Automatic drainage device for downward drilling in coal mines

Abstract

This utility model belongs to the field of automatic drainage technology for underground drilling, and particularly relates to a drainage device for automatic blowing and drainage of coal mine downward drilling. It includes a compressed air system and a drainage system, as well as a compressed air pipe connected to the compressed air system and a drainage pipe connected to the drainage system. The end of the drainage pipe is equipped with an anti-clogging mechanism. This utility model adds an anti-clogging mechanism to the end of the existing drainage pipe, using a rotating anti-clogging head to deflect the blown coal slag, thereby preventing it from clogging the drainage pipe and avoiding downtime for cleaning. Furthermore, this utility model has a simple structure, is easy to manufacture, and can be improved upon based on existing technology, making it suitable for large-scale promotion and use.

Description

Technical Field

[0001] This utility model belongs to the field of automatic drainage technology for underground drilling, and in particular relates to a drainage device for automatic blowing and drainage of downward drilling in coal mines. Background Technology

[0002] Currently, the main method for controlling underground gas in coal mines is borehole gas extraction. As a fundamental measure for eliminating outbursts in mines and a primary way to reduce gas emissions in high-gas mines, removing water from the borehole is crucial for improving the effectiveness of gas extraction and ensuring borehole integrity. However, due to the poor cooling effect of pneumatic slag removal and the potential for generating harmful gases, hydraulic slag removal is often used in borehole construction. After drilling downwards, a large amount of water remains or seeps back into the borehole. Furthermore, in water-rich coal and rock strata, there is continuous seepage within the borehole, and it is difficult to completely drain the water from gas extraction boreholes at large angles and depths in one go.

[0003] Water accumulation in the downward drainage borehole not only blocks the gas escape channels in the borehole wall, but also, in soft coal seams, prolonged water accumulation can cause the borehole wall to become unstable due to soaking, leading to borehole collapse. Collapsed coal slag blocks the borehole drainage pipe, further affecting the gas drainage effect. In severe cases, the drainage borehole may fail directly, increasing gas drainage costs or leaving a gas drainage blank zone in the coal seam, creating a safety hazard during tunneling or mining.

[0004] To address these issues, a method was developed where drain pipes and blower pipes were inserted into the borehole. High-pressure gas was used to force the accumulated water along the drain pipes into a collection tank or steam-water separator, thus achieving forced drainage. However, because the borehole still contained a large amount of coal fragments, these fragments could clog the drain pipes. Although perforations were added to the existing drain pipes to reduce coal slag blockage, blockages still occurred, requiring periodic shutdowns to clean the drain pipes. Utility Model Content

[0005] This invention addresses the technical problem of drainage pipes in existing underground blasting and drainage devices being easily blocked by coal slag. It proposes a drainage device for automatic blasting and drainage of coal mine downholes that is reasonably designed, simple in structure, easy to process, and can effectively prevent coal slag blockage.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model provides an automatic drainage device for downward drilling in coal mines, including a compressed air system and a drainage system, as well as a compressed air pipe connected to the compressed air system and a drainage pipe connected to the drainage system. An anti-clogging mechanism is provided at the end of the drainage pipe. The anti-clogging mechanism includes a fixed frame fitted inside the drainage pipe and a drive shaft rotatably disposed in the middle of the fixed frame. One end of the drive shaft extends out of the drainage pipe and is connected to an anti-clogging head. The anti-clogging head includes a bullet-shaped anti-clogging head body and a lever disposed on the side wall of the anti-clogging head body. The lever is evenly distributed in a ring on the side wall of the anti-clogging head body and extends from the side wall of the anti-clogging head body to the outside of the drainage pipe. A drive impeller is also fitted on the drive shaft.

[0007] Preferably, two mounting brackets are fitted on the drive shaft, and the mounting brackets are located on both sides of the drive impeller.

[0008] Preferably, the fixing frame includes a bearing mounted on the drive shaft and a fixing ring mounted outside the bearing. A connecting rod is provided on the side wall of the fixing ring. The connecting rod is evenly distributed in a ring on the fixing ring. An arc-shaped fixing plate is provided at the end of the connecting rod away from the fixing ring. The arc-shaped fixing plate is fitted to the inner wall of the drain pipe.

[0009] Preferably, a water guide groove is also provided on the side wall of the anti-clogging head body.

[0010] Preferably, the water guide channel is located at the end near the anti-clogging head body.

[0011] Preferably, the water guide channel is disposed between two adjacent levers.

[0012] Preferably, the water guide channel is inclinedly disposed on the side wall of the anti-clogging head body.

[0013] Preferably, the drain pipe is also equipped with a liquid flow meter and a liquid level sensor.

[0014] Preferably, the system also includes a gas extraction system and an extraction pipe, wherein a gas flow meter is installed on the extraction pipe.

[0015] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0016] 1. This utility model provides an automatic drainage device for downward drilling in coal mines. By adding an anti-clogging mechanism to the end of the existing drainage pipe, the rotating anti-clogging head is used to move the coal slag that is blown in, thereby preventing it from clogging the drainage pipe and avoiding the need for machine shutdown for cleaning. At the same time, this utility model has a simple structure, is easy to process, and can be improved on the basis of the existing technology, making it suitable for large-scale promotion and use. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the drainage device for automatic blowing and drainage of coal mine downward boreholes provided in Example 1.

[0019] Figure 2 This is a schematic diagram of the structure of the drainage pipe provided in Example 1;

[0020] Figure 3 A schematic diagram of the anti-clogging mechanism provided in Example 1;

[0021] In the above figures, 1. Compressed air system; 11. Compressed air pipe; 2. Drainage system; 21. Drainage pipe; 22. Liquid flow meter; 23. Liquid level sensor; 3. Gas extraction system; 31. Extraction pipe; 32. Gas flow meter; 4. Anti-clogging mechanism; 41. Fixing frame; 411. Bearing; 412. Fixing ring; 413. Connecting rod; 414. Arc-shaped fixing plate; 42. Drive shaft; 43. Drive impeller; 44. Anti-clogging head; 441. Anti-clogging head body; 442. Toggle lever; 443. Water guide channel. Detailed Implementation

[0022] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0023] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0024] Example 1, as Figures 1-3As shown, this embodiment aims to avoid the problem of blockage in the drainage pipe 21 of the automatic drainage device for downward drilling in coal mines. To achieve the above objective, the drainage device for automatic drainage in downward drilling in coal mines provided in this embodiment includes a compressed air system 1 and a drainage system 2, as well as a compressed air pipe 11 connected to the compressed air system 1 and a drainage pipe 21 connected to the drainage system 2. It also includes a gas extraction system 3 and an extraction pipe 31. The above structure is a common structure of existing drainage devices, so it will not be described in detail in this embodiment.

[0025] Considering that the blockage of drain pipe 21 is caused by coal slag carried by the water flow, the blockage can be resolved by removing the coal slag to prevent it from approaching drain pipe 21. Furthermore, considering the high flow rate of the high-pressure air drainage, to fully utilize the characteristics of the water flow, an anti-blocking mechanism 4 is provided at the end of drain pipe 21 in this embodiment. Specifically, the anti-blocking mechanism 4 includes a fixing frame 41 fitted inside drain pipe 21 and a drive shaft 42 rotatably disposed in the middle of the fixing frame 41. The fixing frame 41 is mainly used to maintain the position of the entire anti-blocking mechanism 4. Therefore, in this embodiment, the fixing frame 41 includes a drive shaft 42 fitted inside the drive shaft 41. The bearing 411 on the 2 and the fixing ring 412 fitted outside the bearing 411 are provided. The fixing ring 412 is a short section of round tube. A connecting rod 413 is provided on the side wall of the fixing ring 412. The connecting rod 413 is a square rod and is evenly distributed in a ring on the fixing ring 412. Considering that the connecting rod 413 has a turbulent effect and will affect the water flow, only four connecting rods 413 are provided in this embodiment. The included angle between adjacent connecting rods 413 is 90°. An arc-shaped fixing plate 414 is provided at the end of the connecting rod 413 away from the fixing ring 412. The arc-shaped fixing plate 414 is mainly set to fit the inner wall of the drain pipe 21. Of course, the fixing bracket 41 and the drain pipe 21 are interference fit to ensure the stability of the fixing. At the same time, the setting of the bearing 411 also makes it easy for the drive shaft 42 to rotate. A drive impeller 43 is also mounted on the drive shaft 42. In this way, when the water flows into the drain pipe 21, it will drive the drive impeller 43 to rotate, thereby driving the drive shaft 42 to rotate.

[0026] To disperse the coal slag, in this embodiment, one end of the drive shaft 42 extends out of the drain pipe 21. An anti-clogging head 44 is connected to the end of the drive shaft 42 extending out of the drain pipe 21. The anti-clogging head 44 includes a bullet-shaped anti-clogging head body 441 and a lever 442 disposed on the side wall of the anti-clogging head body 441. The anti-clogging head body 441 can divert the water flowing from below and move it to the side. At the same time, the levers 442 are evenly distributed in a ring on the side wall of the anti-clogging head body 441. In this embodiment, four levers 442 are also provided. In this way, by rotating the levers 442, some large coal slags are knocked out, thereby avoiding blockage. To ensure no leaks, in this embodiment, the levers 442 extend from the side wall of the anti-clogging head body 441 to the outside of the drain pipe 21. A drive impeller 43 is also mounted on the drive shaft 42.

[0027] To ensure the stability of the entire anti-clogging mechanism 4, in this embodiment, two fixing brackets 41 are mounted on the drive shaft 42, and the fixing brackets 41 are located on both sides of the drive impeller 43. It should be noted that the fixing brackets 41 located between the drive impeller 43 and the anti-clogging head 44 should be close to the anti-clogging head 44 and far away from the drive impeller 43. This is because the structural design of the fixing brackets 41 cannot avoid the occurrence of turbulence. Therefore, to ensure the rotation effect of the drive impeller 43, it is better to keep them further away.

[0028] To increase the water intake, in this embodiment, a water guide groove 443 is also provided on the side wall of the anti-clogging head body 441. The water guide groove 443 is located near the end of the anti-clogging head body 441. The water guide groove 443 is positioned between two adjacent levers 442. Considering that the anti-clogging head body 441 is in a rotating state, the water guide groove 443 is inclinedly arranged on the side wall of the anti-clogging head body 441 to reduce turbulence and facilitate water intake.

[0029] To ensure drainage stability, in this embodiment, a liquid flow meter 22 and a liquid level sensor 23 are also installed on the drainage pipe 21. The liquid level sensor 23 is located near the anti-clogging head body 441, while the liquid flow meter 22 is located near the other end of the drainage pipe 21. Simultaneously, a gas flow meter 32 is installed on the extraction pipe 31. Thus, water accumulation monitoring and triggering are achieved: the liquid level sensor 23 monitors the water level in the borehole in real time, and when the water level exceeds a set threshold, the drainage procedure is triggered.

[0030] Gas monitoring trigger: By connecting to a gas flow monitor, the drainage program is activated when the flow rate is below a certain threshold, and deactivated when the flow rate is above or equal to a certain threshold. A timer program is set so that drainage begins when the flow rate is below the threshold. After running for a period of time, if the flow rate does not increase significantly or steadily, the drainage program is deactivated, proving that the low gas flow rate is not due to water issues.

[0031] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A drainage device for automatic blowing and drainage in downward drilling in coal mines, comprising a compressed air system and a drainage system, as well as a compressed air pipe connected to the compressed air system and a drainage pipe connected to the drainage system, characterized in that, The drain pipe is equipped with an anti-clogging mechanism at its end. The anti-clogging mechanism includes a fixed frame fitted inside the drain pipe and a drive shaft rotatably mounted in the middle of the fixed frame. One end of the drive shaft extends out of the drain pipe and is connected to an anti-clogging head. The anti-clogging head includes a bullet-shaped anti-clogging head body and a lever mounted on the side wall of the anti-clogging head body. The levers are evenly distributed in a ring on the side wall of the anti-clogging head body and extend from the side wall of the anti-clogging head body to the outside of the drain pipe. A drive impeller is also fitted on the drive shaft.

2. The drainage device for automatic blowing and drainage of coal mine downward drilling according to claim 1, characterized in that, Two mounting brackets are fitted onto the drive shaft, and the mounting brackets are located on both sides of the drive impeller.

3. The drainage device for automatic blowing and drainage of coal mine downward drilling according to claim 2, characterized in that, The fixing frame includes a bearing mounted on the drive shaft and a fixing ring mounted outside the bearing. A connecting rod is provided on the side wall of the fixing ring. The connecting rod is evenly distributed in a ring on the fixing ring. An arc-shaped fixing plate is provided at the end of the connecting rod away from the fixing ring. The arc-shaped fixing plate is fitted to the inner wall of the drain pipe.

4. The drainage device for automatic blowing and drainage of coal mine downward drilling according to claim 3, characterized in that, A water guide groove is also provided on the side wall of the anti-clogging head body.

5. The drainage device for automatic blowing and drainage of coal mine downward drilling according to claim 4, characterized in that, The water guide channel is located at the end near the anti-clogging head body.

6. The drainage device for automatic blowing and drainage of coal mine downward drilling according to claim 5, characterized in that, The water guide channel is located between two adjacent levers.

7. The drainage device for automatic blowing and drainage of coal mine downward drilling according to claim 6, characterized in that, The water guide channel is inclinedly installed on the side wall of the anti-clogging head body.

8. The drainage device for automatic blowing and drainage of coal mine downward boreholes according to any one of claims 1 to 7, characterized in that, The drain pipe is also equipped with a liquid flow meter and a liquid level sensor.

9. The drainage device for automatic blowing and drainage of coal mine downward drilling according to claim 8, characterized in that, It also includes a gas extraction system and an extraction pipe, on which a gas flow meter is installed.

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