Metal wire electric explosion electrode structure and use method thereof

Abstract

The invention discloses a metal wire electric explosion electrode structure and a using method thereof.The structure is applied to explosion drilling and comprises an expansion body and a metal coil, and the expansion body comprises an expansion layer; the metal coil is arranged on the outer side of the expansion layer and electrically connected with an electrode wire. While the expansion body supports the metal coil, when the expansion body enters an explosion drill hole, the metal coil is brought into the expansion drill hole, the metal coil is prevented from being clamped in the explosion drill hole, and the whole metal coil is more easily placed into the explosion drill hole. After the expansion layer in the expansion body expands, the expansion body is switched from the first state to the second state, the expansion body pushes the metal coil to move, the distance between the metal coil and the inner wall of the explosion drill hole is reduced, the attenuation distance of electrical explosion of the metal coil is shortened, shock wave attenuation is reduced, and the metal wire electrical explosion rock breaking effect is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of electric explosion, and in particular relates to a metal wire electric explosion electrode structure and a use method thereof. Background Art

[0002] Drilling and blasting technology based on explosives is an important means of rock excavation. However, the use of explosives is uncontrollable and dangerous, requiring strict approval and preparation measures, and it is difficult to control the rock crushing effect. The toxic gases produced by explosive blasting threaten the health of construction workers. In addition, explosive blasting also produces a lot of noise and smoke, which affects the surrounding environment and residents' lives. In recent years, metal wire electric blasting rock breaking technology has been widely favored by scientific researchers and engineering technicians in the field of geotechnical engineering due to its significant advantages such as high efficiency, safety, green environmental protection, and good controllability, and is expected to replace traditional explosive blasting.

[0003] Both the hydraulic-electric effect rock breaking and the wire electric explosion rock breaking are technologies that convert electrical energy into mechanical energy and then into rock crushing energy. The technical principles are similar and are mostly used under drilling conditions. In the early days, due to the limitation of heavy-frequency wire replacement, the development of wire electric explosion rock breaking was relatively slow compared with the hydraulic-electric effect rock breaking. The hydraulic-electric effect rock breaking is usually combined with drilling. For example, Chinese patents CN202010712177.X, CN201610006523.6, CN202210832819.9, etc. are all technical innovations for the hydraulic-electric effect rock breaking. After the technical difficulties of heavy-frequency wire replacement were solved, the shock wave pressure generated by the wire electric explosion was larger than that of the hydraulic-electric effect rock breaking, and it has been widely used in the development of fossil energy, such as oil well unblocking, reservoir permeability enhancement, and unconventional oil and gas excavation. The hydraulic-electric effect rock breaking is mostly used in indoor rock impact crushing tests and other fields.

[0004] In large-scale, high-intensity rock excavation, wire electric explosion rock breaking technology has not been widely used. The main reason is that compared with explosive blasting, although the shock wave intensity generated by wire electric explosion is higher, the "gas" generated is very limited. The repeated wire replacement technology is mainly aimed at single-wire explosion, which cannot achieve one-time excavation and crushing of rock mass, and can only break rock through repeated impacts. This leads to the wire electric explosion rock breaking mainly based on shock wave rock breaking, which is mainly used for rock fracturing and cannot be used for large-scale rock excavation. The cylindrical or spherical wire array proposed by some scholars can enhance the shock wave intensity and increase the amount of "gas" to a certain extent, and is expected to be used for large-scale rock excavation without considering the problem of repeated wire replacement.

[0005] However, the existing wire array structure is difficult to apply to rock excavation under drilling conditions, mainly manifested in the following aspects: (1) the existing wire array structure is easy to get stuck in the borehole during construction, and it is difficult to put it into the borehole as a whole; (2) the metal wire in the existing metal wire electric explosion electrode structure is far away from the rock of the hole wall, and the strong shock wave decays quickly after being generated. After it propagates to the hole wall, the pressure drops significantly, which is not conducive to rock breaking. Summary of the invention

[0006] The object of the present invention is to provide a metal wire electric explosion electrode structure and a method of using the same to solve the problems existing in the above-mentioned prior art.

[0007] To achieve the above object, the present invention provides a metal wire electric explosion electrode structure, which is applied to explosive drilling, comprising:

[0008] An expansion body, the expansion body comprising an expansion layer;

[0009] A metal coil, the metal coil is limitedly arranged outside the expansion layer, and the metal coil is electrically connected to an electrode wire;

[0010] The expansion layer includes two states, namely a first state and a second state;

[0011] When the expansion layer is in the first state, there is no expansion medium in the expansion layer, and at this time, the cross-sectional area of ​​the expansion layer is the first cross-sectional area;

[0012] When the expansion layer is in the second state, the expansion layer is filled with an expansion medium, and at this time, the cross-sectional area of ​​the expansion layer is a second cross-sectional area;

[0013] The first cross-sectional area is smaller than the second cross-sectional area, and the first cross-sectional area is smaller than the explosive drilling cross-sectional area; the first cross-sectional area, the second cross-sectional area, and the explosive drilling cross-sectional area are all perpendicular to the feeding direction of the expansion body into the explosive drilling.

[0014] Optionally, the expansion medium is water, the expansion body comprises an inner tube, the expansion layer is connected to the inner tube, and the expansion layer absorbs water and switches from the first state to the second state;

[0015] The side of the metal coil close to the explosive drilling entrance end is directly electrically connected to the electrode wire; the side of the metal coil away from the explosive drilling entrance end passes through the inner layer pipe and is electrically connected to the electrode wire.

[0016] Optionally, the inner tube is a circular tube, the expansion layer is an annular sleeve structure, and the expansion layer is sleeved on the outside of the circular tube.

[0017] Optionally, a groove is provided on the outer side of the expansion layer, and the metal coil is arranged in the groove.

[0018] Optionally, the groove is a spiral band-shaped groove, the metal coil is wound in the spiral band-shaped groove by a single-layer indirect winding method, and the metal wire in the metal coil is distributed in the spiral band-shaped groove in a wavy manner.

[0019] Optionally, in the first state, the outer diameter of the expansion body is 10 mm to 20 mm smaller than the inner diameter of the explosive drilling hole.

[0020] Optionally, the inner tube is an insulating tube.

[0021] Optionally, the expansion material of the expansion layer is a water-swellable resin or a water-swellable rubber.

[0022] Optionally, the metal coil is one or more of copper wire, aluminum wire or iron wire.

[0023] A method for using a metal wire electric explosion electrode structure, based on the above-mentioned metal wire electric explosion electrode structure, comprises the following steps:

[0024] S1. Determine the length of the metal wire electric explosion electrode structure and the length of the blockage, and drill the explosion borehole;

[0025] S2. The metal wire electric explosion electrode structure is installed at the bottom of the explosive drill hole, and the electrode wire extends outside the hole;

[0026] S3. The expansion layer of the expansion body expands, and the expansion body pushes the metal coil to move toward the inner wall of the explosive drilling hole;

[0027] S4. Blocking the explosive drilling hole;

[0028] S5. Connect the high-voltage electric pulse discharge device and the electrode wire of the metal wire electric explosion electrode structure to complete the discharge and detonation operation.

[0029] Compared with the prior art, the present invention has the following advantages and technical effects:

[0030] The metal wire electric explosion electrode structure provided by the present invention has an expansion body in a first state, a cross-section of the expansion body being smaller than a cross-section of an explosion hole, that is, the expansion body is smaller than the explosion hole, and because the metal coil is arranged on the outside of the expansion body, while the expansion body supports the metal coil, when the expansion body enters the explosion hole, the metal coil is brought into the expansion hole, thereby preventing the metal coil from being stuck in the explosion hole and making it easier to place the metal coil as a whole into the explosion hole.

[0031] After the expansion layer in the expansion body of the present invention expands, the expansion body switches from the first state to the second state, and the expansion body pushes the metal coil to move, reducing the distance between the metal coil and the inner wall of the explosive borehole, shortening the attenuation distance of the electric explosion of the metal coil, reducing the shock wave attenuation, and being conducive to improving the rock breaking effect of the electric explosion of the metal wire. The present invention can replace the traditional explosive drilling and blasting technology, and has the remarkable characteristics of safety and controllability, green environmental protection, and convenient construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 This is a schematic diagram of the structure of the metal wire electric explosion electrode of the present invention;

[0034] Figure 2 This is a schematic diagram of the use of the metal wire electric explosion electrode structure of the present invention;

[0035] Among them, 1 is the expansion body, 1-1 is the inner tube, 1-2 is the expansion layer, 1-3 is the groove; 2 is the metal coil; 3 is the electrode wire; 4 is the plugging; 5 is the explosive drilling; 6 is the high-voltage electric pulse discharge device; 7 is the rock mass. DETAILED DESCRIPTION

[0036] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0037] like Figure 1 to Figure 2 The present invention provides a metal wire electric explosion electrode structure, which is applied to explosive drilling 5, and includes an expansion body 1 and a metal coil 2; wherein the expansion body 1 includes an expansion layer 1-2; the metal coil 2 is limitedly arranged outside the expansion layer 1-2, and the metal coil 2 is electrically connected to an electrode wire 3;

[0038] The expansion layer 1-2 includes two states, namely a first state and a second state; when the expansion layer 1-2 is in the first state, there is no expansion medium in the expansion layer 1-2, and at this time, the cross-sectional area of ​​the expansion layer 1-2 is a first cross-sectional area; when the expansion layer 1-2 is in the second state, the expansion layer 1-2 is filled with an expansion medium, and at this time, the cross-sectional area of ​​the expansion layer 1-2 is a second cross-sectional area; the first cross-sectional area is smaller than the second cross-sectional area, and the first cross-sectional area is smaller than the cross-sectional area of ​​the explosive borehole 5; the first cross-sectional area, the second cross-sectional area, and the cross-sectional area of ​​the explosive borehole 5 are all perpendicular to the feeding direction of the expansion body 1 entering the explosive borehole 5.

[0039] The metal wire electric explosion electrode structure provided by the present invention has an expansion body in a first state, and a cross-sectional area of ​​the expansion body is smaller than a cross-sectional area of ​​an explosion hole, that is, the expansion body is smaller than the explosion hole, and because the metal coil is limitedly arranged on the outside of the expansion body, the expansion body supports the metal coil while the expansion body brings the metal coil into the expansion hole when entering the explosion hole, thereby preventing the metal coil from being stuck in the explosion hole and making it easier to put the metal coil as a whole into the explosion hole.

[0040] After the expansion layer in the expansion body of the present invention expands, the expansion body switches from the first state to the second state, and the expansion body pushes the metal coil to move, thereby reducing the distance between the metal coil and the inner wall of the explosive borehole, shortening the attenuation distance of the metal coil electric explosion, and reducing the shock wave attenuation, which is beneficial to improving the rock breaking effect of the metal wire electric explosion.

[0041] Further optimized solution, the expansion medium is water, the expansion body 1 includes an inner tube 1-1, the expansion layer 1-2 is connected to the inner tube 1-1, and the expansion layer 1-2 absorbs water and switches from the first state to the second state; the side of the metal coil 2 close to the entrance end of the explosive borehole 5 is directly electrically connected to the electrode wire 3; the side of the metal coil 2 away from the entrance end of the explosive borehole 5 passes through the inner tube 1-1 and is electrically connected to the electrode wire 3. The electrode wires 3 connecting the two ends of the metal coil 2 need to extend outside the explosive borehole 5.

[0042] In this embodiment, the expansion mode of the expansion layer 1-2 in the expansion body 1 is water absorption expansion, and the expansion layer 1-2 absorbs water and expands so that the expansion layer 1-2 switches from the first state to the second state; the expansion body pushes the metal coil 2 to move, reducing the distance between the metal coil and the inner wall of the explosive borehole, and shortening the attenuation distance of the electric explosion of the metal coil. While the inner layer tube 1-1 effectively supports the expansion layer 1-2, it isolates the expansion layer from the internal metal coil 2. The side of the metal coil 2 away from the entrance end of the explosive borehole 5 passes through the inner layer tube 1-1 and is electrically connected to the electrode wire 3, thereby realizing the electrical connection between the metal coil 2 and the two electrode wires 3, so that the metal wire electric explosion can be realized.

[0043] The cross section of the metal wire electric explosion electrode structure is smaller than the cross section of the explosion borehole 5 before absorbing water, so it is convenient to put the metal wire electric explosion electrode structure as a whole into the explosion borehole 5. After absorbing water, the expansion layer 1-2 expands and squeezes the metal coil 2 to the vicinity of the wall of the explosion borehole 5, shortening the attenuation distance of the metal wire electric explosion in the medium, reducing the shock wave attenuation, and being conducive to improving the rock breaking effect of the metal wire electric explosion; before the metal coil 2 is electrically exploded, the expansion layer 1-2 absorbs water, and after the expansion layer 1-2 is electrically exploded, water flows out of the expansion layer 1-2 under the action of the impact pressure, and transmits the impact pressure to the wall of the explosion borehole 5 as a force transmission medium, solving the problem that the water in the explosion borehole 5 is easily lost from the pores and cracks of the rock mass. The present invention can replace the traditional explosive drilling and blasting technology, and has the remarkable characteristics of safety and controllability, green environmental protection, and convenient construction. Of course, the expansion layer 1-2 can also use other expansion media, such as air, liquid and other expansion media. The expansion layer 1-2 switches to the second state by absorbing the expansion medium. For example, the expansion medium uses air. At this time, an air storage structure such as an air storage bag or an air storage layer is arranged inside the expansion layer 1-2. After the air storage structure is filled with gas, the expansion layer 1-2 switches from the first state to the second state.

[0044] Preferably, the inner tube 1-1 is a round tube, the expansion layer 1-2 is an annular sleeve structure, and the expansion layer 1-2 is sleeved on the outside of the round tube. In this embodiment, the inner tube 1-1 is a round tube, the expansion layer 1-2 is an annular sleeve structure and is sleeved on the outside of the round tube. The expansion layer 1-2 of the annular sleeve structure allows it to expand in all directions around the ring, so that the metal coil 2 arranged on the outside of the expansion body 1 can expand in all directions, thereby driving the metal coil 2 to approach the wall of the explosive borehole 5 in all directions, further improving the rock breaking effect of the metal wire electric explosion. Of course, the inner tube 1-1 can also be made of pipes of other shapes, such as pipes with rectangular cross-sections, pipes with elliptical cross-sections, etc.; the expansion layer 1-2 can be used to wrap the inner tube 1-1 in all directions or partially wrap the inner tube 1-1; when directional explosion or local explosion is required, the inner tube 1-1 that is compatible with the explosive borehole 5 can be selected, or the expansion layer 1-2 partially wraps the inner tube 1-1 to achieve the effect of directional explosion or local explosion.

[0045] A further optimized solution is provided with a groove 1-3 on the outside of the expansion layer 1-2, and the metal coil 2 is arranged in the groove 1-3. In this embodiment, the groove 1-3 is provided on the outside of the expansion layer 1-2, and the metal coil 2 is arranged in the groove 1-3, so as to achieve the effect of limiting the position of the metal coil 2, prevent the metal coil 2 from being displaced, and ensure that the metal coil 2 moves toward the wall of the explosive drilling hole 5 along with the expansion layer 1-2 during the expansion process.

[0046] Preferably, the grooves 1-3 are spiral belt-shaped grooves, the metal coil 2 is wound in the spiral belt-shaped grooves by a single-layer indirect winding method, and the metal wires in the metal coil 2 are distributed in the spiral belt-shaped grooves in a wavy manner.

[0047] In this embodiment, the groove 1-3 is a spiral belt-shaped groove, and the groove 1-3 is arranged in an annular and threaded manner on the outside of the expansion layer 1-2. Only one metal coil 2 is used and is annularly wound in the spiral belt-shaped groove. The annularly arranged metal coil 2 has a certain fastening force, which improves the connection between the metal coil 2 and the expansion layer 1-2, further prevents the metal coil 2 from being displaced in the feeding direction of the expansion body 1, and ensures that the metal coil 2 moves toward the wall of the explosive drilling hole 5 with the expansion layer 1-2 during the expansion process of the expansion layer 1-2. And the metal coil 2 is distributed in a spiral belt shape with the groove 1-3, which increases the length of the metal coil 2 within the unit length of the expansion body 1, and further improves the rock-breaking effect of the metal wire electric explosion. At the same time, because the metal wire in the metal coil 2 is distributed in a wave-like manner in the spiral belt-shaped groove, the length of the metal coil 2 within the unit length of the expansion body 1 is further increased, which helps to increase the initial shock wave intensity and further improve the rock-breaking effect of the metal wire electric explosion. At the same time, the spacing between the axes of adjacent coils is 5cm to 20cm, and the length of the metal wire is adjusted by adjusting the spacing between adjacent coils, thereby regulating the rock-breaking effect.

[0048] Of course, the number of grooves 1-3 can be set in multiples, and the shapes and directions of the grooves 1-3 can be selected in different ways. When the local explosion intensity needs to be strengthened or weakened, the number of grooves can be increased or decreased at the position where the local explosion intensity needs to be strengthened or weakened, and grooves with different directions can be selected, so as to increase or decrease the number of metal wires in the local area, thereby effectively controlling the explosion intensity.

[0049] Further optimization scheme, in the first state, the outer diameter of the expansion body 1 is 10mm to 20mm smaller than the inner diameter of the explosive borehole 5; the diameter of the inner layer round tube is 10 to 20mm, and the thickness is 0.2 to 1.0mm. By controlling the size relationship between the expansion body 1 and the explosive borehole 5 in the first state, it is ensured that the expansion body 1 and the metal coil 2 can easily enter the explosive borehole 5 in the first state, and at the same time, the deformation displacement of the expansion layer 1-2 during the expansion process is reduced, thereby ensuring that the expansion body 1 in the second state, the metal coil 2 can fit with the inner wall of the explosive borehole 5, so that the metal coil 2 can directly act on the rock wall during the electric explosion, and further improve the rock breaking effect of the metal wire electric explosion.

[0050] To further optimize the solution, the inner tube 1-1 is an insulating tube, and a plastic tube or a rubber tube can be selected to ensure insulation inside and outside the inner tube 1-1, and protect the internal structure of the inner tube 1-1 from being damaged by high voltage current.

[0051] In a further optimized solution, the expansion material of the expansion layer 1-2 of the expansion body 1 is a water-swellable resin or a water-swellable rubber. The water-swellable resin or the water-swellable rubber has a certain strength and can drive the metal coil 2 to move when it is deformed and displaced by absorbing water.

[0052] In a further optimized solution, the metal coil 2 is one or more of copper wire, aluminum wire or iron wire. The diameter of the metal wire of the metal coil 2 is 0.1 mm to 1.0 mm. The metal coil 2 can undergo electrical explosion.

[0053] A method for using a metal wire electric explosion electrode structure, based on the above-mentioned metal wire electric explosion electrode structure, comprises the following steps:

[0054] S1. According to the rock mass conditions and blasting needs, design a wire electric explosion rock crushing program, and according to the wire electric explosion rock crushing party, determine the wire electric explosion electrode structure length and plug length 4, and drill the explosion borehole 5;

[0055] S2. The metal wire electric explosion electrode structure is installed into the bottom of the explosion drill hole 5, and the electrode line 3 extends outside the hole;

[0056] S3. The expansion layer 1-2 of the expansion body 1 expands, and the expansion body 1 pushes the metal coil 2 to move toward the inner wall of the explosive borehole 5; in the present technical solution, water is injected into the explosive borehole 5, and the expansion layer 1-2 absorbs water and expands, so that the expansion layer 1-2 switches from the first state to the second state, and the expansion layer 1-2 moves the metal coil 2 to the inner wall of the explosive borehole 5 and fits therewith;

[0057] S4. Blocking the explosive borehole 5 4; using drilling cuttings or blasthole materials to complete the blocking work 4.

[0058] S5. Connect the high-voltage electric pulse discharge device 6 to the electrode line 3 of the metal wire electric explosion electrode structure to complete the discharge detonation operation and break the rock mass.

[0059] The first cross section of the expansion layer 1-2 is smaller than the cross section of the explosive borehole, that is, the expansion body is smaller than the explosive borehole. While the expansion body supports the metal coil, the expansion body brings the metal coil into the expansion borehole when entering the explosive borehole, so as to avoid the metal coil from being stuck in the explosive borehole, and it is easier to put the metal coil as a whole into the explosive borehole. Water is injected into the explosive borehole 5, and the expansion body 1 pushes the metal coil 2 to move, reducing the distance between the metal coil 2 and the inner wall of the explosive borehole 5, shortening the attenuation distance of the electric explosion of the metal coil 2, reducing the shock wave attenuation, and being conducive to improving the rock breaking effect of the electric explosion of the metal wire. The present invention can replace the traditional explosive drilling and blasting technology, and has the remarkable characteristics of safety and controllability, green environmental protection, and convenient construction.

[0060] Let’s use a specific scenario to illustrate:

[0061] The high side wall of a hydropower underground powerhouse is excavated, and the surrounding rock damage control is strict. Traditional explosive blasting not only easily causes surrounding rock damage, but also produces toxic gas and dust, threatening the life and health of on-site construction workers. It is proposed to use the metal wire electric explosion electrode structure under the drilling condition of the present invention to carry out rock excavation. The borehole diameter is 90mm and the depth is 6.0m.

[0062] The present invention discloses a metal wire electric explosion electrode structure under drilling conditions, comprising an expansion body 1 and a metal coil 2, wherein the expansion body 1 comprises an expansion layer 1-2; the metal coil 2 is arranged on the outside of the expansion body 1, and the metal coil 2 is electrically connected to an electrode wire 3; the expansion body 1 is an expansion body 1, and the expansion body 1 comprises an inner layer tube 1-1, and the expansion layer 1-2 is connected to the inner layer tube 1-1, and the expansion layer 1-2 in the expansion body 1 absorbs water and expands to switch the expansion body 1 from a first state to a second state; the side of the metal coil 2 close to the entrance end of the explosive drilling hole 5 is directly electrically connected to the electrode wire 3; the side of the metal coil 2 away from the entrance end of the explosive drilling hole 5 passes through the inner layer tube 1-1 and is electrically connected to the electrode wire 3. The inner layer tube 1-1 is a round tube, and the expansion layer 1-2 is an annular sleeve structure, and the expansion layer 1-2 is sleeved on the outside of the round tube. A spiral belt-shaped groove is opened on the outside of the expansion layer 1-2, and the metal coil 2 is wound in the spiral belt-shaped groove by a single-layer indirect winding method, and the metal wire in the metal coil 2 is distributed in the spiral belt-shaped groove in a wavy manner.

[0063] In the first state, the outer diameter of the expansion body 1 is 10 mm smaller than the inner diameter of the explosive drilling hole 5, the diameter of the inner round tube is 20 mm, the thickness is 0.5 mm, and the inner tube 1-1 is a PVC tube (plastic tube). The expansion material of the expansion layer 1-2 of the expansion body 1 is a water-absorbing resin, and the metal coil is wound in the spiral belt-shaped groove on the surface of the expansion body 1 by a single-layer indirect winding method. The metal wire in the groove is wavy, and the spacing between adjacent coil axes is 8 cm. The diameter of the metal wire in the metal coil 2 is 0.3 mm, and the metal wire used to make the metal coil is copper wire.

[0064] The description of the above embodiments is only used to help understand the method of the present invention and its core concept; at the same time, for a person skilled in the art, according to the concept of the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of the specification of the present invention should not be understood as a limitation of the present invention.

[0065] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0066] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0067] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A metal wire electric explosion electrode structure, characterized in that: Applications for explosive drilling (5), including: An expansion body (1), the expansion body (1) comprising an expansion layer (1-2); A metal coil (2), the metal coil (2) being limitedly arranged outside the expansion layer (1-2), and the metal coil (2) being electrically connected to an electrode wire (3); The expansion layer (1-2) comprises two states, namely a first state and a second state; When the expansion layer (1-2) is in a first state, there is no expansion medium in the expansion layer (1-2), and at this time, the cross-sectional area of ​​the expansion layer (1-2) is a first cross-sectional area; When the expansion layer (1-2) is in the second state, the expansion layer (1-2) is filled with an expansion medium, and at this time, the cross-sectional area of ​​the expansion layer (1-2) is a second cross-sectional area; The first cross-sectional area is smaller than the second cross-sectional area, and the first cross-sectional area is smaller than the cross-sectional area of ​​the explosive borehole (5); the first cross-sectional area, the second cross-sectional area, and the cross-sectional area of ​​the explosive borehole (5) are all perpendicular to the feeding direction of the expansion body (1) entering the explosive borehole (5).

2. The metal wire electric explosion electrode structure according to claim 1, characterized in that: The expansion medium is water, the expansion body (1) comprises an inner tube (1-1), the expansion layer (1-2) is connected to the inner tube (1-1), and the expansion layer (1-2) absorbs water to switch from a first state to a second state; The side of the metal coil (2) close to the entrance end of the explosive drilling hole (5) is directly electrically connected to the electrode wire (3); the side of the metal coil (2) away from the entrance end of the explosive drilling hole (5) passes through the inner layer tube (1-1) and is electrically connected to the electrode wire (3).

3. The metal wire electric explosion electrode structure according to claim 2, characterized in that: The inner tube (1-1) is a circular tube, the expansion layer (1-2) is an annular sleeve structure, and the expansion layer (1-2) is sleeved on the outside of the circular tube.

4. The metal wire electric explosion electrode structure according to claim 3, characterized in that: A groove (1-3) is provided on the outer side of the expansion layer (1-2), and the metal coil (2) is arranged in the groove (1-3).

5. The metal wire electric explosion electrode structure according to claim 4, characterized in that: The grooves (1-3) are spiral belt-shaped grooves, the metal coil (2) is wound in the spiral belt-shaped grooves by a single-layer indirect winding method, and the metal wires in the metal coil (2) are distributed in the spiral belt-shaped grooves in a wavy manner.

6. The metal wire electric explosion electrode structure according to claim 3, characterized in that: In the first state, the outer diameter of the expansion body (1) is 10 mm to 20 mm smaller than the inner diameter of the explosive drilling hole (5).

7. The metal wire electric explosion electrode structure according to claim 2, characterized in that: The inner layer tube (1-1) is an insulating tube.

8. The metal wire electric explosion electrode structure according to claim 2, characterized in that: The expansion material of the expansion layer (1-2) is a water-swellable resin or a water-swellable rubber.

9. The metal wire electric explosion electrode structure according to claim 1, characterized in that: The metal coil (2) is one or more of copper wire, aluminum wire or iron wire.

10. A method for using a metal wire electric explosion electrode structure, based on the metal wire electric explosion electrode structure according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Determine the length of the metal wire electric explosion electrode structure and the length of the blockage (4), and drill the explosion borehole (5); S2. The metal wire electric explosion electrode structure is installed into the bottom of the explosion drill hole (5), and the electrode wire (3) extends outside the hole; S3. The expansion layer (1-2) of the expansion body (1) expands, and the expansion body (1) pushes the metal coil (2) to move toward the inner wall of the explosive drilling hole (5); S4. Blocking the explosive drilling hole (5) (4); S5. Connect the high-voltage electric pulse discharge device (6) to the electrode line (3) of the metal wire electric explosion electrode structure to complete the discharge detonation operation.

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