Automatic drainage device and method for continuous extraction of downward crossing drill hole

Abstract

The invention discloses an automatic drainage device for continuous extraction of downward crossing drill holes, which comprises a drill pipe, a sealing grouting layer is poured in the middle of the drill pipe, and a fastening mechanism is mounted on the outer wall of the drill pipe; the device further comprises an extraction unit and a water pumping unit, the extraction unit is used for extracting gas in the drill pipe, and the water pumping unit is used for extracting accumulated water in the drill pipe. The invention further discloses a continuous extraction and automatic drainage method for the downward crossing drill hole. According to the automatic drainage device and method for continuous extraction of the towards-crossing drill hole, the problem that in the existing drainage operation process, the outer side of the extraction pipe and the water inlet are prone to being blocked is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of automatic drainage of underground boreholes, and in particular relates to an automatic drainage device for continuous extraction of downward through-layer boreholes, and also relates to an automatic drainage method for continuous extraction of downward through-layer boreholes. Background Art

[0002] At present, the main method of underground gas control in coal mines is drilling gas extraction, which is the fundamental measure for eliminating gas outbursts in coal mines and the main way to reduce gas outburst in high-gas mines. To improve the effect of drilling gas extraction, the integrity of the borehole must be guaranteed. In view of the cooling effect of wind slag removal and the generation of harmful gases, hydraulic slag removal is often used in the drilling construction process. After the downward drilling hole is formed, a large amount of water will remain or reversely seep out of the hole. In addition, due to the influence of the hydrogeological conditions in the coal mine, it is difficult to drain the water in the hole at one time during most downward hole extraction processes.

[0003] During the long-term gas extraction process, it was found that the outside of the extraction pipe was easily blocked by mud, which affected the gas extraction effect. In the process of extracting accumulated water, the water pipe was easily blocked by mud at the water inlet, which affected the extraction of accumulated water. The extracted accumulated water required additional screening treatment, affecting the overall working efficiency of the device. Summary of the invention

[0004] The purpose of the present invention is to provide an automatic drainage device for continuous extraction by downward through-layer drilling, which solves the problem that the outer side of the extraction pipe and the water inlet are easily blocked during the existing drainage operation.

[0005] Another object of the present invention is to provide a method for continuous extraction and automatic drainage of downward through-layer drilling holes.

[0006] The technical solution adopted by the present invention is an automatic drainage device for continuous extraction of downward through-layer drilling, including a drill pipe, a sealing grouting layer poured in the middle of the drill pipe, and a fastening mechanism installed on the outer wall of the drill pipe; it also includes an extraction unit and a pumping unit, the extraction unit is used to extract gas in the drill pipe, and the pumping unit is used to extract accumulated water in the drill pipe.

[0007] The present invention is also characterized in that: The extraction unit includes an extraction pipe, one end of which passes through the sealing grouting layer and extends to the bottom end of the drill pipe. An extraction pipe is fixed to the bottom of the extraction pipe. A plurality of extraction holes are evenly opened on the outer wall of the extraction pipe. A mud blocking mechanism is connected to the outer wall of the extraction pipe. The other end of the extraction pipe is connected to the extraction system.

[0008] The pumping unit includes a pumping pipe, one end of which passes through the sealing grouting layer and extends to the bottom end of the drill pipe. An anti-blocking mechanism is installed at the bottom of the pumping pipe. The other end of the pumping pipe is connected to a drain pipe through a connector. The other end of the drain pipe is connected to a collecting box. A pump is provided on the drain pipe, and a screening mechanism is provided in the collecting box.

[0009] The fastening mechanism comprises a support plate, which is arranged on the outer wall of the drill pipe, and a plurality of evenly distributed fastening plug rods are fixedly connected to the lower surface of the support plate.

[0010] The mud blocking mechanism includes a mud partition and a return spring. The bottom end of the mud partition is rotatably connected to the bottom end of the outer side surface of the extraction tube through a rotating shaft, and the top end of the mud partition is connected to the inner wall of the mud partition through a return spring.

[0011] A plurality of evenly distributed liquid level sensors are fixedly installed on the outer side of the bottom end of the water pumping pipe.

[0012] The anti-blocking mechanism comprises a rotating shaft, which is horizontally arranged on the inner wall of the bottom end of the water pumping pipe. The outer wall of the rotating shaft is sleeved with a mounting sleeve, and the outer wall of the mounting sleeve is fixedly connected with a plurality of rotating plates evenly and circumferentially distributed.

[0013] The screening mechanism includes a screen, and multiple rollers are provided on both sides of the screen. The screen is slidably connected to the inner wall of the collecting box through the multiple rollers. The inner wall of the collecting box is provided with two symmetrically distributed fixed plates, and the upper surfaces of the fixed plates are fixedly connected to limit rods. Two symmetrically distributed lifting grooves are provided on the side of the screen close to the fixed plate, and the two limit rods are inserted into the two lifting grooves one by one. The outer walls of the two limit rods are sleeved with rocking springs, one end of the two rocking springs is connected to the limit rod, and the other ends of the two rocking springs are connected to the screen.

[0014] Another technical solution adopted by the present invention is a method for continuous extraction and automatic drainage of downward through-layer drilling, comprising the following steps: S1. Determine the water level in the drill pipe through a liquid level sensor and extract the water through a water pump; S2, through the anti-blocking mechanism to break up the mud at the bottom of the pumping pipe, to ensure long-term extraction of accumulated water; S3. The accumulated water is screened and filtered through a screening mechanism to ensure that the accumulated water can be discharged for a long time. When the liquid level sensor detects that the accumulated water has been extracted, the water pump is turned off to complete the drainage.

[0015] The beneficial effects of the present invention are: The downward through-layer drilling continuous extraction automatic drainage device and method provided by the present invention reduces the possibility of mud clogging the extraction hole by setting a mud blocking mechanism. When the extraction pipe moves downward, the mud barrier can effectively block the external mud, reducing the possibility of mud clogging the extraction hole. In addition, due to the presence of the return spring, the mud barrier is prevented from fitting the extraction hole, thereby ensuring the normal extraction of gas and improving the practicability of the device. By setting an anti-clogging mechanism, mud is prevented from clogging the water pumping pipe during drainage, thereby improving the practicability of the device. During the pumping process, the mud at the bottom will enter the water pumping pipe and then contact the rotating plate. Due to the upward impact of the water flow, the rotating plate will continuously be driven to rotate, thereby achieving the effect of breaking up the mud. In this way, mud can be prevented from accumulating at the bottom of the pumping pipe, ensuring long-term extraction of accumulated water, and the liquid level sensor can be used to control the situation of accumulated water in real time, making it convenient for people to extract accumulated water; by setting up a screening mechanism, it is convenient to filter the collected accumulated water, reducing the steps of subsequent treatment of accumulated water, and improving the overall working efficiency of the device. After the accumulated water is collected, the accumulated water falls into the screen, and the screen is used to screen the accumulated water. The accumulated water will have a downward impact force on the screen, which will cause the screen to move downward, thereby achieving the effect of compressing the shaking spring. And due to the existence of the rebound force of the shaking spring, the screen will move up and down, which causes the screen to move in the vertical direction, achieving the effect of shaking the screen, thereby reducing the possibility of impurities clogging the screen, which is beneficial to the long-term treatment of accumulated water; by setting up a fastening mechanism, it is convenient to fix the drill pipe, and the shaking of the device is reduced during the gas extraction process, thereby reducing gas leakage and improving the safety performance of the device. When we use it, we insert the fastening rod into the ground, so as to provide auxiliary support for the drill pipe through the support plate, thereby improving the safety performance of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the automatic drainage device for continuous extraction by downward through-layer drilling of the present invention; Figure 2 yes Figure 1 Schematic diagram of the enlarged structure of the A area in the middle; Figure 3 It is a structural schematic diagram of the anti-blocking mechanism of the present invention; Figure 4 It is a schematic diagram of the structure of the collection box of the present invention; Figure 5 yes Figure 4 Schematic diagram of the enlarged structure of area B in the middle.

[0017] In the figure, 1. drill pipe; 2. extraction pipe; 3. sealing grouting layer; 4. fastening rod; 5. support plate; 6. extraction system; 7. extraction pipe; 8. drainage pipe; 9. connector; 10. collection box; 11. suction pipe; 12. liquid level sensor; 13. return spring; 14. extraction hole; 15. mud baffle; 16. rotating shaft; 17. rotating plate; 18. mounting sleeve; 19. screen; 20. roller; 21. lifting slot; 22. limit rod; 23. rocking spring; 24. fixing plate. DETAILED DESCRIPTION

[0018] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] The automatic drainage device for continuous extraction from downward through-layer drilling provided by the present invention is as follows: Figure 1 As shown, it includes a drill pipe 1, a sealing grouting layer 3 is poured in the middle of the drill pipe 1, and the sealing grouting layer 3 can reduce gas leakage, thereby improving the safety performance of the device. A fastening mechanism is installed on the outer wall of the drill pipe 1; it also includes an extraction unit and a pumping unit, the extraction unit is used to extract gas in the drill pipe 1, and the pumping unit is used to extract the accumulated water in the drill pipe 1; the extraction unit includes an extraction pipe 7, one end of the extraction pipe 7 passes through the sealing grouting layer 3 and extends to the bottom end of the drill pipe 1, and the bottom of the extraction pipe 7 is fixedly connected to an extraction pipe 2, as shown in FIG. Figure 2As shown, a plurality of extraction holes 14 are evenly opened on the outer wall of the extraction pipe 2, a mud blocking mechanism is connected to the outer wall of the extraction pipe 2, and the other end of the extraction pipe 7 is connected to the extraction system 6; the pumping unit includes a pumping pipe 11, one end of the pumping pipe 11 passes through the sealing grouting layer 3 and extends to the bottom end of the drill pipe 1, an anti-blocking mechanism is installed at the bottom of the pumping pipe 11, the other end of the pumping pipe 11 is connected to a drain pipe 8 through a connector 9, the other end of the drain pipe 8 is connected to a collecting box 10, a water pump is provided on the drain pipe 8, and a screening mechanism is provided in the collecting box 10; the fastening mechanism includes a support plate 5, the support plate 5 is provided on the outer wall of the drill pipe 1, and a plurality of evenly distributed fastening rods 4 are fixedly connected to the lower surface of the support plate 5, the drill pipe 1 can be fixed by the fastening mechanism, the shaking of the device is reduced during the gas extraction process, thereby reducing gas leakage and improving the safety of the device Performance, when in use, the fastening rod 4 is inserted into the ground, and the support plate 5 plays an auxiliary supporting role on the drill pipe 1; the mud blocking mechanism includes a mud barrier 15 and a return spring 13, the bottom end of the mud barrier 15 is rotatably connected to the bottom end of the outer side surface of the extraction tube 2 through a rotating shaft, and the top of the mud barrier 15 is connected to the inner wall of the mud barrier 15 through the return spring 13. The mud blocking mechanism reduces the possibility of mud blocking the extraction hole 14. When the extraction tube 7 moves downward, the mud barrier 15 can effectively block the external mud, reducing the probability of mud blocking the extraction hole 14, and due to the existence of the return spring 13, the mud barrier 15 is prevented from fitting to the extraction hole 14, thereby ensuring the normal extraction of gas and improving the practicability of the device; a plurality of evenly distributed liquid level sensors 12 are fixedly installed on the outside of the bottom end of the water extraction pipe 11. Figure 3 As shown, the anti-blocking mechanism includes a rotating shaft 16, which is horizontally arranged on the inner wall of the bottom end of the water pumping pipe 11. The outer wall of the rotating shaft 16 is sleeved with a mounting sleeve 18, and the outer wall of the mounting sleeve 18 is fixedly connected with a plurality of rotating plates 17 that are evenly and circumferentially distributed. The anti-blocking mechanism can prevent mud from clogging the water pumping pipe 11 during drainage, thereby improving the practicality of the device. During the process of pumping water, the mud at the bottom will enter the water pumping pipe 11 and then contact the rotating plate 17. Due to the upward impact of the water flow, the rotating plate 17 will be continuously driven to rotate, thereby achieving the effect of breaking up the mud, thereby preventing the mud from accumulating at the bottom end of the water pumping pipe 11, ensuring the long-term extraction of the accumulated water, and the level sensor 12 can be used to control the accumulated water situation in real time, making it convenient for people to extract the accumulated water. Figure 4 As shown, the screening mechanism includes a screen 19, and a plurality of rollers 20 are provided on both sides of the screen 19. The screen 19 is slidably connected to the inner wall of the collection box 10 through the plurality of rollers 20. Figure 5As shown, the inner wall of the collecting box 10 is provided with two symmetrically distributed fixing plates 24, the upper surfaces of the fixing plates 24 are fixedly connected to the limiting rods 22, and the side of the screen 19 close to the fixing plates 24 is provided with two symmetrically distributed lifting grooves 21, the two limiting rods 22 are inserted into the two lifting grooves 21 one by one, and the outer walls of the two limiting rods 22 are sleeved with shaking springs 23, one end of the two shaking springs 23 is connected to the limiting rods 22, and the other end of the two shaking springs 23 is connected to the screen 19, so that the collected accumulated water can be filtered through the screening mechanism, thereby reducing the steps of subsequent treatment of the accumulated water. The overall working efficiency of the device is improved. After the accumulated water is collected, the accumulated water falls into the screen 19, and the screen 19 is used to screen the accumulated water. The accumulated water will have a downward impact force on the screen 19, which will cause the screen 19 to move downward, thereby achieving the effect of compressing the rocking spring 23, and due to the existence of the rebound force of the rocking spring 23, the screen 19 will move up and down, which causes the screen 19 to move in the vertical direction, achieving the effect of rocking the screen 19, thereby reducing the possibility of impurities clogging the screen 19, which is conducive to the long-term treatment of accumulated water.

[0020] Example 1 The automatic drainage device for continuous extraction from downward through-layer drilling proposed in this embodiment is as follows: Figure 1 As shown, it includes a drill pipe 1, a sealing grouting layer 3 is poured in the middle of the drill pipe 1, and a fastening mechanism is installed on the outer wall of the drill pipe 1; it also includes an extraction unit and a pumping unit, the extraction unit is used to extract the gas in the drill pipe 1, and the pumping unit is used to extract the accumulated water in the drill pipe 1.

[0021] Example 2 The automatic drainage device for continuous extraction from downward through-layer drilling proposed in this embodiment is as follows: Figure 1 As shown, it includes a drill pipe 1, a sealing grouting layer 3 is poured in the middle of the drill pipe 1, and a fastening mechanism is installed on the outer wall of the drill pipe 1; it also includes an extraction unit and a pumping unit, the extraction unit is used to extract gas in the drill pipe 1, and the pumping unit is used to extract the accumulated water in the drill pipe 1; the extraction unit includes an extraction pipe 7, one end of the extraction pipe 7 passes through the sealing grouting layer 3 and extends to the bottom end of the drill pipe 1, and the bottom of the extraction pipe 7 is fixedly connected to the extraction pipe 2, as shown in FIG. Figure 2As shown, a plurality of extraction holes 14 are evenly opened on the outer wall of the extraction pipe 2, a mud blocking mechanism is connected to the outer wall of the extraction pipe 2, and the other end of the extraction pipe 7 is connected to the extraction system 6; the pumping unit includes a pumping pipe 11, one end of the pumping pipe 11 passes through the sealing grouting layer 3 and extends to the bottom end of the drill pipe 1, an anti-blocking mechanism is installed at the bottom of the pumping pipe 11, the other end of the pumping pipe 11 is connected to the drain pipe 8 through the connector 9, and the other end of the drain pipe 8 is connected to the collection box 10, and a pumping pump is provided on the drain pipe 8 to collect A screening mechanism is provided in the box 10; the fastening mechanism includes a support plate 5, which is provided on the outer wall of the drill pipe 1, and a plurality of evenly distributed fastening rods 4 are fixedly connected to the lower surface of the support plate 5; the mud blocking mechanism includes a mud barrier 15 and a return spring 13, the bottom end of the mud barrier 15 is rotatably connected to the bottom end of the outer side surface of the extraction pipe 2 through a rotating shaft, and the top end of the mud barrier 15 is connected to the inner wall of the mud barrier 15 through the return spring 13; a plurality of evenly distributed liquid level sensors 12 are fixedly installed on the outer side of the bottom end of the water pumping pipe 11.

[0022] Example 3 The automatic drainage device for continuous extraction from downward through-layer drilling proposed in this embodiment is as follows: Figure 1 As shown, it includes a drill pipe 1, a sealing grouting layer 3 is poured in the middle of the drill pipe 1, and a fastening mechanism is installed on the outer wall of the drill pipe 1; it also includes an extraction unit and a pumping unit, the extraction unit is used to extract gas in the drill pipe 1, and the pumping unit is used to extract the accumulated water in the drill pipe 1; the extraction unit includes an extraction pipe 7, one end of the extraction pipe 7 passes through the sealing grouting layer 3 and extends to the bottom end of the drill pipe 1, and the bottom of the extraction pipe 7 is fixedly connected to the extraction pipe 2, as shown in FIG. Figure 2 As shown, a plurality of extraction holes 14 are evenly opened on the outer wall of the extraction pipe 2, a mud blocking mechanism is connected to the outer wall of the extraction pipe 2, and the other end of the extraction pipe 7 is connected to the extraction system 6; the pumping unit includes a pumping pipe 11, one end of the pumping pipe 11 passes through the sealing grouting layer 3 and extends to the bottom end of the drill pipe 1, an anti-blocking mechanism is installed at the bottom of the pumping pipe 11, the other end of the pumping pipe 11 is connected to the drain pipe 8 through the connector 9, and the other end of the drain pipe 8 is connected to the collection box 10, and a pumping pump is provided on the drain pipe 8 to collect The box 10 is provided with a screening mechanism; the fastening mechanism includes a support plate 5, which is arranged on the outer wall of the drill pipe 1, and a plurality of evenly distributed fastening rods 4 are fixedly connected to the lower surface of the support plate 5; the mud blocking mechanism includes a mud barrier 15 and a return spring 13, the bottom end of the mud barrier 15 is rotatably connected to the bottom end of the outer side of the extraction pipe 2 through a rotating shaft, and the top end of the mud barrier 15 is connected to the inner wall of the mud barrier 15 through the return spring 13; a plurality of evenly distributed liquid level sensors 12 are fixedly installed on the outer side of the bottom end of the water extraction pipe 11. Figure 3 As shown, the anti-blocking mechanism includes a rotating shaft 16, which is horizontally arranged on the inner wall of the bottom end of the water pumping pipe 11. The outer wall of the rotating shaft 16 is sleeved with a mounting sleeve 18, and the outer wall of the mounting sleeve 18 is fixedly connected with a plurality of rotating plates 17 evenly and circumferentially distributed.

[0023] Example 4 The automatic drainage device for continuous extraction from downward through-layer drilling proposed in this embodiment is as follows: Figure 1 As shown, it includes a drill pipe 1, a sealing grouting layer 3 is poured in the middle of the drill pipe 1, and a fastening mechanism is installed on the outer wall of the drill pipe 1; it also includes an extraction unit and a pumping unit, the extraction unit is used to extract gas in the drill pipe 1, and the pumping unit is used to extract the accumulated water in the drill pipe 1; the extraction unit includes an extraction pipe 7, one end of the extraction pipe 7 passes through the sealing grouting layer 3 and extends to the bottom end of the drill pipe 1, and the bottom of the extraction pipe 7 is fixedly connected to the extraction pipe 2, as shown in FIG. Figure 2 As shown, a plurality of extraction holes 14 are evenly opened on the outer wall of the extraction pipe 2, a mud blocking mechanism is connected to the outer wall of the extraction pipe 2, and the other end of the extraction pipe 7 is connected to the extraction system 6; the pumping unit includes a pumping pipe 11, one end of the pumping pipe 11 passes through the sealing grouting layer 3 and extends to the bottom end of the drill pipe 1, an anti-blocking mechanism is installed at the bottom of the pumping pipe 11, the other end of the pumping pipe 11 is connected to the drain pipe 8 through the connector 9, and the other end of the drain pipe 8 is connected to the collection box 10, and a pumping pump is provided on the drain pipe 8 to collect The box 10 is provided with a screening mechanism; the fastening mechanism includes a support plate 5, which is arranged on the outer wall of the drill pipe 1, and a plurality of evenly distributed fastening rods 4 are fixedly connected to the lower surface of the support plate 5; the mud blocking mechanism includes a mud barrier 15 and a return spring 13, the bottom end of the mud barrier 15 is rotatably connected to the bottom end of the outer side of the extraction pipe 2 through a rotating shaft, and the top end of the mud barrier 15 is connected to the inner wall of the mud barrier 15 through the return spring 13; a plurality of evenly distributed liquid level sensors 12 are fixedly installed on the outer side of the bottom end of the water extraction pipe 11. Figure 3 As shown, the anti-blocking mechanism includes a rotating shaft 16, which is horizontally arranged on the inner wall of the bottom end of the water pumping pipe 11, and a mounting sleeve 18 is sleeved on the outer wall of the rotating shaft 16. A plurality of rotating plates 17 evenly and circumferentially distributed are fixedly connected to the outer wall of the mounting sleeve 18. Figure 4 As shown, the screening mechanism includes a screen 19, and a plurality of rollers 20 are provided on both sides of the screen 19. The screen 19 is slidably connected to the inner wall of the collection box 10 through the plurality of rollers 20. Figure 5 As shown, the inner wall of the collecting box 10 is provided with two symmetrically distributed fixed plates 24, and the upper surfaces of the fixed plates 24 are fixedly connected to the limiting rods 22. The side of the screen 19 close to the fixed plates 24 is provided with two symmetrically distributed lifting grooves 21, and the two limiting rods 22 are inserted into the two lifting grooves 21 one by one. The outer walls of the two limiting rods 22 are sleeved with rocking springs 23, one end of the two rocking springs 23 is connected to the limiting rod 22, and the other end of the two rocking springs 23 is connected to the screen 19.

[0024] Example 5 The method for continuous extraction and automatic drainage of downward through-layer drilling proposed in this embodiment includes the following steps: S1. Determine the water level in the drill pipe through a liquid level sensor and extract the water through a water pump; S2, through the anti-blocking mechanism to break up the mud at the bottom of the pumping pipe, to ensure long-term extraction of accumulated water; S3. The accumulated water is screened and filtered through a screening mechanism to ensure that the accumulated water can be discharged for a long time. When the liquid level sensor detects that the accumulated water has been extracted, the water pump is turned off to complete the drainage.

Claims

1. Downward through-layer drilling continuous extraction automatic drainage device, characterized in that: The drill pipe (1) comprises a sealing grouting layer (3) cast in the middle of the drill pipe (1), and a fastening mechanism installed on the outer wall of the drill pipe (1); and also comprises an extraction unit and a pumping unit, the extraction unit being used to extract gas in the drill pipe (1), and the pumping unit being used to extract accumulated water in the drill pipe (1).

2. The automatic drainage device for continuous extraction by downward drilling according to claim 1 is characterized in that: The extraction unit comprises an extraction pipe (7), one end of which penetrates the sealing grouting layer (3) and extends to the bottom end of the drill pipe (1), an extraction pipe (2) is fixedly connected to the bottom of the extraction pipe (7), a plurality of extraction holes (14) are evenly arranged on the outer wall of the extraction pipe (2), a mud blocking mechanism is connected to the outer wall of the extraction pipe (2), and the other end of the extraction pipe (7) is connected to the extraction system (6).

3. The automatic drainage device for continuous extraction by downward drilling according to claim 2 is characterized in that: The pumping unit comprises a pumping pipe (11), one end of the pumping pipe (11) penetrates the sealing grouting layer (3) and extends to the bottom end of the drill pipe (1), an anti-blocking mechanism is installed at the bottom of the pumping pipe (11), the other end of the pumping pipe (11) is connected to a drainage pipe (8) via a connector (9), the other end of the drainage pipe (8) is connected to a collection box (10), a pumping pump is provided on the drainage pipe (8), and a screening mechanism is provided in the collection box (10).

4. The automatic drainage device for continuous extraction by downward drilling according to claim 3 is characterized in that: The fastening mechanism comprises a support plate (5), the support plate (5) being arranged on the outer wall of the drill pipe (1), and a plurality of evenly distributed fastening rods (4) being fixedly connected to the lower surface of the support plate (5).

5. The automatic drainage device for continuous extraction by downward drilling according to claim 4 is characterized in that: The mud blocking mechanism comprises a mud barrier (15) and a return spring (13); the bottom end of the mud barrier (15) is rotatably connected to the bottom end of the outer side surface of the extraction tube (2) via a rotating shaft, and the top end of the mud barrier (15) is connected to the inner wall of the mud barrier (15) via a return spring (13).

6. The automatic drainage device for continuous extraction by downward drilling according to claim 5 is characterized in that: A plurality of evenly distributed liquid level sensors (12) are fixedly mounted on the outer side of the bottom end of the water pumping pipe (11).

7. The automatic drainage device for continuous extraction by downward drilling according to claim 6 is characterized in that: The anti-blocking mechanism comprises a rotating shaft (16), the rotating shaft (16) being horizontally arranged on the inner wall of the bottom end of the water pumping pipe (11), the outer wall of the rotating shaft (16) being sleeved with a mounting sleeve (18), and the outer wall of the mounting sleeve (18) being fixedly connected with a plurality of rotating plates (17) evenly and circumferentially distributed.

8. The automatic drainage device for continuous extraction by downward drilling according to claim 7 is characterized in that: The screening mechanism comprises a screen (19), a plurality of rollers (20) are provided on both sides of the screen (19), the screen (19) is slidably connected to the inner wall of the collection box (10) via the plurality of rollers (20), the inner wall of the collection box (10) is provided with two symmetrically distributed fixing plates (24), the upper surfaces of the fixing plates (24) are fixedly connected to limiting rods (22), the side of the screen (19) close to the fixing plates (24) is provided with two symmetrically distributed lifting grooves (21), the two limiting rods (22) are inserted into the two lifting grooves (21) in a one-to-one correspondence, the outer walls of the two limiting rods (22) are sleeved with shaking springs (23), one end of the two shaking springs (23) is connected to the limiting rod (22), and the other end of the two shaking springs (23) is connected to the screen (19).

9. A method for continuous extraction and automatic drainage by downward through-layer drilling, characterized in that: The use of the downward through-layer drilling continuous extraction automatic drainage device as claimed in claim 8 comprises the following steps: S1. Determine the water level in the drill pipe through a liquid level sensor and extract the water through a water pump; S2, through the anti-blocking mechanism to break up the mud at the bottom of the pumping pipe, to ensure long-term extraction of accumulated water; S3. The accumulated water is screened and filtered through a screening mechanism to ensure that the accumulated water can be discharged for a long time. When the liquid level sensor detects that the accumulated water has been extracted, the water pump is turned off to complete the drainage.

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