Coaxial pulse injection device

Abstract

The invention discloses a coaxial pulse injection device, which comprises a coaxial pulse generation structure main body, a power control unit and an energy transmission coaxial cable, and is characterized in that an inner core conductor and an outer layer conductor are fixedly mounted in the coaxial pulse generation structure main body; a connector used for being connected with a drill rod is fixedly installed at the upper end of the coaxial pulse generation structure body, the upper end of the connector fixedly communicates with a butt joint port, the energy transmission coaxial cable comprises an inner conductor, an outer shielding layer and an insulating layer, and the power control unit comprises a pulse power module, a pulse forming network and a switch triggering module. The pulse energy is injected into the coal seam through the energy coupling electrode, so that the coal seam is cracked and broken, the coal seam or the rock stratum is cracked and broken, the drilling resistance of the coal seam or the rock stratum is reduced, the drilling speed is increased, and the coal mining efficiency is remarkably improved; the pulse energy injection can reduce the gas pressure of the coal seam and reduce the risk of gas outburst.

Description

Technical Field

[0001] The invention relates to the technical field of coal mining, in particular to a coaxial pulse injection device. Background Art

[0002] Coal mining refers to the series of engineering activities that involve extracting and utilizing coal resources from underground or on the surface. Coal is a combustible solid mineral formed over long geological periods by the gradual transformation of ancient plant remains under specific conditions of temperature and pressure. The goal of coal mining is to access these buried coal resources to meet the energy needs of human production and daily life.

[0003] Traditional coal mining often faces numerous challenges. For example, encountering hard rock formations can lead to severe drill bit wear and slow mining progress; high coal seam gas content can easily cause safety hazards such as gas explosions; and the instability of coal seam roofs and floors can lead to geological disasters such as roof collapse and rock spalling.

[0004] However, in actual use of existing technologies, although there are some auxiliary mining technologies, such as hydraulic fracturing and blasting, these methods have certain limitations. For example, hydraulic fracturing has a large demand for water resources and may pollute groundwater; blasting operations have great safety risks, and it is difficult to accurately control the scope of damage to the surrounding rock mass. Summary of the Invention

[0005] The purpose of the present invention is to provide a coaxial pulse injection device to solve the problem raised in the above background technology that although there are some auxiliary mining technologies, such as hydraulic fracturing and blasting, these methods have certain limitations. For example, hydraulic fracturing has a large demand for water resources and may pollute groundwater; blasting operations have a large safety risk and it is difficult to accurately control the scope of damage to the surrounding rock mass.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: comprising a coaxial pulse generating structure body, a power control unit and an energy transmission coaxial cable, wherein an inner core conductor and an outer conductor are fixedly installed inside the coaxial pulse generating structure body, respectively; a connector for connecting a drill pipe is fixedly installed at the upper end of the coaxial pulse generating structure body, and a docking port is fixedly connected to the upper end of the connector; the energy transmission coaxial cable comprises an inner conductor, an outer shielding layer and an insulating layer; the power control unit comprises a pulse power supply module, a pulse forming network and a switch trigger module;

[0007] A pulse injection drill bit is fixedly installed at the bottom of the coaxial pulse generating structure body, an energy coupling electrode is fixedly installed on the outer side of the lower end of the pulse injection drill bit, a heat dissipation channel is opened inside the pulse injection drill bit, and monitoring sensors for monitoring the operating status are respectively fixedly installed inside the coaxial pulse generating structure body and the pulse injection drill bit.

[0008] Preferably, the inner core conductor is located on the central axis of the outer conductor, the inner core conductor and the outer conductor are isolated by an insulating filling material, the inner core conductor is made of a metal material with high conductivity, and the outer conductor is made of a metal shielding material.

[0009] Preferably, an external thread is provided at the outer end of the connector, and the upper end of the docking port is connected to an external power control unit via an energy transmission coaxial cable.

[0010] Preferably, the inner conductor cable is made of a copper alloy material with high conductivity, the inner conductor is coated with a wear-resistant and corrosion-resistant protective coating, the outer shielding layer is composed of a metal braided mesh and a metal sheath, and the insulating layer is made of a high-performance insulating material.

[0011] Preferably, the pulse power supply module adopts a high-energy-density supercapacitor group as an energy storage element, the pulse forming network is composed of inductor and capacitor elements, and the switch trigger module adopts a high-speed, high-reliability gas switch or semiconductor switch as a switching element.

[0012] Preferably, the pulse injection drill bit is made of a high-strength, high-hardness alloy material, and there are several energy coupling electrodes, which are symmetrically distributed from the upper conductor on the outer side of the lower end of the pulse injection drill bit.

[0013] Preferably, the heat dissipation channels are distributed in a downward spiral shape, and coolant circulates inside the heat dissipation channels.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] When the connector of the present invention is coaxially connected to the bottom of the drill rod of the drilling rig, the coaxial pulse generating structure body will be fixed to the bottom of the drill rod. When the coaxial pulse generating structure body is fixed to the bottom of the drill rod, the coaxial pulse generating structure body and the energy transmission coaxial cable connected to the upper end of the docking interface are transported to the coal seam inside the mine by turning on the drilling rig. When the coaxial pulse generating structure body is transported to the coal seam inside the mine, it is controlled by an external power control unit and a pulse signal is generated. The generated pulse energy is transported to the coaxial pulse generating structure body and the pulse injection drill bit through the energy transmission coaxial cable. When the pulse energy is transported to the coaxial pulse generating structure body and the pulse injection drill bit, the pulse energy is injected into the coal seam through the energy coupling electrode, causing the coal seam to crack and break, causing the coal seam or rock formation to crack and break, reducing the drilling resistance of the coal seam or rock formation, and increasing the drilling speed, thereby significantly improving the coal mining efficiency; the pulse energy injection can reduce the gas pressure of the coal seam and reduce the risk of gas outburst;

[0016] The present invention also improves the stability of the coal seam roof and floor, reduces the probability of geological disasters such as roof collapse and rock spalling, and ensures the safe mining of coal mines. Compared with traditional blasting operations, the present invention adopts the method of pulse energy injection, which does not generate a large amount of dust, noise and harmful gases, has little impact on the environment underground in coal mines, and meets the requirements of green mining. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The main structure of the coaxial pulse generating structure of the present invention is shown in FIG. Figure 1 ;

[0018] Figure 2 The main structure of the coaxial pulse generating structure of the present invention is shown in FIG. Figure 2 ;

[0019] Figure 3 It is a schematic cross-sectional view of the main structure of the coaxial pulse generating structure of the present invention.

[0020] In the figure: 1. Coaxial pulse generating structure body; 101. Inner core conductor; 102. Outer conductor; 2. Connector; 3. Docking port; 4. Pulse injection drill bit; 401. Energy coupling electrode; 402. Heat dissipation channel. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] See also Figure 1-3 The present invention provides a technical solution: comprising a coaxial pulse generating structure body 1, a power control unit and an energy transmission coaxial cable, wherein an inner core conductor 101 and an outer conductor 102 are fixedly installed inside the coaxial pulse generating structure body 1, the inner core conductor 101 is located on the central axis of the outer conductor 102, and the inner core conductor 101 and the outer conductor 102 are isolated by an insulating filling material to form a coaxial pulse transmission structure, the inner core conductor 101 is made of a metal material with high conductivity, so that the resistance loss during energy transmission is reduced by the metal material with high conductivity, the outer conductor 102 is made of a metal shielding material, the metal shielding material has good electromagnetic shielding performance, and can effectively reduce electromagnetic radiation leakage, the insulating filling material adopts a material with high dielectric constant and low loss to ensure the characteristic impedance stability of the coaxial pulse transmission line and improve the energy transmission efficiency;

[0023] A connector 2 for connecting a drill pipe is fixedly installed on the upper end of the coaxial pulse generating structure main body 1, and an external thread is provided at the outer end of the connector 2, so that a coaxial connection is made with the bottom of the drill pipe of the drilling rig through the connector 2. The upper end of the connector 2 is fixedly connected to a docking port 3, and the upper end of the docking port 3 is connected to an external power control unit through an energy transmission coaxial cable.

[0024] The energy transmission coaxial cable includes an inner conductor, an outer shielding layer and an insulation layer. The inner conductor cable is made of a high-conductivity copper alloy material. The high-conductivity copper alloy material has good electrical conductivity and can reduce the resistance loss of energy during transmission. The inner conductor is coated with a wear-resistant and corrosion-resistant protective coating. The protective coating improves the wear resistance and corrosion resistance of the inner conductor to adapt to the harsh environment underground in coal mines; the outer shielding layer is composed of a metal braided mesh and a metal sheath. The metal braided mesh has good flexibility and shielding performance, which can effectively reduce electromagnetic radiation leakage and prevent interference with surrounding electronic equipment. The metal sheath provides additional mechanical protection and enhances the cable's compressive and tensile strength; the insulation layer is made of high-performance insulation material. The high-performance insulation material has high insulation strength, low dielectric loss and good heat resistance, ensuring that energy is transmitted stably and efficiently in the energy transmission coaxial cable.

[0025] The power control unit includes a pulse power supply module, a pulse forming network and a switch trigger module. The pulse power supply module uses a high-energy-density supercapacitor group as an energy storage element. The energy storage element can store a large amount of electrical energy in a short period of time. At the same time, it is equipped with an efficient charging circuit to quickly charge the energy storage element to meet the needs of continuous pulse output; the pulse forming network is composed of inductor and capacitor elements, which form pulse signals with specific shapes and parameters, such as pulse amplitude, pulse width and pulse repetition frequency, which can be adjusted according to actual mining needs; the switch trigger module uses high-speed, high-reliability gas switches or semiconductor switches as switching elements.

[0026] A pulse injection drill bit 4 is fixedly installed at the bottom of the coaxial pulse generating structure body 1. The pulse injection drill bit 4 is made of a high-strength, high-hardness alloy material, which makes the pulse injection drill bit 4 have good wear resistance and impact resistance and can adapt to the complex geological conditions in the coal mine. An energy coupling electrode 401 is fixedly installed on the outer side of the lower end of the pulse injection drill bit 4, and there are several energy coupling electrodes 401, which are symmetrically distributed from the upper wire on the outer side of the lower end of the pulse injection drill bit 4. The energy coupling electrode 401 ensures that the pulse energy can be evenly and effectively injected into the coal seam or rock formation. A heat dissipation channel 402 is opened inside the pulse injection drill bit 4, and the heat dissipation channel 402 is distributed in a downward spiral shape. Cooling liquid circulates inside the heat dissipation channel 402. Monitoring sensors for monitoring the operating status are fixedly installed inside the coaxial pulse generating structure body 1 and the pulse injection drill bit 4, respectively, so that the pulse amplitude, width, repetition frequency, coaxial pulse, current, voltage and pressure and temperature of the pulse injection drill bit 4 of the coaxial pulse generating structure body 1 can be monitored by the monitoring sensor.

[0027] During use, according to the geological conditions and mining requirements of the coal mine, appropriate pulse output parameters such as pulse amplitude, width and repetition frequency are set through the power control unit. When the pulse output parameters are set, the connector 2 is coaxially connected to the bottom of the drill rod of the drill rig. When the connector 2 is coaxially connected to the bottom of the drill rod of the drill rig, the coaxial pulse generating structure body 1 will be fixed to the bottom of the drill rod. When the coaxial pulse generating structure body 1 is fixed to the bottom of the drill rod, the energy transmission coaxial cable connected to the coaxial pulse generating structure body 1 and the upper end of the docking port 3 is transmitted to the coal seam in the mine by turning on the drill rig. When the coaxial pulse generating structure body 1 is transmitted to the coal seam in the mine, it is controlled by an external power control unit and a pulse signal is generated. The generated pulse energy is transmitted to the coaxial pulse generating structure body 1 and the pulse injection drill bit 4 through the energy transmission coaxial cable. When the pulse energy is transmitted to the coaxial pulse generating structure body 1 and the pulse injection drill bit 4, the pulse energy is injected into the coal seam through the energy coupling electrode 401, causing cracks and breakage in the coal seam.

[0028] The present invention injects pulse energy into the coal seam or rock stratum to cause cracks and fragments in the coal seam or rock stratum, thereby reducing the drilling resistance of the coal seam or rock stratum and increasing the drilling speed, thereby significantly improving the efficiency of coal mining; pulse energy injection can reduce the gas pressure of the coal seam and reduce the risk of gas outburst; at the same time, it improves the stability of the coal seam roof and floor, reduces the probability of geological disasters such as roof collapse and rock spalling, and ensures the safe conduct of coal mining; compared with traditional blasting operations, the present invention adopts the method of pulse energy injection, which does not generate a large amount of dust, noise and harmful gases, has little impact on the environment underground in the coal mine, and meets the requirements of green mining.

[0029] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0030] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A coaxial pulse injection device, characterized in that: The invention comprises a coaxial pulse generating structure body (1), a power control unit and an energy transmission coaxial cable, wherein an inner core conductor (101) and an outer conductor (102) are fixedly installed inside the coaxial pulse generating structure body (1), a connector (2) for connecting a drill pipe is fixedly installed at the upper end of the coaxial pulse generating structure body (1), and a docking port (3) is fixedly connected at the upper end of the connector (2), the energy transmission coaxial cable comprises an inner conductor, an outer shielding layer and an insulating layer, and the power control unit comprises a pulse power supply module, a pulse forming network and a switch trigger module; A pulse injection drill bit (4) is fixedly mounted on the bottom of the coaxial pulse generating structure main body (1), an energy coupling electrode (401) is fixedly mounted on the outer side of the lower end of the pulse injection drill bit (4), a heat dissipation channel (402) is provided inside the pulse injection drill bit (4), and monitoring sensors for monitoring the operating status are fixedly mounted inside the coaxial pulse generating structure main body (1) and the pulse injection drill bit (4), respectively.

2. A coaxial pulse injection device according to claim 1, characterized in that: The inner core conductor (101) is located on the central axis of the outer conductor (102); the inner core conductor (101) and the outer conductor (102) are isolated by an insulating filling material; the inner core conductor (101) is made of a metal material with high conductivity, and the outer conductor (102) is made of a metal shielding material.

3. A coaxial pulse injection device according to claim 2, characterized in that: The outer end of the connector (2) is provided with an external thread, and the upper end of the docking port (3) is connected to an external power control unit via an energy transmission coaxial cable.

4. The coaxial pulse injection device according to claim 3, characterized in that: The inner conductor cable is made of a copper alloy material with high conductivity, the inner conductor is coated with a wear-resistant and corrosion-resistant protective coating, the outer shielding layer is composed of a metal braided mesh and a metal sheath, and the insulating layer is made of a high-performance insulating material.

5. The coaxial pulse injection device according to claim 4, characterized in that: The pulse power supply module uses a high-energy-density supercapacitor group as an energy storage element, the pulse forming network is composed of inductor and capacitor elements, and the switch trigger module uses a high-speed, high-reliability gas switch or semiconductor switch as a switching element.

6. The coaxial pulse injection device according to claim 5, characterized in that: The pulse injection drill bit (4) is made of a high-strength, high-hardness alloy material, and the energy coupling electrodes (401) are in a plurality and are symmetrically distributed in sequence from the upper conductor on the outer side of the lower end of the pulse injection drill bit (4).

7. The coaxial pulse injection device according to claim 6, characterized in that: The heat dissipation channel (402) is distributed in a downward spiral shape, and a coolant circulates inside the heat dissipation channel (402).

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