Water pressure triggered mine ultra-high pressure horizontal cutting device

Abstract

The present application relates to a kind of water pressure trigger type mine ultra-high pressure horizontal cut layer device, belong to coal mine gas extraction technical field.The shell and the high-pressure pipe of rotation setting in shell are included, two nozzles are uniformly distributed along the circumference of high-pressure pipe, multiple jet holes are opened in the circumference of shell corresponding to nozzle, the fluid outlet one end of high-pressure pipe is connected with hollow valve seat, valve seat is installed with valve body, valve body is equipped with valve core with spring, the preset elastic force of spring makes the circular platform one side of valve core and jet cover fixedly installed in the valve body close to the one end of high-pressure pipe abut.The valve structure of being set in the fluid outlet of high-pressure pipe in the present application, utilize the fluid pressure change in high-pressure pipe, realize the working condition switching of low pressure deslagging and high pressure cut layer, wherein, when low pressure deslagging, fluid flows from flow groove, overflow hole, hollow section of valve core;When high pressure cut layer, high-speed jet in jet cover pushes valve core to close overflow hole, so that fluid nozzle sprays, simple and reliable structure, switching is convenient.

Description

Technical Field

[0001] This invention belongs to the field of coal mine gas extraction technology and relates to a water pressure triggered ultra-high pressure horizontal cutting device for mining. Background Technology

[0002] As mining depths continue to increase, gas control faces new challenges. In environments with high gas content, high stress, and more complex geological conditions, efficient gas extraction is fundamental and essential for ensuring safe mining operations. Mining protective layers is the most effective means of preventing coal and rock dynamic disasters. For coal seams with suitable protective layer mining conditions, large-scale uniform pressure relief of the protected layer can be achieved through protective layer mining. However, for coal seams without protective layer mining conditions or those experiencing initial outbursts, how to achieve large-scale uniform pressure relief and permeability enhancement at the working face is a hot topic and a difficult problem both domestically and internationally. Ultra-high pressure hydraulic cutting and self-decompression technology utilizes high-pressure water jets to horizontally cut the coal seam, simultaneously achieving stress relief and gas extraction within the coal seam, representing an important technological path for future deep mines.

[0003] However, when performing horizontal cutting of this coal seam, the drill rod and hydraulic cutting tool need to be stable in a horizontal state and remain circumferentially stationary. This is not conducive to the drilling and discharge of coal slag. Therefore, the ultra-high pressure hydraulic cutting tool should have both high-pressure cutting and low-pressure slag discharge working modes to meet the different technical requirements of the cutting tool under different working conditions, and to avoid unstable coal slag from entering the tool's interior under different working modes, which would cause it to malfunction. Summary of the Invention

[0004] In view of this, the purpose of this invention is to provide a water pressure triggered ultra-high pressure horizontal cutting device for mining, which can switch between low pressure slag discharge and high pressure cutting to meet the different technical requirements of cutting tools under different working conditions.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a water pressure triggered ultra-high pressure horizontal cutting device for mining, comprising a shell and a high pressure pipe rotatably disposed within the shell, the high pressure pipe having two nozzles evenly distributed circumferentially, and the shell having multiple jet holes circumferentially opened at the corresponding nozzles; a hollow valve seat is connected to one end of the fluid outlet of the high pressure pipe, a valve body is installed inside the valve seat, and a valve core with a spring is provided inside the valve body;

[0006] The valve core includes a hollow section, a cylindrical section, and a frustum connected in sequence. A flow hole is opened circumferentially on the hollow section near the cylindrical section. The hollow section of the valve core slides with the bottom opening of the valve body, and the frustum also slides with the inner wall of the valve body. The diameter of the cylindrical section is larger than the diameter of the bottom opening.

[0007] The spring is sleeved on the hollow section and the cylindrical section. The inner wall of the valve body at the end away from the truncated cone has a stop step. One end of the spring abuts against the truncated cone of the valve core, and the other end abuts against the stop step. The natural rest length of the spring is greater than the distance between the truncated cone and the stop step. The preset elastic force of the spring makes one side of the truncated cone of the valve core abut against the jet cover fixedly installed in the valve body near the high pressure pipe end.

[0008] The jet cover has a through hole in the middle, the valve body has a flow groove on the outer wall, and the high pressure pipe is connected to the flow hole through the flow groove. The through hole abuts against the frustum.

[0009] Optionally, when the fluid pressure in the high-pressure pipe is not greater than the preset elastic force, a low-pressure slag discharge channel is formed along the flow groove, flow hole, and hollow section of the valve core, and the fluid in the high-pressure pipe flows out from the low-pressure slag discharge channel.

[0010] When the fluid pressure in the high-pressure pipe is greater than the preset elastic force, the fluid in the high-pressure pipe forms a high-speed jet through the through hole in the middle of the jet cover. The high-speed jet pushes the valve core to move away from the jet cover until the cylindrical section of the valve core abuts against the bottom inner wall of the valve body, sealing the flow hole on the hollow section, and the fluid in the high-pressure pipe is ejected from the nozzle.

[0011] Optionally, a shield is connected to the end of the hollow section of the valve core, and the shield extends to the nozzle; when the fluid pressure in the high-pressure pipe is not greater than the preset elastic force, the valve core is pressed against the side near the jet cover by the spring, and the shield closes the jet hole on the outer shell; when the fluid pressure in the high-pressure pipe is greater than the preset elastic force, the valve core drives the shield to move away from the jet cover, and the shield opens the jet hole on the outer shell.

[0012] Optionally, the through hole consists of an arcuate groove and a circular hole communicating with the arcuate groove, with the arcuate groove facing the high-pressure pipe side.

[0013] Optionally, the outer casing includes a housing, an adapter sleeve, and an adapter connected in sequence. The adapter sleeve is equipped with a bearing, the housing is equipped with a water tail fixing sleeve, and the water tail fixing sleeve is equipped with a water tail. The high-pressure pipe rotates relative to the outer casing through the bearing and the water tail.

[0014] Optionally, the end of the housing near the tailstock fixing sleeve is provided with an internal thread for connection with an external drill pipe.

[0015] Optionally, an axial limiting groove is provided on the outer wall of the hollow section of the valve core, and a protrusion is provided on the bottom opening of the corresponding valve body.

[0016] Optionally, a limit ring groove and a snap ring mounting groove are sequentially formed on the inner wall of the valve body near the frustum of the valve core. A jet cover is installed in the limit ring groove, and a snap ring is installed in the snap ring mounting groove. The jet cover is fixed to the limit ring groove by the snap ring.

[0017] Optionally, the bottom of the high-pressure pipe is provided with a counterweight to ensure that the nozzle is horizontal when the high-pressure pipe is in a static equilibrium state.

[0018] Optionally, the counterweight is equipped with a water pressure control valve that is connected to the high-pressure pipe, and the rotation of the high-pressure pipe is locked by the water pressure control valve.

[0019] The beneficial effects of this invention are as follows:

[0020] 1. This invention utilizes a water pressure-triggered valve structure installed at the fluid outlet of a high-pressure pipe to switch between low-pressure slag discharge and high-pressure layer cutting by taking advantage of fluid pressure changes within the high-pressure pipe. During low-pressure slag discharge, fluid flows out from the flow channel, the flow hole, and the hollow section of the valve core. During high-pressure layer cutting, the high-speed jet within the jet cover pushes the valve core to close the flow hole, allowing fluid to be ejected from nozzles arranged on the side. The structure is simple, reliable, and easy to switch between.

[0021] 2. The present invention also prevents unstable coal slag from entering the shell and affecting the normal operation of the device by cooperating with the shield and the jet holes on the outer shell, whether it is low-pressure slag discharge or high-pressure layer cutting.

[0022] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0023] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a partial cross-sectional view of the present invention;

[0026] Figure 3 for Figure 2 Enlarged view of a portion of point A in the middle.

[0027] Reference numerals: 1-outer shell, 11-housing shell, 12-adapter sleeve, 121-jet orifice, 13-adapter, 2-high pressure pipe, 21-nozzle, 22-hollow valve seat, 23-valve body, 231-bottom opening, 232-limiting ring groove, 233-jet cover, 234-through hole, 235-flow groove, 236-circuit spring mounting groove, 24-spring, 25-valve core, 251-hollow section, 252-cylindrical section, 253-flow orifice, 254-frustum, 26-shield. Detailed Implementation

[0028] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0029] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0030] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0031] Please see Figures 1-3 This is a water pressure triggered ultra-high pressure horizontal cutting device for mining, such as... Figure 1 As shown, it includes an outer shell 1 and a high-pressure pipe 2 rotatably disposed within the outer shell 1. Specifically, the outer shell 1 includes a housing 11, an adapter sleeve 12, and an adapter 13 connected in sequence by threads. The adapter sleeve 12 is provided with a bearing, and the housing 11 is provided with a water tail fixing sleeve. The water tail fixing sleeve is fixed by a limiting groove and a snap ring within the housing 11. The water tail fixing sleeve is provided with a water tail. The high-pressure pipe 2 rotates relative to the outer shell 1 through the bearing and the water tail. Nozzles 21 are symmetrically connected on both sides of the center line of the high-pressure pipe 2. The outer shell 1 corresponding to the nozzles 21 has multiple jet holes 121 circumferentially opened.

[0032] like Figure 2 As shown, a hollow valve seat 22 is threadedly connected to one end of the fluid outlet of the high-pressure pipe 2. A valve body 23 is threadedly installed inside the valve seat, and a valve core 25 with a spring 24 is provided inside the valve body 23. Figure 3As shown, the valve core 25 includes a hollow section 251, a cylindrical section 252, and a frustum 254 connected in sequence. A flow-through hole 253 is circumferentially formed on the hollow section 251 near the cylindrical section 252. The hollow section 251 of the valve core 25 is slidably engaged with the bottom opening 231 of the valve body 23, and the frustum 254 is also slidably engaged with the inner wall of the valve body 23. A spring 24 is sleeved on the hollow section 251 and the cylindrical section 252. The inner wall of the valve body 23 at the end away from the frustum has a stop step, and one end of the spring 24 abuts against the frustum of the valve core. The other end abuts against the stop step, and the natural rest length of the spring 24 is greater than the distance between the frustum and the stop step. The preset elastic force of the spring 24 causes one side of the frustum of the valve core 25 to abut against the jet cover 233 fixedly installed in the valve body 23 near the high pressure pipe 2. The diameter of the cylindrical section 252 is greater than the diameter of the bottom opening 231. This causes the bottom opening 231 to be closed when the cylindrical section 252 of the valve core 25 abuts against the bottom opening 231 of the valve body 23, and the bottom opening 231 also closes the flow hole 253.

[0033] The inner wall of the valve body 23 is provided with a limiting ring groove 232 and a snap ring mounting groove 236 on the side of the truncated cone 254 of the valve core 25. A jet cover 233 is installed in the limiting ring groove 232 and a snap ring is installed in the snap ring mounting groove 236. The jet cover 233 is fixed by the snap ring and the limiting ring groove 232. A through hole 234 is provided in the middle of the jet cover 233. A flow groove 235 is provided on the outer wall of the valve body 23. The high pressure pipe 2 and the flow hole are connected through the flow groove 235. The through hole abuts against the truncated cone. The through hole 234 is composed of an arc groove and a circular hole connected to the arc groove. The arc groove faces the side of the high pressure pipe 2.

[0034] When the fluid pressure in the high-pressure pipe 2 is not greater than the preset elastic force, a low-pressure slag discharge channel is formed along the flow groove 235, the flow hole 253, and the hollow section 251 of the valve core 25, and the fluid in the high-pressure pipe 2 flows out from the low-pressure slag discharge channel; when the fluid pressure in the high-pressure pipe 2 is greater than the preset elastic force, the fluid in the high-pressure pipe 2 forms a high-speed jet through the through hole 234 in the middle of the jet cover 233, and the high-speed jet pushes the valve core 25 to move away from the jet cover 233 until the cylindrical section of the valve core 25 abuts against the bottom inner wall of the valve body 23, sealing the flow hole 253 on the hollow section 251, so that the fluid in the high-pressure pipe 2 is ejected from the nozzle 21 for high-pressure cutting.

[0035] In this embodiment, a shield 26 is threadedly connected to the end of the hollow section 251 of the valve core 25, and the shield 26 extends to the nozzle 21. When the fluid pressure in the high-pressure pipe 2 is not greater than the preset elastic force, the valve core 25 is pressed against the side near the jet cover 233 by the spring 24, and the shield 26 closes the jet hole 121 on the outer shell 1; when the fluid pressure in the high-pressure pipe 2 is greater than the preset elastic force, the valve core 25 drives the shield 26 to move away from the jet cover 233, and the shield 26 opens the jet hole 121 on the outer shell 1. To prevent unstable coal slag from entering the interior of the outer shell 1 during high-pressure cutting, the length of the shield 26 can be extended, and circular holes corresponding to the nozzle 21 can be opened on the shield 26 symmetrically along the center line of the shield 26. When the shield 26 moves away from the jet cover 233 to the nozzle working position, only the circular holes of the jet holes 121 on the outer shell 1 are opened at the circular holes opened by the shield 26 to carry out high-pressure cutting, while the other jet holes 121 are blocked by the shield to reduce the entry of unstable coal slag into the interior of the outer shell 1.

[0036] The end of the housing 11 near the water tail fixing sleeve is provided with an internal thread for connection with an external drill pipe. An axial limiting groove is provided on the outer wall of the hollow section 251 of the valve core 25, and a protrusion is provided on the bottom opening 231 of the valve body 23 to prevent the cover 26 connected to the valve core 25 from rotating.

[0037] The bottom of the high-pressure pipe 2 is provided with a counterweight block that ensures the nozzle 21 is horizontal in a static equilibrium state. Two mounting grooves penetrating the bottom of the counterweight block and the high-pressure pipe are provided. The locking valve body has an external thread near the end of the high-pressure pipe 2, and the locking valve body is connected to the mounting groove at the bottom of the high-pressure pipe via the external thread. The locking valve body is hollow, including a communicating inner cavity and a through hole. A valve core that slides within the locking valve body is provided. Specifically, the second valve core includes a valve head and a valve stem fixedly connected. The second valve core includes... The valve includes a connected valve head and valve stem. The valve head is located near the end of the high-pressure pipe 2, and the outer diameter of the valve head is larger than the outer diameter of the valve stem and the inner diameter of the connection between the mounting groove and the inner cavity of the high-pressure pipe 2. A second spring is sleeved on the valve stem, and an inwardly protruding limiting step is provided in the inner cavity of the locking valve body to limit the two ends of the second spring in conjunction with the valve head. The natural rest length of the second spring is greater than the distance between the valve head and the limiting step, so that the end of the valve head away from the valve stem presses against the bottom of the high-pressure pipe 2 under the action of the second spring, thereby sealing the bottom of the high-pressure pipe 2.

[0038] The adapter sleeve 12 is connected to a limiting hole sleeve via a threaded connection. The limiting hole sleeve is located between the housing of the adapter sleeve 12 and the counterweight. The limiting hole sleeve has two sets of circumferentially distributed circular holes. The diameter of the circular holes is slightly larger than the diameter of the valve stem. When the valve stem is inserted into the circular hole, it cannot wobble. The number of sets of circular holes is the same as the number of mounting slots. In this embodiment, two sets of circular holes correspond to two mounting slots, and the center line of each set of circular holes is on the same plane as the axial center line of the valve core in the corresponding mounting slot. When the water pressure in the high-pressure pipe 2 is sufficient to overcome the preset elastic force of the second spring, the water pushes the valve head, causing the second valve core to move towards the housing until the valve stem is inserted into the corresponding circular hole. This allows the high-pressure pipe 2 to be locked in direction by extending one end of the valve stem of the second valve core into the corresponding circular hole of the limiting hole sleeve. Detailed implementation method:

[0040] When using the working condition switching device of the present invention, when the fluid pressure in the high-pressure pipe 2 is lower than 20MPa, the fluid in the high-pressure pipe 2 flows out through the low-pressure slag discharge channel formed by the flow groove 235, the flow hole 253, and the hollow section 251 of the valve core 25 in sequence, and performs low-pressure slag discharge; when the fluid pressure in the high-pressure pipe 2 is greater than 20MPa, the fluid in the high-pressure pipe 2 forms a high-speed jet through the through hole 234 in the middle of the jet cover 233. The high-speed jet pushes the valve core 25 to close the flow hole 253 on the hollow section 251, so that the fluid in the high-pressure pipe 2 is ejected from the nozzle 21 for high-pressure layer cutting.

[0041] During low-pressure slag discharge, the valve core 25 is pressed against the side near the jet cover 233 by the spring 24, and the shield 26 closes the jet hole 121 on the outer shell 1 to prevent coal slag from entering the interior of the outer shell 1 through the jet hole 121. During high-pressure layer cutting, the shield 26 moves away from the jet cover 233 to the nozzle working position. At this time, only the round hole of the jet hole 121 on the outer shell 1 opened by the shield 26 is open to carry out high-pressure layer cutting, while the other jet holes 121 are blocked by the shield to prevent unstable coal slag from entering the interior of the outer shell 1.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A water pressure-triggered ultra-high pressure horizontal cutting device for mining, comprising a shell (1) and a high-pressure pipe (2) rotatably disposed within the shell (1), wherein the high-pressure pipe (2) has two nozzles (21) evenly distributed circumferentially, and the shell (1) corresponding to the nozzles (21) is provided with a plurality of jet holes (121) circumferentially; characterized in that: One end of the fluid outlet of the high-pressure pipe (2) is connected to a hollow valve seat (22), and a valve body (23) is installed inside the hollow valve seat (22). A valve core (25) with a spring (24) is provided inside the valve body (23). The valve core (25) includes a hollow section (251), a cylindrical section (252) and a frustum (254) connected in sequence. A flow hole (253) is provided circumferentially on the hollow section (251) near the cylindrical section (252). The hollow section (251) of the valve core (25) is slidably engaged with the bottom opening (231) of the valve body (23), and the frustum (254) is also slidably engaged with the inner wall of the valve body (23). The diameter of the cylindrical section (252) is larger than the diameter of the bottom opening (231). The spring (24) is sleeved on the hollow section (251) and the cylindrical section (252). The inner wall of the valve body (23) away from the frustum (254) has a stop step. One end of the spring abuts against the frustum (254) of the valve core (25), and the other end abuts against the stop step. The natural rest length of the spring (24) is greater than the distance between the frustum (254) and the stop step. The preset elastic force of the spring (24) makes one side of the frustum (254) of the valve core (25) abut against the jet cover (233) fixedly installed in the valve body (23) near the end of the high pressure pipe (2). The jet cover (233) has a through hole (234) in the middle, the valve body (23) has a flow groove (235) on its outer wall, and the high pressure pipe (2) is connected to the flow hole (253) through the flow groove (235). The through hole (234) abuts against the frustum (254). When the fluid pressure in the high-pressure pipe (2) is not greater than the preset elastic force of the spring (24), a low-pressure slag discharge channel is formed along the flow groove (235), the flow hole (253), and the hollow section (251) of the valve core (25), and the fluid in the high-pressure pipe (2) flows out from the low-pressure slag discharge channel; when the fluid pressure in the high-pressure pipe (2) is greater than the preset elastic force of the spring (24), the fluid in the high-pressure pipe (2) forms a high-speed jet through the through hole (234) in the middle of the jet cover (233), and the high-speed jet pushes the valve core (25) to move away from the jet cover (233) until the cylindrical section (252) of the valve core (25) abuts against the bottom inner wall of the valve body (23), sealing the flow hole (253) on the hollow section (251), and the fluid in the high-pressure pipe (2) is ejected from the nozzle (21); The end of the hollow section (251) of the valve core (25) is connected to a shield (26), which extends to the nozzle (21). When the fluid pressure in the high-pressure pipe (2) is not greater than the preset elastic force, the valve core (25) is pressed against the side near the jet cover (233) by the spring (24), and the shield (26) closes the jet hole (121) on the outer shell (1). When the fluid pressure in the high-pressure pipe (2) is greater than the preset elastic force, the valve core (25) drives the shield (26) to move away from the jet cover (233), and the shield (26) opens the jet hole (121) on the outer shell (1).

2. The water pressure triggered ultra-high pressure horizontal cutting device for mining according to claim 1, characterized in that: The through hole (234) consists of an arc groove and a circular hole communicating with the arc groove, with the arc groove facing the high-pressure pipe (2).

3. The water pressure triggered ultra-high pressure horizontal cutting device for mining according to claim 1, characterized in that: The outer casing (1) includes a housing (11), an adapter sleeve (12), and an adapter (13) connected in sequence. The adapter sleeve (12) is provided with a bearing. The housing (11) is provided with a water tail fixing sleeve. The water tail fixing sleeve is provided with a water tail. The high-pressure pipe (2) rotates relative to the outer casing (1) through the bearing and the water tail.

4. The water pressure triggered ultra-high pressure horizontal cutting device for mining according to claim 3, characterized in that: The housing (11) has an internal thread for connecting to an external drill rod at one end near the tailstock fixing sleeve.

5. The water pressure triggered ultra-high pressure horizontal cutting device for mining according to claim 1, characterized in that: An axial limiting groove is provided on the outer wall of the hollow section (251) of the valve core (25), and a protrusion is provided on the bottom opening of the corresponding valve body (23).

6. The water pressure triggered ultra-high pressure horizontal cutting device for mining according to claim 1, characterized in that: The inner wall of the valve body (23) is provided with a limiting ring groove (232) and a snap ring mounting groove (236) on the side of the valve core (25) near the frustum (254). A jet cover (233) is installed in the limiting ring groove (232), and a snap ring is installed in the snap ring mounting groove (236). The jet cover (233) is fixed by the snap ring and the limiting ring groove (232).

7. The water pressure triggered ultra-high pressure horizontal cutting device for mining according to claim 1, characterized in that: The bottom of the high-pressure pipe (2) is provided with a counterweight (27) that makes the nozzle (21) horizontal in the static equilibrium state of the high-pressure pipe (2).

8. The water pressure triggered ultra-high pressure horizontal cutting device for mining according to claim 7, characterized in that: The counterweight is equipped with a water pressure control valve that is connected to the high-pressure pipe (2), and the rotation of the high-pressure pipe (2) is locked through the water pressure control valve.

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