Mining electric control type high-pressure water jet equivalent section adjusting device

Abstract

The invention relates to a mining electric control type high-pressure water jet equivalent section adjusting device, and belongs to the field of coal mine gas extraction. The device comprises a device shell, a limiting stopper, a compensation channel, a sealing barrel cover, a punching nozzle and a slotting nozzle. The device shell is provided with two sets of nozzles, one set is slotting nozzles, and the other set is punching nozzles. The main electromagnetic mechanism and the auxiliary electromagnetic mechanism control opening and closing of the nozzle, and high-pressure water jet equivalent section adjustment is achieved. The sealing barrel cover is connected with the main servo valve body through a connecting supporting rod, the sealing barrel cover is controlled to reciprocate on the inner wall of the device shell in the axial direction, and therefore the nozzle is controlled to be opened and closed. The compensation channel is communicated with the annular channel between the device shell and the center pipe and the bottom side, close to the hole, of the main servo valve body, and the flow direction of high-pressure fluid is controlled. According to the method, the operation efficiency and accuracy are improved, the coal seam gas hydraulic permeability increasing effect is optimized, and the method is suitable for safe and efficient mining under the complex coal seam condition.

Description

Technical Field

[0001] The invention belongs to the field of coal mine gas extraction and relates to an electrically controlled high-pressure water jet equivalent cross-section regulating device for mining. Background Art

[0002] With the continuous growth of my country's energy demand, the safe and efficient mining of high-gas-content and low-permeability coal seams has become an important challenge facing the coal mining industry. High-pressure water jet pressure relief and permeability enhancement technology is a key means to solve this problem. It cuts or peels coal seams through the impact force of high-energy fluids, effectively reduces coal seam ground stress, and improves gas permeability. It is a gas extraction technology commonly used in coal mines.

[0003] High-pressure water jet technology is mainly divided into two branches: ultra-high-pressure hydraulic slotting technology and medium-low-pressure large-displacement hydraulic punching technology. Ultra-high-pressure hydraulic slotting technology uses high-pressure water jets to impact coal seams to form flat slots, which are closed under the action of ground stress, reducing the ground stress of the coal seam and improving the extraction performance. It is suitable for harder coal seams; medium-low-pressure large-displacement hydraulic punching technology uses water jets to strip the coal body, increase the borehole diameter and surface area, and is suitable for efficient extraction of soft coal seams.

[0004] However, the in-hole equipment used for high-pressure water jet measures in the prior art mostly adopts a mechanical structure, which cannot flexibly switch between different working modes in the same borehole, resulting in low operating efficiency and insufficient precision in the implementation of measures. Especially when faced with complex coal seam geological conditions, it is difficult for the prior art to give full play to the advantages of various hydraulic measures and to achieve efficient hydraulic coal seam permeability enhancement operations. Therefore, there is an urgent need for a device that can switch between multiple working modes in the same borehole to improve operating efficiency and accuracy and ensure the effect of gas extraction under complex coal seam conditions. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide an electrically controlled high-pressure water jet equivalent cross-section adjustment device for mining, so as to realize seamless switching between ultra-high pressure hydraulic cutting and large-displacement hydraulic punching working modes, so as to improve working efficiency and accuracy.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] An electrically controlled high-pressure water jet equivalent cross-section regulating device for mining, comprising:

[0008] Device housing;

[0009] a compensation channel, located within the housing of the device;

[0010] A sealed barrel cover, located inside the device housing;

[0011] A punching nozzle and a slitting nozzle, located on the housing of the device;

[0012] The main electromagnetic mechanism, the main servo valve body, and the main servo spring are located between the sealing barrel cover and the device housing;

[0013] The auxiliary electromagnetic mechanism, the auxiliary servo valve body, and the auxiliary servo spring are located in the compensation channel;

[0014] Connect the support rod, connect the sealing barrel cover and the main servo valve body;

[0015] A center pipe passing through the device housing and the sealing drum cover;

[0016] The connecting support rod channel is located in the central tube; wherein the main electromagnetic mechanism directly controls the main servo valve body to move forward and backward toward the bottom side and the orifice side of the hole, thereby driving the connecting support rod and the sealing barrel cover to move forward and backward toward the bottom side and the orifice side of the hole, thereby realizing the opening and closing of the punching nozzle, and further realizing the equivalent cross-section adjustment of the high-pressure water jet device; the auxiliary electromagnetic mechanism controls the auxiliary servo valve body to move forward and backward toward the bottom side and the orifice side of the hole, thereby realizing the opening and closing of the intersection of the compensation channel through the auxiliary servo valve body.

[0017] Optionally, the device housing is provided with two nozzles, the first one close to the orifice side is a punching nozzle, including two small diameter nozzles, which are arranged symmetrically at 180°; the second one is a slitting nozzle, including four large diameter nozzles, which are arranged in sequence at a 90° interval.

[0018] Optionally, a limiter is provided between the device casing and the central tube to fix the device casing and the central tube.

[0019] Optionally, the limiters are spaced 120° apart from each other, and three groups are provided in total, each group consisting of three limiters, which are rigidly connected to the central tube and the device housing through fixing bolts and fixing steps.

[0020] Optionally, the punching nozzle and the slitting nozzle penetrate the device housing and are rigidly connected to the device housing via threads, and a limiting step is fixedly arranged inside the device housing, below the punching nozzle and close to the orifice side.

[0021] Optionally, the compensation channel is four mutually perpendicular pipes that penetrate from the surface to the geometric center of the center tube, are externally connected to the annular channel between the device casing and the center tube, and are internally connected to the main servo valve body near the bottom of the hole.

[0022] Optionally, when the compensation channel is opened, the high-pressure fluid in the device casing and the annular channel between the center pipe enters the main servo valve body near the bottom of the hole, and the high-pressure fluid pressure is consistent with the main servo spring force and the braking force direction of the main electromagnetic mechanism, overcoming the device casing and the flow impulse in the annular channel between the center pipe, so that the sealing barrel cover is braked at the limit step. At this time, the punching nozzle is in a closed state, and the equivalent flow cross-section of the high-pressure water jet is reduced; when the compensation channel is closed, the high-pressure fluid in the device casing and the annular channel between the center pipe cannot apply static pressure to the main servo valve body near the bottom of the hole, and the main electromagnetic mechanism applies a force toward the bottom of the hole, which together with the device casing and the flow impulse in the annular channel between the center pipe overcomes the main servo spring force, ensuring that the sealing barrel cover moves toward the bottom of the hole at the limit step. At this time, the punching nozzle is in an open state, and the equivalent flow cross-section of the high-pressure water jet is increased.

[0023] Optionally, the main servo spring is fixed to the step inside the center tube near the bottom of the hole and is fixed to the main servo valve body near the hole mouth. The main servo spring maintains normal compression. When the punching nozzle is in a closed state, the main servo spring and the main electromagnetic mechanism jointly apply a braking force to brake the sealing barrel cover at the limit step, thereby closing the punching nozzle; when the punching nozzle is in an open state, the braking force of the main electromagnetic mechanism and the impact force in the direction of the high-pressure water flow offset the action of the main servo spring, so that the main electromagnetic mechanism controls the main servo valve body to move toward the bottom of the hole, thereby opening the punching nozzle.

[0024] Optionally, the auxiliary servo spring is fixed to the step inside the center tube on the bottom side of the hole and is fixed to the auxiliary servo valve body on the orifice side. The auxiliary servo spring maintains normal tension, so that the auxiliary servo valve body shrinks into the auxiliary electromagnetic mechanism, keeping the compensation channel in an open state; when the auxiliary electromagnetic mechanism applies a braking force to the orifice side to overcome the pulling force of the auxiliary servo spring toward the bottom side of the hole, the auxiliary servo valve body enters the intersection of the compensation channel, isolating the hydraulic connection between the main servo valve body and the device casing and the annular channel between the center tube.

[0025] The beneficial effects of the present invention are:

[0026] The electric-controlled high-pressure water jet equivalent section adjustment device for mining of the present invention cooperates with the electromagnetic mechanism, high-rigidity spring, and hydraulic assistance of the compensation channel to control the reciprocating motion of the sealing barrel cover in the annular channel where the high-pressure fluid exists, and realizes the active opening and closing of the punching nozzle, thereby actively changing the flow section of the high-pressure water jet equivalent section adjustment device. The present invention controls the opening and closing of the small section, and realizes the opening and closing of the valve body under the condition of ultra-high-pressure flow fluid in the pipeline with a small braking force, thereby realizing the flexible switching of the two working modes of ultra-high-pressure hydraulic slitting and large-displacement hydraulic punching in the same borehole, avoiding the low operating efficiency and insufficient precision of the implementation of measures caused by sending different equipment into and out of the borehole multiple times. In the face of complex coal seam geological conditions, the respective advantages of various hydraulic measures are fully utilized to ensure the smooth progress of hydraulic pressure relief and permeability enhancement operations in deep low-permeability coal seams, which is conducive to the promotion and application of high-pressure hydraulic technology.

[0027] Specifically, the beneficial effects of the present invention include but are not limited to the following aspects:

[0028] 1. Improve work efficiency: By realizing seamless switching between ultra-high pressure hydraulic cutting and large-displacement hydraulic punching, it avoids the need for different equipment to be sent in and out of the borehole multiple times, significantly improving work efficiency.

[0029] 2. Improve the accuracy of measure execution: The present invention can flexibly select the working mode according to different coal seam geological conditions, thereby improving the accuracy of measure execution.

[0030] 3. Optimizing the hydraulic permeability enhancement effect of coal seam gas: By optimizing the adjustment of the equivalent cross-section of high-pressure water jets, the present invention can more effectively reduce the ground stress of coal seams, improve gas permeability, and thus optimize the hydraulic permeability enhancement effect of coal seam gas.

[0031] 4. Ensure safe and efficient mining under complex coal seam conditions: Applicable to complex coal seam conditions, ensuring the safety and efficiency of hydraulic pressure relief and permeability enhancement operations in deep low-permeability coal seams.

[0032] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0034] Figure 1 It is a cross-sectional schematic diagram of an electric-controlled high-pressure water jet equivalent cross-section adjustment device for mining;

[0035] Figure 2 It is a schematic diagram of the limiter of the equivalent cross-section adjustment device of the electric-controlled high-pressure water jet used in mining;

[0036] Figure 3 This is a schematic diagram of the sealing barrel cover of the electric-controlled high-pressure water jet equivalent cross-section adjustment device for mining;

[0037] Figure 4 This is a schematic diagram of the compensation channel of the electric-controlled high-pressure water jet equivalent cross-section adjustment device for mining.

[0038] Figure numerals: device housing 1, limiter 2, compensation channel 3, sealing barrel cover 4, punching nozzle 5, slitting nozzle 6, auxiliary electromagnetic mechanism 7, auxiliary servo spring 8, auxiliary servo valve body 9, main servo spring 10, connecting support rod 11, main servo valve body 12, main electromagnetic mechanism 13, limit step 14, center tube 15, fixing bolt 16, fixing step 17, connecting support rod channel 18. DETAILED DESCRIPTION

[0039] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways 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 only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0040] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0041] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0042] See also Figure 1 to Figure 4 It is an electrically controlled high-pressure water jet equivalent cross-section adjustment device for mining.

[0043] The device housing 1 has an outer diameter of 89mm, an inner diameter of 63mm, and a wall thickness of 13mm, and is made of 304 stainless steel. Two groups of nozzles are arranged on the device housing 1 near the orifice. The first group is a slit nozzle 6, with two nozzles having a nozzle diameter of 2.0mm, and the nozzles are 180° apart and arranged symmetrically in the center; the second group is a punching nozzle 5, with four nozzles having a diameter of 4.5mm, and the nozzles are 90° apart and arranged symmetrically in the center; the slit nozzle 6 and the punching nozzle 5 are spaced 100mm apart. A circle of limiting steps 14 is arranged on the inner wall of the punching nozzle 5 of the device housing 1 at a position 10mm beyond the mounting hole of the punching nozzle 5. The limiting step 14 is a circular ring welded on the inner wall of the device housing 1, and the limiting step 14 has a height of 1.0mm and a width of 1.0mm.

[0044] The stoppers 2 are two groups of supporting edges between the device housing 1 and the center tube 15. Three stoppers 2 are set in each group, and they are 120° apart from each other. The stoppers 2 are rigidly connected to the device housing 1 by fixing bolts 16, and rigidly connected to the center tube 15 by fixing steps 17. The fixing steps 17 are a circular ring welded on the outer wall of the center tube 15, with a height of 1.0mm, a width of 1.0mm, an inner diameter of 43mm, and an outer diameter of 45mm. The first group of stoppers 2 is set on the side of the slit nozzle 6 near the orifice, 630mm away from the slit nozzle; the second group of stoppers 2 is set at the position of the auxiliary electromagnetic mechanism 7 near the bottom of the hole.

[0045] The central tube 15 has an outer diameter of 43 mm, and is provided with auxiliary electromagnetic mechanism 7, auxiliary servo spring 8, auxiliary servo valve body 9, compensation channel 3, main servo spring 10, connecting rod 11, sealing barrel cover 4, main servo valve body 12, and main electromagnetic mechanism 13 in sequence from the bottom side of the hole to the hole mouth side. The sealing barrel cover 4 has an outer diameter of 63 mm and a thickness of 1.0 mm, and is a hollow barrel that is close to the inner wall of the device housing 1. When it moves toward the hole mouth side, it is restricted by the limiting step 14, and when it moves to the step position, the punching nozzle 5 is closed; when it moves toward the bottom side of the hole, it is restricted by the channel of the connecting rod 11, and when it moves to the rod channel close to the bottom end of the hole, the punching nozzle 5 is opened.

[0046] One end of the connecting rod 11 is rigidly connected to the sealing barrel cover 4, and the other end is rigidly connected to the main servo valve body 12. The main servo valve body 12 controls the sealing barrel cover 4 to reciprocate axially along the inner wall of the device housing 1 along the mining electric-controlled high-pressure water jet equivalent cross-section adjustment device through the connecting rod 11. The connecting rod 11 channels are three connecting rod 11 running channels extending in the axial direction in the center tube 15 and spaced 120 degrees apart.

[0047] The auxiliary electromagnetic mechanism 7, the auxiliary servo spring 8, and the auxiliary servo valve body 9 control the auxiliary servo valve body 9 to move forward and backward through the braking force of the auxiliary electromagnetic mechanism 7 and the prestress of the auxiliary servo spring 8, so as to close and open the compensation channel 3. The compensation channel 3 is a flow channel passing through the center of the central tube 15, the shell 1 of the communication device, the annular channel between the central tube 15 and the bottom side of the main servo valve body 12, and the diameter of the compensation channel 3 is 2.0 mm.

[0048] In this embodiment, when the auxiliary servo valve body 9 moves toward the bottom of the hole, the compensation channel 3 is opened. At this time, the main servo valve body 12 keeps in contact with the high-pressure fluid in the annular channel. The static pressure of the high-pressure fluid generates a force pointing to the orifice side on the bottom of the hole side of the main servo valve body 12, which, together with the force of the main servo spring 10 and the braking force of the main electromagnetic mechanism 13, keeps the sealing barrel cover 4 at the position of the limit step 14, thereby keeping the punching nozzle 5 closed, and realizing the reduction of the flow section of the electric-controlled high-pressure water jet equivalent section regulating device for mining. When the auxiliary servo valve body 9 moves toward the orifice side, the compensation channel 3 is closed. At this time, the main servo valve body 12 is out of contact with the high-pressure fluid in the annular channel, and the force directed to the orifice side generated by the main servo valve body 12 on the bottom of the hole disappears. At this time, the braking force of the synchronously controlled main electromagnetic mechanism 13 is directed in the opposite direction to the bottom side of the hole. Under the joint action of the high-pressure fluid impact force in the annular channel, the force of the main servo spring 10 is overcome, so that the sealing barrel cover 4 moves from the position of the limit step 14 to the bottom side of the hole, thereby keeping the punching nozzle 5 open, thereby realizing an increase in the flow section of the mining electric-controlled high-pressure water jet equivalent section adjustment device.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. An electrically controlled high-pressure water jet equivalent cross-section adjustment device for mining, characterized in that: include: Device housing (1); A compensation channel (3) is located in the device housing (1); A sealing barrel cover (4) is located inside the device housing (1); A punching nozzle (5) and a slitting nozzle (6) are located on the device housing (1); The main electromagnetic mechanism (13), the main servo valve body (12), and the main servo spring (10) are located between the sealing barrel cover (4) and the device housing (1); The auxiliary electromagnetic mechanism (7), the auxiliary servo valve body (9), and the auxiliary servo spring (8) are located in the compensation channel (3); A connecting rod (11) connects the sealing barrel cover (4) and the main servo valve body (12); A central tube (15) passing through the device housing (1) and the sealing barrel cover (4); A connecting rod channel (18) is located in the central tube (15); The main electromagnetic mechanism (13) directly controls the main servo valve body (12) to move forward and backward toward the bottom of the hole and the orifice, thereby driving the connecting support rod (11) and the sealing barrel cover (4) to move forward and backward toward the bottom of the hole and the orifice, thereby realizing the opening and closing of the punching nozzle (5), thereby realizing the equivalent cross-section adjustment of the high-pressure water jet device; the auxiliary electromagnetic mechanism (7) controls the auxiliary servo valve body (9) to move forward and backward toward the bottom of the hole and the orifice, thereby realizing the opening and closing of the intersection of the compensation channel (3) through the auxiliary servo valve body (9).

2. The electric-controlled high-pressure water jet equivalent cross-section adjustment device for mining according to claim 1 is characterized in that: The device housing (1) is provided with two rows of nozzles, the first row on the orifice side is a punching nozzle (5), comprising two small-diameter nozzles, which are arranged symmetrically at 180 degrees; the second row is a slit nozzle (6), comprising four large-diameter nozzles, which are arranged in sequence at intervals of 90 degrees from each other.

3. The electric-controlled high-pressure water jet equivalent cross-section adjustment device for mining according to claim 1 is characterized in that: A stopper (2) is provided between the device housing (1) and the central tube (15) for fixing the device housing (1) and the central tube (15).

4. The electric-controlled high-pressure water jet equivalent cross-section adjusting device for mining according to claim 3 is characterized in that: The stoppers (2) are spaced 120 degrees apart from each other and are provided in three groups, each group consisting of three stoppers (2) which are rigidly connected to the central tube (15) and the device housing (1) via fixing bolts (16) and fixing steps (17).

5. The electric-controlled high-pressure water jet equivalent cross-section adjusting device for mining according to claim 1 is characterized in that: The punching nozzle (5) and the slitting nozzle (6) penetrate the device housing (1) and are rigidly connected to the device housing (1) via threads; the limiting step (14) is fixedly arranged inside the device housing (1) and below the punching nozzle (5) on the side of the orifice.

6. The electric-controlled high-pressure water jet equivalent cross-section adjusting device for mining according to claim 1 is characterized in that: The compensation channel (3) is four mutually perpendicular pipes that penetrate from the surface to the geometric center of the center tube (15), are externally connected to the annular channel between the device housing (1) and the center tube (15), and are internally connected to the main servo valve body (12) near the bottom of the hole.

7. The electric-controlled high-pressure water jet equivalent cross-section adjusting device for mining according to claim 6 is characterized in that: When the compensation passage (3) is opened, the high-pressure fluid in the annular passage between the device housing (1) and the center tube (15) enters the main servo valve body (12) near the bottom of the hole. The pressure of the high-pressure fluid is consistent with the force of the main servo spring (10) and the braking force direction of the main electromagnetic mechanism (13), overcoming the flow impulse in the annular passage between the device housing (1) and the center tube (15), so that the sealing barrel cover (4) is braked at the limit step (14). At this time, the punching nozzle (5) is in a closed state, and the equivalent flow cross section of the high-pressure water jet is reduced. When the channel (3) is closed, the high-pressure fluid in the annular passage between the device housing (1) and the center tube (15) cannot exert static pressure on the main servo valve body (12) near the bottom of the hole, and the main electromagnetic mechanism (13) exerts a force toward the bottom of the hole, which together with the flow impulse in the annular passage between the device housing (1) and the center tube (15) overcomes the force of the main servo spring (10), ensuring that the sealing barrel cover (4) moves toward the bottom of the hole at the limit step (14). At this time, the punching nozzle (5) is in an open and closed state, and the equivalent flow cross section of the high-pressure water jet increases.

8. The electric-controlled high-pressure water jet equivalent cross-section adjusting device for mining according to claim 1 is characterized in that: The main servo spring (10) is fixed to the inner step of the central tube (15) on the side close to the hole bottom, and is fixed to the main servo valve body (12) on the side close to the hole mouth. The main servo spring (10) maintains normal compression. When the punching nozzle (5) is in a closed state, the main servo spring (10) and the main electromagnetic mechanism (13) jointly apply a braking force to brake the sealing barrel cover (4) at the limit step (14), thereby closing the punching nozzle (5); when the punching nozzle (5) is in an open state, the braking force of the main electromagnetic mechanism (13) and the impulse force in the direction of the high-pressure water flow offset the action force of the main servo spring (10), so that the main electromagnetic mechanism hole (13) controls the main servo valve body (12) to move toward the bottom of the hole, thereby opening the punching nozzle (5).

9. The electric-controlled high-pressure water jet equivalent cross-section adjusting device for mining according to claim 1 is characterized in that: The auxiliary servo spring (8) is fixed to the inner step of the center tube (15) on the hole bottom side and is fixed to the auxiliary servo valve body (9) on the hole mouth side. The auxiliary servo spring (8) maintains normal tension, so that the auxiliary servo valve body (9) contracts into the auxiliary electromagnetic mechanism (7) to keep the compensation channel (3) in an open state. When the auxiliary electromagnetic mechanism (7) applies a braking force to the hole mouth side to overcome the pulling force of the auxiliary servo spring (8) to the hole bottom side, the auxiliary servo valve body (9) enters the intersection of the compensation channel (3) and isolates the hydraulic connection between the main servo valve body (12) and the annular channel between the device housing (1) and the center tube (15).

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