Water injection and slag discharge device for coal mine drilling

Abstract

The water injection and deslagging device comprises a drill bit assembly, the bottom of the drill bit assembly is connected with a drill rod through a drill bit sealing connection female buckle, the interior of the drill rod is of a hollow structure, and a water inlet pipe leading into the drill bit assembly is arranged in the center of the drill rod. A water return channel is formed between the outer wall of the water inlet pipe and the inner wall of the drill rod and fixed through a supporting rod, a water return opening is formed in the side wall of the side, close to the drill bit assembly, of the drill rod and covered with a filter screen, and a water return discharging opening is formed in the side, away from the drill bit assembly, of the water return channel. A sealing baffle used for blocking the water return channel is arranged below the water return outlet, and the outer side of the water return outlet is coated with a bearing water return assembly. A bearing water injection assembly is arranged below the sealing baffle; the bottom of the drill rod is connected to a driving motor. The drilling efficiency can be effectively improved, secondary utilization of circulating water is facilitated, and water saving in the drilling process is facilitated.

Description

Technical Field

[0001] This utility model relates to the technical field of slag removal devices, and in particular to a water injection slag removal device for coal mine drilling. Background Technology

[0002] Coal still occupies an important proportion of my country's energy structure, and the demand for coal remains high due to the development of the national economy. High-gas and coal and gas outburst mines face pressure to increase production. With the continuous increase in mining depth, more and more mines are becoming high-gas and outburst-prone mines. Borehole gas drainage, as a basic measure for preventing outbursts and controlling gas, is widely used in high-gas and outburst-prone mines. However, the drainage rate of pre-drainage of coal seams is mostly less than 30%. In order to meet the drainage standards, most mines have problems such as long pre-drainage time and large amount of drilling work.

[0003] Pre-drainage of coal seam gas mainly relies on inherent fractures within the coal seam to extract gas through boreholes. This method suffers from drawbacks such as a small borehole influence range and generally low gas extraction rates. Therefore, it is necessary to enhance the permeability of the coal seam within the borehole section to increase the influence range, reduce coal seam stress, and improve gas extraction efficiency. Hydraulic borehole enlargement and high-pressure hydraulic fracturing are widely used as pressure relief and permeability enhancement measures; however, current technologies lack devices for easily recycling and reusing circulating water, leading to potential water resource waste. Summary of the Invention

[0004] The purpose of this invention is to provide a water injection and slag removal device for coal mine drilling, which can effectively improve drilling efficiency, facilitate the secondary use of circulating water, and help save water during the drilling process.

[0005] To achieve the above objectives, this utility model provides a water injection and slag removal device for coal mine drilling, including a drill bit assembly. A drill rod is connected to the bottom of the drill bit assembly via a drill bit sealing connector. The drill rod has a hollow internal structure. A water inlet pipe is located at the center of the drill rod, leading into the drill bit assembly. A return water channel is formed between the outer wall of the water inlet pipe and the inner wall of the drill rod and is fixed by a support rod. A return water port is provided on the side wall of the drill rod near the drill bit assembly, and a filter screen is provided at the return water port. A return water outlet is provided on the side of the return water channel away from the drill bit assembly. A sealing baffle is provided below the return water outlet to block the return water channel. A bearing return water assembly is wrapped around the outside of the return water outlet. A bearing water injection assembly is provided below the sealing baffle. The bottom of the drill rod is connected to a drive motor.

[0006] Preferably, the drill bit assembly includes a drill bit housing, inside which a nozzle body is provided. A displacement channel is formed inside the nozzle body, and the outer side of the displacement channel communicates with the water inlet pipe. Low-pressure water inlets and high-pressure water inlets are provided on both sides of the displacement channel. The low-pressure water inlet communicates with a low-pressure water spray channel located inside the nozzle body and extends to the front end of the nozzle body. The high-pressure water inlet communicates with a high-pressure water spray channel located inside the nozzle body and extends to both sides of the nozzle body. A high-pressure nozzle connected to the high-pressure water spray channel is provided on the side of the drill bit housing. A high-low pressure mode switching component is provided within the displacement channel.

[0007] Preferably, the high / low pressure mode switching component includes a slide valve disposed within the shifting channel, with sliders on both sides of the slide valve and sliding grooves on both sides of the shifting channel matching the sliders; a low-pressure valve port matching the low-pressure water port and a high-pressure valve port matching the high-pressure water port are respectively opened on both sides of the slide valve; a return spring is disposed between the inner outer end of the slide valve and the shifting channel.

[0008] Preferably, the front end of the drill bit housing is provided with a drill bit synapse.

[0009] Preferably, the bearing return water assembly includes a bearing return water sealing sleeve covering the drill pipe, and a drain pipe is connected to one side of the bearing return water sealing sleeve. A quick-release filter and a water pump are successively installed on the drain pipe.

[0010] Preferably, the bearing water injection assembly includes a bearing water injection sealing sleeve covering the drill rod, and a water injection pipe is provided on one side of the bearing water injection sealing sleeve; a water inlet groove is provided on the drill rod located inside the bearing water injection sealing sleeve, and a plurality of water inlet holes are provided on the water inlet groove, and the water inlet holes are connected to the water inlet pipe.

[0011] Therefore, the above-mentioned water injection and slag removal device for coal mine drilling can effectively improve drilling efficiency, facilitate the secondary use of circulating water, and help save water during the drilling process.

[0012] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of a water injection and slag removal device for coal mine drilling in low-pressure water spray mode.

[0014] Figure 2 This is an enlarged view of point A;

[0015] Figure 3This is a cross-sectional view of a water injection and slag removal device for coal mine drilling in high-pressure water spray mode.

[0016] Figure 4 This is an enlarged view of point B;

[0017] Figure 5 This is a schematic cross-sectional view of the drill rod of a water injection and slag removal device for coal mine drilling according to this utility model.

[0018] Figure Labels

[0019] 1. Drill bit assembly; 11. Drill bit housing; 12. Nozzle body; 13. Shifting channel; 14. Slide valve; 141. Low-pressure valve port; 142. High-pressure valve port; 15. Slide groove; 16. Slider; 17. Return spring; 18. Low-pressure water inlet; 181. Low-pressure water spray channel; 19. High-pressure water inlet; 191. High-pressure water spray channel; 192. High-pressure nozzle; 120. Drill bit contact; 2. Drill bit sealing connection nut; 3. Drill rod; 31. Inlet pipe; 32. Return water channel; 33. Support rod; 34. Return water inlet; 35. Filter screen; 36. Return water outlet; 37. Sealing baffle; 38. Inlet groove; 39. Inlet hole; 4. Bearing return water sealing sleeve; 41. Drain pipe; 42. Quick-release filter; 43. Water pump; 5. Bearing water injection sealing sleeve; 51. Water injection pipe; 6. Drive motor. Detailed Implementation

[0020] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0021] Unless otherwise defined, the technical or scientific terms used in this utility model shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0022] Example 1

[0023] like Figure 1 As shown, this utility model provides a water injection and slag removal device for coal mine drilling, including a drill bit assembly 1, as shown. Figure 2As shown, the drill bit assembly 1 includes a drill bit housing 11, inside which a nozzle body 12 is provided. A displacement channel 13 is formed inside the nozzle body 12, and the outer side of the displacement channel 13 is connected to a water inlet pipe 31. Low-pressure water inlets 18 and high-pressure water inlets 19 are provided on both sides of the displacement channel 13. The low-pressure water inlet 18 is connected to a low-pressure water jet channel 181 located inside the nozzle body 12 and extends to the front end of the nozzle body 12; the high-pressure water inlet 19 is connected to a high-pressure water jet channel 191 located inside the nozzle body 12 and extends to both sides of the nozzle body 12. A high-pressure nozzle 192 connected to the high-pressure water jet channel 191 is provided on the side of the drill bit housing 11.

[0024] A high / low pressure mode switching component is installed within the shift channel 13. This component includes a slide valve 14 within the shift channel 13, with sliders 16 on both sides of the slide valve 14. Slide grooves 15 on both sides of the shift channel 13 match the sliders 16. A low-pressure valve port 141 matching the low-pressure water inlet 18 and a high-pressure valve port 142 matching the high-pressure water inlet 19 are respectively opened on both sides of the slide valve 14. A return spring 17 is installed between the inner and outer ends of the slide valve 14 and the shift channel 13. This spring automatically controls the position of the slide valve 14 according to the water pressure in the inlet pipe 31, thereby connecting the inlet pipe 31 to either the low-pressure spray channel 181 or the high-pressure spray channel 191, thus enabling the switching between high and low pressure spray modes.

[0025] When the pressure inside the inlet pipe 31 is low, the water pressure is insufficient to push the slide valve 14 to provide enough pressure to the return spring, thereby connecting the low-pressure valve port 141 on the slide valve 14 with the low-pressure water spray channel 181, thus realizing the low-pressure water spray mode of the drill bit assembly 1. Figure 1 and Figure 2 As shown, the front end of the drill bit housing 11 is provided with a drill bit protrusion 120, which facilitates faster destruction of the coal seam in front of the drill bit assembly 1, thereby improving work efficiency. At the same time, due to the presence of low-pressure water in front, a water film can be provided between the drill bit protrusion 120 and the coal seam contact surface, which can reduce wear on the drill bit to a certain extent while cooling it down.

[0026] When the pressure inside the water inlet pipe 31 increases, the water pressure provides sufficient pressure to push the slide valve 14 against the return spring, causing the slide valve 14 to slide forward. This connects the high-pressure valve port 142 on the slide valve 14 with the high-pressure water jet channel 191, thereby realizing the high-pressure water jet mode of the drill bit assembly 1. Figure 3 and Figure 4 As shown. The high-pressure water jet ejected from the high-pressure nozzle 192 can effectively destroy the coal seams on both sides of the drill bit assembly 1, thereby achieving efficient slag removal during the drilling process.

[0027] The bottom of the drill bit assembly 1 is connected to the drill rod 3 via the drill bit sealing connector 2. The drill rod 3 has a hollow internal structure, and a water inlet pipe 31 leading into the drill bit assembly 1 is located at the center of the drill rod 3. The outer wall of the water inlet pipe 31 and the inner wall of the drill rod 3 form a return water channel 32, which is fixed by a support rod 33. Figure 5 As shown, a water return port 34 is provided on the side wall of the drill rod 3 near the drill bit assembly 1 for recycling the water sprayed from the drill bit assembly 1. A filter screen 35 covers the water return port 34 to prevent large amounts of coal slag from entering the water return channel 32 and causing blockage. If there is any clogging coal slag, it can be ground away as the drill rod 3 rotates.

[0028] like Figure 1 As shown, a return water outlet 36 is provided on the side of the return water channel 32 away from the drill bit assembly 1. A sealing baffle 37 for blocking the return water channel 32 is provided below the return water outlet 36. A bearing return water assembly is wrapped around the outside of the return water outlet 36. The bearing return water assembly includes a bearing return water sealing sleeve 4 wrapped around the drill rod 3. While achieving a seal, it does not rotate synchronously with the drill rod 3, which facilitates the collection of return water. This structure is all existing technology and can be referred to as the bearing sealing sleeve on the water drill water injector, so it will not be described in detail here.

[0029] A drain pipe 41 is connected to one side of the bearing return water sealing sleeve 4. A quick-release filter 42 and a water pump 43 are installed on the drain pipe 41. The quick-release filter 42 can easily filter the recovered water, and the water pump 43 can create negative pressure in the return water channel 32, which facilitates better return of water from the borehole to the return water channel 32, thereby improving the recovery efficiency of the circulating water.

[0030] Below the sealing baffle 37, a bearing water injection assembly is provided. This assembly includes a bearing water injection sealing sleeve 5 covering the drill rod 3, with a structure similar to the bearing return water sealing sleeve 4. A water injection pipe 51 is provided on one side of the bearing water injection sealing sleeve 5 for injecting water into it. A water inlet groove 38 is provided on the drill rod 3 inside the bearing water injection sealing sleeve 5, and several water inlet holes 39 are provided on the groove. These holes 39 communicate with the water inlet pipe 31 and are connected to the water injection pipe 51 via an external water supply device, enabling water supply to the drill bit assembly 1. The bottom of the drill rod 3 is connected to a drive motor 6, which provides power output for the rotation of the drill rod 3 and the forward movement of the drill bit assembly 1.

[0031] Therefore, the above-mentioned water injection and slag removal device for coal mine drilling can effectively improve drilling efficiency, facilitate the secondary use of circulating water, and help save water during the drilling process.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solution of this utility model, and these modifications or equivalent substitutions cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of this utility model.

Claims

1. A water injection and slag removal device for coal mine drilling, characterized in that: The system includes a drill bit assembly. A drill rod is connected to the bottom of the drill bit assembly via a drill bit sealing connector. The drill rod has a hollow interior. A water inlet pipe is located at the center of the drill rod, leading into the drill bit assembly. A return water channel is formed between the outer wall of the water inlet pipe and the inner wall of the drill rod and is fixed by a support rod. A return water port is located on the side wall of the drill rod closest to the drill bit assembly, and a filter screen is installed at the return water port. A return water outlet is located on the side of the return water channel furthest from the drill bit assembly. A sealing baffle is located below the return water outlet to block the return water channel. A bearing return water assembly is installed on the outside of the return water outlet. A bearing water injection assembly is located below the sealing baffle. The bottom of the drill rod is connected to a drive motor.

2. The water injection and slag removal device for coal mine drilling according to claim 1, characterized in that: The drill bit assembly includes a drill bit housing, inside which is a nozzle body. A displacement channel is formed inside the nozzle body, and the outer side of the displacement channel communicates with the water inlet pipe. Low-pressure and high-pressure water inlets are provided on both sides of the displacement channel. The low-pressure water inlet communicates with a low-pressure water spray channel located inside the nozzle body and extends to the front end of the nozzle body. The high-pressure water inlet communicates with a high-pressure water spray channel located inside the nozzle body and extends to both sides of the nozzle body. A high-pressure nozzle connected to the high-pressure water spray channel is provided on the side of the drill bit housing. A high-low pressure mode switching component is provided within the displacement channel.

3. A water injection and slag removal device for coal mine drilling according to claim 2, characterized in that: The high / low pressure mode switching component includes a slide valve disposed in the shifting channel. Slides are disposed on both sides of the slide valve, and sliding grooves matching the slides are disposed on both sides of the shifting channel. A low-pressure valve port matching the low-pressure water port and a high-pressure valve port matching the high-pressure water port are respectively opened on both sides of the slide valve. A return spring is disposed between the inner outer end of the slide valve and the shifting channel.

4. A water injection and slag removal device for coal mine drilling according to claim 2, characterized in that: The front end of the drill bit housing is provided with a drill bit synapse.

5. A water injection and slag removal device for coal mine drilling according to claim 1, characterized in that: The bearing return water assembly includes a bearing return water sealing sleeve covering the drill pipe. A drain pipe is connected to one side of the bearing return water sealing sleeve, and a quick-release filter and a water pump are installed sequentially on the drain pipe.

6. A water injection and slag removal device for coal mine drilling according to claim 1, characterized in that: The bearing water injection assembly includes a bearing water injection sealing sleeve covering the drill rod, and a water injection pipe is provided on one side of the bearing water injection sealing sleeve; a water inlet groove is provided on the drill rod located inside the bearing water injection sealing sleeve, and a plurality of water inlet holes are provided on the water inlet groove, and the water inlet holes are connected to the water inlet pipe.

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