Mine ultra-high pressure directional lock horizontal slicing device

Abstract

The present application relates to a kind of mining ultra-high pressure directional lock dead horizontal cutting device, belong to coal mine gas extraction technical field, including shell and high pressure pipe rotation setting in shell, the fluid outlet one end of high pressure pipe is closed, two nozzles are uniformly distributed along the circumference of high pressure pipe, the counterweight that makes nozzle be in horizontal direction in the static equilibrium state of high pressure pipe is equipped in high pressure pipe bottom;Counterweight and high pressure pipe bottom are provided with at least one installation slot that passes through counterweight and high pressure pipe bottom, lock valve body is equipped in installation slot, lock valve body is hollow, lock valve body is equipped with valve core, valve core includes the valve head and valve rod connected;Limiting hole sleeve is also equipped in shell, limiting hole sleeve is located between shell and counterweight, at least one group of circular holes is opened in limiting hole sleeve, and high pressure pipe is inserted into the circular hole of corresponding limiting hole sleeve by the valve rod one end of valve core to realize direction lock.This application realizes when horizontal cutting device is advanced to design perforation position and executes high pressure perforation operation, so that horizontal cutting device is directionally locked in design injection position.

Description

Technical Field

[0001] This invention belongs to the field of coal mine gas extraction technology and relates to a mine-use ultra-high pressure directional locking horizontal cutting device. 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 research topic and a difficult problem both domestically and internationally. Using ultra-high pressure water jet technology to simulate protective layer mining in coal seams without suitable conditions for horizontal cutting can effectively improve coal seam gas control levels and has significant socio-economic benefits.

[0003] In existing technologies, when horizontal cutting devices (also known as slotters) are used for directional high-pressure water jet injection, issues with equipment machining accuracy and tool posture control can cause the slotter to rotate at high speed within the hole. This prevents the jet from being focused horizontally for directional cutting, thus affecting the efficiency of coal seam gas permeability enhancement. Therefore, there is a need for a mine-use ultra-high-pressure directional locking horizontal cutting device that locks the horizontal cutting device at the designed injection position when it advances to the designed perforation position and performs high-pressure perforation operations. Summary of the Invention

[0004] In view of this, the purpose of this invention is to solve the practical problem that the high-speed rotation of the slit cutter inside the hole causes the jet to be unable to be focused in the horizontal direction for spray cutting. A mining ultra-high pressure directional locking horizontal cutting device is proposed, which locks the horizontal cutting device in the designed spray position when the horizontal cutting device is advanced to the designed perforation position and performs high pressure perforation operation.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a mining ultra-high pressure directional locking horizontal cutting device, comprising a housing and a high-pressure pipe rotatably disposed within the housing, one end of the fluid outlet of the high-pressure pipe being closed, two nozzles being evenly distributed along the circumference of the high-pressure pipe, and a counterweight block being provided at the bottom of the high-pressure pipe such that the nozzles are horizontal in the static equilibrium state of the high-pressure pipe; at least one mounting groove penetrating the bottom of the counterweight block and the high-pressure pipe is provided at the bottom of the high-pressure pipe, and a locking valve body is provided in the mounting groove, the locking valve body being hollow, and a valve core being provided inside the locking valve body, the valve core including a connected valve head and valve stem, the valve core being slidably engaged with the locking valve body;

[0006] The valve core includes a connected valve head and valve stem. The valve head is located at one end near the high-pressure pipe, 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.

[0007] A spring is fitted 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 spring in conjunction with the valve head. The natural rest length of the 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 is pressed against the bottom of the high-pressure pipe under the action of the spring.

[0008] The housing is also provided with a limiting hole sleeve, which is located between the housing and the counterweight. The limiting hole sleeve has at least one set of circular holes evenly distributed along the circumference. The number of sets of circular holes is the same as the number of 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. The high pressure pipe extends into the circular hole of the corresponding limiting hole sleeve through one end of the valve stem of the valve core to achieve directional locking.

[0009] Optionally, the limiting hole sleeve has at least two sets of circular holes evenly distributed along the circumference, and the adjacent sets of circular holes are staggered.

[0010] Optionally, the limiting hole sleeve is detachably fixed to the housing.

[0011] Optionally, the section of the mounting groove near the inner cavity of the high-pressure pipe is a frustoconical hole, so that the outer diameter of the valve head is larger than the inner diameter of the connection between the mounting groove and the inner cavity of the high-pressure pipe; the inner cavity of the locking valve body has two cavities with different inner diameters, and the inner diameter of the cavity near the valve head is larger than the inner diameter of the cavity away from the valve head, so as to form an inwardly protruding limiting step in the inner cavity of the locking valve body.

[0012] Optionally, the locking valve body has an external thread at the end near the high-pressure pipe, and the locking valve body is connected to the mounting groove at the bottom of the high-pressure pipe through the external thread.

[0013] Optionally, the counterweight is a corresponding arc block with a central angle of 120° and a weight of not less than 3kg.

[0014] Optionally, a sealing ring is provided on the valve core.

[0015] Optionally, the counterweight can be detachably fixed to the high-pressure pipe.

[0016] Optionally, the end of the housing away from the nozzle has an internal thread.

[0017] Optionally, the spring is a high-strength spring.

[0018] The beneficial effects of this invention are as follows:

[0019] 1. This invention sets a configuration block at the bottom of the high-pressure pipe and opens an installation groove. A valve body and a valve core with a spring are set in the installation groove. The spring is pre-compressed so that the valve head of the valve core presses against the bottom of the high-pressure pipe. When the fluid pressure flowing in the high-pressure pipe is greater than the preset elastic force of the spring, it pushes the valve stem of the valve core to move towards the housing and extends into the round hole in the corresponding limiting hole sleeve to lock the direction of the high-pressure pipe, so that the high-pressure pipe cannot rotate. Thus, when the horizontal cutting device is advanced to the designed perforation position and performs high-pressure perforation operation, the direction of the horizontal cutting device is locked at the designed spray position.

[0020] 2. The present invention also provides multiple sets of circular holes staggered on the limiting sleeve. The staggered circular holes enable the high-pressure pipe to be locked in all directions, which facilitates the high-pressure perforation operation. When the pressure of the fluid flowing in the high-pressure pipe is adjusted from small to large until the working pressure, the nozzle can be kept in a horizontal state.

[0021] 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

[0022] 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:

[0023] Figure 1 This is a partial structural diagram of the present invention;

[0024] Figure 2 This is a partial cross-sectional view of the present invention;

[0025] Figure 3 for Figure 2 A magnified view of part A in the image.

[0026] Reference numerals: 1-Housing, 2-High pressure pipe, 3-Nozzle, 4-Counterweight, 5-Mounting groove, 6-Lock valve body, 7-Spring, 8-Valve core, 801-Sealing ring, 9-Limiting hole sleeve, 901-Round hole. Detailed Implementation

[0027] 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.

[0028] 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.

[0029] 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.

[0030] Please see Figures 1-3 This is a mining ultra-high pressure directional locking horizontal cutting device, improved from existing horizontal cutting devices (also known as slotters). Its main function is directional locking, such as... Figure 1 As shown, the system includes a housing 1 and a high-pressure pipe 2 rotatably disposed within the housing 1 (only the parts relevant to the present invention are shown in the figure). In this embodiment, the high-pressure pipe 2 and the housing 1 are rotated relative to each other by bearings, a water tail fixing seat, and a water tail within the housing 1. Two nozzles 3 are evenly distributed around the circumference of the high-pressure pipe 2. One end of the fluid outlet of the high-pressure pipe 2 (which is high-pressure water in this embodiment) is closed. The high-pressure water in the high-pressure pipe 2 is ejected at high speed from the nozzles 3 to form a high-pressure jet to cut the borehole. At the bottom of the high-pressure pipe 2, i.e., on the vertical line between the two nozzles 3, a counterweight 4 is connected by threads to ensure that the nozzles 3 are in a horizontal position when the high-pressure pipe 2 is in a static equilibrium state.

[0031] like Figure 2As shown, two mounting grooves 5 are provided at the bottom of the counterweight 4 and the high-pressure pipe 2, penetrating the bottom of the counterweight 4 and the high-pressure pipe 2. The locking valve body 6 has an external thread at one end near the high-pressure pipe 2. The locking valve body 6 is connected to the mounting grooves 5 at the bottom of the high-pressure pipe 2 via the external thread. The locking valve body 6 is hollow, including a communicating inner cavity and a through hole. A valve core 8 is provided inside the locking valve body 6, which slides within the locking valve body 6. Specifically, the valve core 8 includes a valve head and a valve stem fixedly connected. The valve head is located at one end near 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 5 and the inner cavity of the high-pressure pipe 2. A spring 7 is sleeved on the valve stem, and an inwardly protruding limiting step is provided in the inner cavity of the locking valve body 6 to cooperate with the valve head to limit the two ends of the spring 7. The natural rest length of the spring 7 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 spring 7, thereby sealing the bottom of the high-pressure pipe 2.

[0032] A limiting hole sleeve 9 is connected to the housing 1 via a threaded connection. The limiting hole sleeve 9 is located between the housing 1 and the counterweight 4. The limiting hole sleeve 9 has two sets of circumferentially distributed circular holes 901. The diameter of the circular holes 901 is slightly larger than the diameter of the valve stem. When the valve stem is inserted into the circular hole 901, it cannot wobble. The number of sets of circular holes 901 is the same as the number of mounting slots 5. In this embodiment, two sets of circular holes correspond to two mounting slots, and the center line of each set of circular holes 901 is on the same plane as the axial center line of the valve core 8 in the corresponding mounting slot 5. When the water pressure in the high-pressure pipe 2 is sufficient to overcome the preset elastic force of the spring, the water pushes the valve head, causing the valve core 8 to move towards the housing 1 until the valve stem is inserted into the corresponding circular hole 901. This allows the high-pressure pipe 2 to be locked in direction by extending one end of the valve stem of the valve core 8 into the corresponding circular hole 901 of the limiting hole sleeve 9.

[0033] In this embodiment, when the water pressure is greater than 15MPa, the water pressure can overcome the preset elastic force of the spring 7 to push the valve core 8, so that the lower end of the valve core 8 is inserted into the round hole, that is, the valve core 8 locks the high pressure pipe 2 through the round hole 901.

[0034] In this embodiment, the limiting hole sleeve 9 has two sets of circular holes 901 evenly distributed along the circumference, and the two adjacent sets of circular holes 901 are staggered. The limiting hole sleeve 9 is a ring with a length of 150mm, an outer diameter of 38mm, an inner diameter of 37mm, and a wall thickness of 1mm. Its opening parameters are: hole diameter 2.5mm, hole spacing 5.0mm, row spacing 100mm, and inner stagger distance 2.5mm.

[0035] In this embodiment, as Figure 3As shown, the section of the mounting groove 5 near the inner cavity of the high-pressure pipe 2 is a frustoconical hole, so that the outer diameter of the valve head is larger than the inner diameter of the connection between the mounting groove 5 and the inner cavity of the high-pressure pipe 2; the inner cavity of the locking valve body 6 has two cavities with different inner diameters, and the inner diameter of the cavity near the valve head is larger than the inner diameter of the cavity away from the valve head, so as to form an inwardly protruding limiting step in the inner cavity of the locking valve body 6. The valve core 8 is a variable cross-section cylinder with a length of 25mm. The upper valve head has a diameter of 4.5mm and a length of 5mm, while the lower valve stem has a diameter of 2mm and a length of 20mm. To ensure the sealing effect of the valve head on the bottom of the high-pressure pipe 2, a sealing ring 801 is also provided on the valve head. Specifically, a sealing groove with a depth of 1.0mm and a width of 1.0mm is excavated in the middle of the valve head, and a 4.5×1.0mm sealing ring 801 is installed to match it. The counterweight 4 is an arc block with a central angle of 120° corresponding to the high-pressure pipe 2, and its weight is not less than 3kg. The end of the housing 1 away from the nozzle 3 is provided with an internal thread, which connects to the slit drill rod in the hole through the internal thread. The other end is provided with a connector (not shown in the figure) for connecting with other external tools. Detailed implementation method:

[0037] When using the device of the present invention, when the water pressure is below 15MPa, the locking device is not opened, the valve core 8 remains pressed against the high-pressure pipe 2, and the water in the high-pressure pipe 2 cannot flow out from the locking valve body 6. At this time, the horizontal cutting device can achieve adaptive orientation through the counterweight 4 at the bottom of the high-pressure pipe 2. That is, since the counterweight 4 is located on the vertical line of the two nozzles 3, when the high-pressure pipe 2 is balanced and stationary, the side where the counterweight 4 is located faces directly downward, so that the two nozzles 3 are in a horizontal state. When the water pressure is above 15MPa, the directional locking device is opened, that is, the valve core 8 is pushed by the water pressure, and the valve stem of the valve core 8 extends into the round hole 901 on the limiting hole sleeve 9, thereby locking the direction of the high-pressure pipe 2. This ensures that when performing high-pressure directional cutting operations, the high-speed jet will not fail to be positioned at the designed opening position due to the reaction force of the nozzle jet or the unbalanced force of the opposing double nozzles.

[0038] It should be noted that when using the device of the present invention, if the overflow pressure of the water in the high-pressure pipe 2 is adjusted from small to large until the working pressure is reached, the nozzle 3 will be automatically leveled by the counterweight 4 before the water pressure reaches 15MPa, so that the nozzle 3 remains in a horizontal state. When the water pressure exceeds 15MPa, the valve core 8 is pushed into the round hole 901 on the limiting hole sleeve 9 to lock the direction of the high-pressure pipe, so that the nozzle 3 can always remain in a horizontal state.

[0039] 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 mining ultra-high pressure directional locking horizontal cutting device, comprising a shell (1) and a high-pressure pipe (2) rotatably disposed within the shell (1), wherein one end of the fluid outlet of the high-pressure pipe (2) is closed, and two nozzles (3) are evenly distributed along the circumference of the high-pressure pipe (2), and a counterweight (4) is provided at the bottom of the high-pressure pipe (2) such that the nozzles (3) are horizontal in the high-pressure pipe (2) in a static equilibrium state; characterized in that: At least one mounting groove (5) is provided at the bottom of the counterweight (4) and the high-pressure pipe (2) through the bottom of the counterweight (4) and the high-pressure pipe (2). A locking valve body (6) is provided in the mounting groove (5). The locking valve body (6) is hollow and a valve core (8) is provided inside the locking valve body (6). The valve core (8) and the locking valve body (6) are in sliding cooperation. The valve core (8) includes a connected valve head and valve stem. The valve head is arranged at one end close to the high-pressure pipe (2), and the outer diameter of the valve head is greater than the outer diameter of the valve stem and the inner diameter of the communication port between the mounting groove (5) and the inner cavity of the high-pressure pipe (2). A spring (7) is fitted on the valve stem, and an inwardly protruding limiting step is provided in the inner cavity of the locking valve body (6) to cooperate with the valve head to limit the two ends of the spring (7). The natural rest length of the spring (7) 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 abuts against the bottom of the high pressure pipe (2) under the action of the spring (7). The housing (1) is also provided with a limiting hole sleeve (9), which is located between the housing (1) and the counterweight (4). The limiting hole sleeve (9) has at least one set of circular holes (901) evenly distributed along the circumference. The number of sets of circular holes (901) is the same as the number of mounting grooves (5), and the center line of each set of circular holes (901) is in the same plane as the axial center line of the valve core (8) in the corresponding mounting groove (5). The high pressure pipe (2) is locked in direction by extending one end of the valve stem of the valve core (8) into the circular hole (901) of the corresponding limiting hole sleeve (9).

2. The mining ultra-high pressure directional locking horizontal layer cutting device according to claim 1, characterized in that: The limiting hole sleeve (9) has at least two sets of circular holes (901) evenly distributed along the circumference, and the two sets of circular holes (901) are staggered.

3. The mining ultra-high pressure directional locking horizontal layer cutting device according to claim 1, characterized in that: The limiting hole sleeve (9) is detachably fixed to the housing (1).

4. The mining ultra-high pressure directional locking horizontal layer cutting device according to claim 1, characterized in that: The section of the mounting groove (5) near the inner cavity of the high-pressure pipe (2) is a frustoconical hole, so that the outer diameter of the valve head is larger than the inner diameter of the connection between the mounting groove (5) and the inner cavity of the high-pressure pipe (2); the inner cavity of the locking valve body (6) has two cavities with different inner diameters, and the inner diameter of the cavity near the valve head is larger than the inner diameter of the cavity away from the valve head, so as to form an inwardly protruding limiting step in the inner cavity of the locking valve body (6).

5. The mining ultra-high pressure directional locking horizontal layer cutting device according to claim 4, characterized in that: The locking valve body (6) has an external thread at one end near the high pressure pipe (2), and the locking valve body (6) is connected to the mounting groove (5) at the bottom of the high pressure pipe (2) through the external thread.

6. The mining ultra-high pressure directional locking horizontal layer cutting device according to claim 1, characterized in that: The counterweight (4) is a circular arc block with a central angle of 120° and a weight of not less than 3kg.

7. The mining ultra-high pressure directional locking horizontal layer cutting device according to claim 1, characterized in that: The valve head of the valve core (8) is provided with a sealing ring (801).

8. The mining ultra-high pressure directional locking horizontal layer cutting device according to claim 1, characterized in that: The counterweight (4) is detachably fixed to the high-pressure pipe (2).

9. The mining ultra-high pressure directional locking horizontal layer cutting device according to claim 1, characterized in that: The end of the housing (1) away from the nozzle (3) is provided with an internal thread.

10. The mining ultra-high pressure directional locking horizontal layer cutting device according to claim 1, characterized in that: The spring (7) is a high-strength spring.

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