making pressure loss easy, this device also needs to seal the borehole walls for a certain distance to prevent gas leakage and pressure loss, or to extract air from outside the coal seam borehole.

[0023] The method of using the present invention is as follows Figure 6-8 As shown, it includes the following steps: Step 1: After the coal seam hole is prepared, the light curing device is inserted into the gas extraction pipe 12, and the gas extraction hole pipe joint 10 is fixed on the gas extraction pipe 12. The gas extraction pipe 12 is then inserted along the coal seam hole. Step 2: Determine the starting position and duration of photosensitive resin spraying based on the robustness coefficient of the coal seam borehole wall 15. After starting use, turn on the photocuring resin nozzle 1 and the ultraviolet lamp 2. Step 3: Advance the extraction pipe while keeping the photocurable resin nozzle 1 and UV lamp 2 open. According to the starting spray position and continuous distance determined in Step 2, advance the extraction pipe while spraying the photosensitive resin and complete the photocuring until the predetermined endpoint is reached, then turn off the photocurable resin nozzle 1 and UV lamp 2. At this point, photosensitive resin will be evenly coated from the location of the fixing cover body 7 to the opening of the coal seam borehole, and then cured by light. Simultaneously, since the light-curing resin nozzle 1 includes two nozzles pointing outwards towards the connecting ring 5 and one nozzle pointing outwards towards the curing body 4, the space between the fixing cover body 7 and the coal seam borehole wall 15 will also be filled with photosensitive resin. Ultimately, this achieves the purpose of fixing the gas extraction pipeline, sealing the space between the gas extraction pipeline and the coal seam borehole, and partially blocking the coal seam borehole wall.

[0024] Step 4: Rotate the curing unit sleeve 11 counterclockwise to separate the magnetic cap protrusion 6 from the magnetic cap groove 8, then pull the curing unit sleeve 11 to remove the curing unit and proceed with normal extraction operations. After the curing unit is removed, the curing unit can still be reused.

[0025] There are many specific ways to implement this invention. The above description is only a preferred embodiment of this invention. It should be noted that for those skilled in the art, several improvements can be made without departing from the principle of this invention, and these improvements should also be considered within the scope of protection of this invention.

Claims

1. A method of using a photocuring device for sealing holes in coal seam gas extraction, characterized in that, The photocuring device includes a fixed cover and a curing unit; The fixed cover includes a fixed cover body (7) and a gas extraction hole pipe joint (10) that are fixedly connected. A gas extraction pipe receiving hole (9) is provided in the fixed cover body (7). The curing unit includes a curing unit body (4), on which multiple light-curing resin nozzles (1) and ultraviolet lamp beads (2) are fixedly connected. The multiple light-curing resin nozzles (1) and ultraviolet lamp beads (2) are evenly distributed along the circumference of the curing unit body (4). The two ends of the curing unit body (4) are also fixedly connected to a curing unit sleeve (11) and a connecting ring (5). The connecting ring (5) and the fixed cover body (7) are detachably connected. A magnetic cap groove (8) is provided on the end face of the fixed cover body (7). A magnetic cap protrusion (6) that is adapted to the magnetic cap groove (8) is fixedly connected on the end face of the connecting ring (5). A magnet is provided inside the magnetic cap protrusion (6). A chamfer is provided on one side of the magnetic cap protrusion (6). The method of using the light curing device includes the following steps: Step 1: After the coal seam hole is formed, the light curing device is inserted into the gas extraction pipe (12), and the gas extraction hole pipe joint (10) is fixed on the gas extraction pipe (12). The gas extraction pipe (12) is inserted along the coal seam hole. Step 2: Determine the starting position and duration of photosensitive resin spraying based on the robustness coefficient of the coal seam borehole wall (15). After starting use, turn on the photocurable resin nozzle (1) and the ultraviolet lamp (2). Step 3: Advance the extraction pipe and keep the photocurable resin nozzle (1) and ultraviolet lamp (2) open. According to the starting spray position and continuous distance determined in Step 2, advance the extraction pipe while spraying the photosensitive resin and complete the photocuring until the predetermined endpoint is reached, then turn off the photocurable resin nozzle (1) and ultraviolet lamp (2). Step 4: Rotate the curing tube (11) counterclockwise to separate the magnetic cap protrusion (6) from the magnetic cap groove (8), then pull the curing tube (11) to remove the curing unit and carry out subsequent extraction operations.

2. The method of using the photocuring device for sealing coal seam gas extraction holes according to claim 1, characterized in that, The outer diameter envelope of the tip of the light-curing resin nozzle (1) is not greater than that of the coal seam gas hole; the light-curing resin nozzle (1) includes two spray ports facing the outside of the connecting ring (5) and one spray port facing the outside of the curing body (4).

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