A mining device and method for irregular-shaped zones of ore and rock based on a combined discharge module

Abstract

The application provides a mining device and method for irregular zones of ore and rock based on combined discharge modules, and relates to the technical field of rock breaking. The device comprises a plurality of combined basic discharge modules. The basic discharge module comprises a capacitor and a basic electrode connected to the positive and negative electrodes of the capacitor. The basic discharge module comprises a square basic discharge module, a semicircular basic discharge module, a fan-shaped basic discharge module and a triangular basic discharge module. A plurality of basic discharge modules are combined through the side of the capacitor. The shape of the basic electrode is adapted to the shape of the cross section of the capacitor. The application adopts the method of combining various shapes of operation zones by splicing the integrated capacitor electrode basic discharge modules, and has high flexibility, strong expandability and easy formation of large irregular operation zones. The application has a smaller device size, lower cost, more rich operation zone shapes and cross section sizes, and is more efficient for hard rock mining.

Description

Technical Field

[0001] The present invention relates to the field of rock crushing technology, and in particular to a device and method for mining irregular-shaped areas of ore and rock based on a combined discharge module. Background Art

[0002] Commonly used methods in the field of rock crushing and tunnel excavation include explosive crushing and mechanical crushing. The general process of explosive crushing is to drill holes in the rock mass, charge explosives, detonate explosives, and then crush the rock and peel it off from the rock mass. The explosive mining operation area is controlled by the explosive loading position and amount. Affected by factors such as the mechanical properties of the rock and the blasting design, the shape of the operation area produced by explosive crushing is difficult to accurately control, and the process is complex. In mechanical crushing methods, most of the time, the rotation and cutting of the tool are used to crush the rock and peel it off from the rock mass. It is naturally easy to form a circular operation area but not easy to form other types of operation areas. In addition, the mechanical crushing method causes severe wear on the cutter head when encountering hard boulders or construction in hard rock, and the excavation efficiency is extremely low.

[0003] CN112044569B discloses a combined multi-electrode high-voltage pulse discharge device and a method for crushing hard rock. The rock is crushed by drilling holes in the rock and then inserting electrodes for discharge. However, this rock crushing method has certain shortcomings. When CN112044569B crushes the rock, it is necessary to drill holes in the rock first, which is a cumbersome process; CN112044569B does not have an insulating liquid environment, and it is not easy to use liquid flow to discharge the crushed rock; when operating in large and irregular areas, a higher pulse high voltage is required. At this time, the cost of the pulse power meter is huge, and the insulation of related high-voltage components is difficult. In CN112044569B, it is impossible to increase the voltage endlessly to increase the crushing area. Summary of the Invention

[0004] To address the technical issues related to the aforementioned rock crushing solutions being inconvenient for operating in irregularly shaped working areas, a device and method for mining irregularly shaped rock areas based on modular discharge modules is provided. This invention primarily utilizes a method of splicing and combining basic discharge modules with integrated capacitor electrodes to create various shaped working areas, thereby achieving the desired effect of adapting to various irregularly shaped mining work areas.

[0005] The technical means adopted in the present invention are as follows:

[0006] A mining device for irregular-shaped mineral rock areas based on a combined discharge module includes: several combined basic discharge modules, the basic discharge module includes a capacitor and a basic electrode connected to the positive and negative poles of the capacitor, the basic electrode includes a first electrode and a second electrode, when the first electrode is a positive electrode, the second electrode is a negative electrode; when the first electrode is a negative electrode, the second electrode is a positive electrode, the basic discharge module includes a square basic discharge module, a semicircular basic discharge module, a fan-shaped basic discharge module and a triangular basic discharge module.

[0007] Furthermore, several basic discharge modules are combined through capacitor sides.

[0008] Furthermore, the shape of the base electrode is adapted to the shape of the capacitor cross section.

[0009] Furthermore, in the fan-shaped basic discharge module, the first electrode is arranged at the center of the capacitor surface, and the second electrode is arranged along the fan-shaped contour of the capacitor surface.

[0010] Furthermore, in the square basic discharge module, the first electrode is cross-shaped, the first electrode is arranged at the center of the capacitor surface, and the second electrode is arranged along the square outline of the capacitor surface.

[0011] Furthermore, in the triangular basic discharge module, the first electrode is arranged at the center of one side of the capacitor surface, and the second electrode is arranged along the triangular outline of the capacitor surface.

[0012] Furthermore, the cross-sections of the several combined basic discharge modules also include semicircular, circular, square, arched, parallelogram and V-shaped;

[0013] When the cross section is semicircular, the mining device is a combination of two fan-shaped basic discharge modules;

[0014] When the cross section is circular, the mining device is a combination of four fan-shaped basic discharge modules;

[0015] When the cross section is circular, the mining device is a combination of four fan-shaped basic discharge modules;

[0016] When the cross section is square, the mining device is a combination of one or more square basic discharge modules;

[0017] When the cross section is arched, the mining device is a combination of two fan-shaped basic discharge modules and several square basic discharge modules;

[0018] When the cross section is a parallelogram, the mining device is a combination of two triangular basic discharge modules;

[0019] When the cross section is V-shaped, the mining device is a combination of several triangular basic discharge modules.

[0020] Furthermore, several combined basic discharge modules may be combined into a step shape, and the surfaces of the several basic discharge modules are not coplanar.

[0021] The present invention also provides a method for mining irregular-shaped areas of ore and rock based on a combined discharge module, which is implemented based on any of the above-mentioned devices for mining irregular-shaped areas of ore and rock based on a combined discharge module, and includes the following steps:

[0022] Determine the shape of the irregular shaped area of ​​ore and rock to be mined, and combine several basic discharge modules into a mining device that is adapted to the shape of the irregular shaped area of ​​ore and rock according to the shape of the irregular shaped area of ​​ore and rock;

[0023] Passing electricity to the first electrode of the capacitor, at this time the first electrode is a positive electrode and the second electrode is a negative electrode;

[0024] The mining device is placed above the rock mass to be crushed in the irregularly shaped area of ​​the ore rock, so that the first electrode and the second electrode are in contact with the surface of the rock mass to be crushed, and a flowing insulating liquid is placed around the mining device;

[0025] The capacitor charges the first electrode, and the potential difference between the first electrode and the second electrode gradually increases until a breakdown voltage is reached;

[0026] A plasma channel is formed in the rock mass to be crushed. The plasma channel expands and does work, causing the rock mass to be crushed to break into rock fragments. The rock fragments are discharged along with the flowing insulating liquid, and the rock fragments are peeled off to form a void space.

[0027] Continuing to discharge, a new plasma channel is formed in the rock mass to be crushed, and the above steps are repeated. After the surfaces of the rock mass to be crushed contacted by the first electrode and the second electrode are both broken, the mining device is sunk;

[0028] The first electrode and the second electrode contact the surface of the new rock mass to be crushed, and the above steps are repeated until all the rock mass to be crushed is crushed and the mining is completed.

[0029] Furthermore, when the void is formed, the insulating liquid is injected into the void; the insulating liquid sinks with the mining device; the rock fragments are extracted along with the insulating liquid, and the insulating liquid with the rock fragments is injected into the electrode operation site after solid-liquid separation.

[0030] Compared with the prior art, the present invention has the following advantages:

[0031] Combining the basic discharge module forms listed in the present invention can meet the needs of most mineral and rock mining operations for special-shaped working areas;

[0032] According to the basic electrode shape and basic discharge module shape listed in the present invention, it is easy to design basic electrodes and basic discharge modules of other shapes by reference to meet the needs of more personalized special-shaped working areas;

[0033] Because the present invention can produce more shapes and larger areas of special-shaped working areas, it provides the necessary foundation for the emergence of new mining methods and mining methods. For different geological environments and rock properties, the design and construction of mining methods are no longer limited to circular or square regular working areas, which can better achieve safe and efficient mining.

[0034] Compared with explosive crushing, the present invention is safer during mining and has more precise control over the shape of the working area; compared with shield cutting and crushing, the equipment of the present invention is smaller in size, lower in cost, can produce a wider range of working area shapes and cross-sectional sizes, and is more efficient for hard rock mining. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0036] Figure 1 This is a schematic diagram of the fan-shaped basic discharge module of the present invention;

[0037] Figure 2 This is a schematic diagram of a square basic discharge module of the present invention;

[0038] Figure 3 This is a schematic diagram of a triangle-based discharge module of the present invention;

[0039] Figure 4 The semicircular working area combined capacitor electrode is composed of basic discharge modules of the present invention;

[0040] Figure 5 The circular working area combined capacitor electrode is composed of basic discharge modules of the present invention;

[0041] Figure 6 The present invention is a square working area combined capacitor electrode composed of basic discharge modules;

[0042] Figure 7 The present invention is an arched working area combined capacitor electrode composed of basic discharge modules;

[0043] Figure 8 The present invention is a parallelogram-shaped working area combined capacitor electrode composed of basic discharge modules;

[0044] Figure 9 The present invention is a V-shaped working area combined capacitor electrode composed of basic discharge modules;

[0045] Figure 10 The present invention is a step-shaped working area combined capacitor electrode composed of basic discharge modules.

[0046] Figure 11 This is a schematic diagram of the first rock breaking process of the present invention.

[0047] Figure 12 This is a schematic diagram of the second rock breaking process of the present invention.

[0048] In the figure: 1, capacitor; 2, first electrode; 3, second electrode; 4, rock mass to be crushed; 5, insulating fluid; 6, insulating fluid flow direction; 7, rock fragments; 8, empty space. DETAILED DESCRIPTION

[0049] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0050] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0051] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0052] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​described in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to ordinary technicians in the relevant fields may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0053] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0054] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0055] The present invention provides a mining device for irregularly shaped mineral rock areas based on a combined discharge module, comprising: a plurality of combined basic discharge modules, each comprising a capacitor 1 and basic electrodes connected to the positive and negative poles of the capacitor 1; the basic electrodes comprising a first electrode 2 and a second electrode 3; when the first electrode 2 is a positive electrode, the second electrode 3 is a negative electrode; when the first electrode 2 is a negative electrode, the second electrode 3 is a positive electrode; the basic discharge modules comprise a square basic discharge module, a semicircular basic discharge module, a fan-shaped basic discharge module, and a triangular basic discharge module. The plurality of basic discharge modules are combined through the side surfaces of the capacitor 1, and the shape of the basic electrodes matches the cross-sectional shape of the capacitor 1.

[0056] In the fan-shaped basic discharge module, the first electrode 2 is arranged at the center of the surface of the capacitor 1, and the second electrode 3 is arranged along the fan-shaped outline of the surface of the capacitor 1. In the square basic discharge module, the first electrode 2 is a cross-shaped one, the first electrode 2 is arranged at the center of the surface of the capacitor 1, and the second electrode 3 is arranged along the square outline of the surface of the capacitor 1. In the triangle basic discharge module, the first electrode 2 is arranged at the center of the surface of the capacitor 1, and the second electrode 3 is arranged along the triangular outline of the surface of the capacitor 1. Figure 1 As shown, the fan-shaped capacitor electrode integrated basic discharge module consists of a fan-shaped body capacitor and a discharge electrode arranged in a fan-shaped outline. Generally, the central electrode is the positive electrode, and the negative electrode is arranged on the periphery of the outline. When using the present invention for excavation, the energy storage capacitor undergoes a continuous charging and discharging process. Each time the capacitor discharges, a plasma channel is formed in the rock between the two positive and negative electrode pairs, achieving the effect of rock destruction. Similarly, Figure 2 The square capacitor electrode integrated basic discharge module consists of a rectangular capacitor and a discharge electrode arranged in a square outline. Figure 3 The integrated basic discharge module of the medium triangle capacitor electrode consists of a triangular prism capacitor and a discharge electrode arranged in a triangular outline.

[0057] The cross-sections of the several combined basic discharge modules also include semicircular, circular, square, arched, parallelogram and V-shaped; when the cross-section is semicircular, the mining device is a combination of two fan-shaped basic discharge modules; when the cross-section is circular, the mining device is a combination of four fan-shaped basic discharge modules; when the cross-section is circular, the mining device is a combination of four fan-shaped basic discharge modules; when the cross-section is square, the mining device is a combination of one or more square basic discharge modules; when the cross-section is arched, the mining device is a combination of two fan-shaped basic discharge modules and several square basic discharge modules; when the cross-section is a parallelogram, the mining device is a combination of two triangular basic discharge modules; when the cross-section is V-shaped, the mining device is a combination of several triangular basic discharge modules. Figure 4 In the process, two identical 90° sector-shaped capacitor electrode integrated basic discharge modules are combined into a semicircular working area combined capacitor electrode. Different positive and negative electrode pairs discharge in sequence according to the degree of ease of discharge between them. After all electrodes have completed one discharge, a semicircular working surface is formed. After the rock fragments formed by this round of discharge are recovered, the electrode moves forward and contacts or approaches the rock to be broken, starting a new round of discharge. As the number of discharges increases, the excavation depth gradually increases, forming a semi-cylindrical working area. Similarly, Figure 5 In the process, four identical 90° sector-shaped capacitor electrode integrated basic discharge modules are combined into a circular working area combined capacitor electrode. After all electrodes complete a discharge in sequence, a circular working surface is formed. After several rounds of discharge, a cylindrical working area is formed. Figure 6In the process, four identical square capacitor electrode integrated basic discharge modules are combined into a larger square working area combined capacitor electrode. After all electrodes complete a discharge in turn, a new square working area is formed. After several rounds of discharge, a rectangular working area is formed. Figure 7 In the figure, two identical 90-degree sector-shaped capacitor electrode integrated basic discharge modules and two identical square capacitor electrode integrated basic discharge modules can be combined into an arched working area combined capacitor electrode as shown in the figure. After all electrodes complete a discharge in sequence, an arched working surface is formed. After several rounds of discharge, an arched hole-shaped working area is formed. Figure 8 In the figure, two identical triangular capacitor electrode integrated basic discharge modules can be combined into a parallelogram working area combined capacitor electrode. After all electrodes complete a discharge in sequence, a parallelogram working surface is formed. After several rounds of discharge, a prismatic working area is formed. Figure 9 In the figure, four identical triangular capacitor electrode integrated basic discharge modules can be combined into a V-shaped working area combined capacitor electrode. After all electrodes complete a discharge in sequence, a parallelogram working surface is formed. After several rounds of discharge, the desired special-shaped working area is formed.

[0058] Several combined basic discharge modules can be combined into a step shape, and the surfaces of the several basic discharge modules are not coplanar. Figure 10 In the diagram, three square capacitor electrode integrated basic discharge modules are combined as shown. The electrodes of each basic discharge module are not coplanar but have a certain height difference, forming a stepped combined capacitor electrode. Because each basic discharge module will only damage the rocks in contact with or near the discharge electrode when it is discharged and mined, it is used Figure 10 When the electrodes are combined in this way, the tunnel can be kept moving forward in a step-like manner to form the desired step-shaped special-shaped working area. Figure 10 The basic discharge modules can be combined to form three-dimensional special-shaped working areas of different depths (elevations).

[0059] like Figure 11-12 As shown, the present invention also provides a method for mining irregular-shaped areas of ore and rock based on a combined discharge module, and a device for mining irregular-shaped areas of ore and rock based on a combined discharge module, comprising the following steps:

[0060] Determine the shape of the irregular shaped area of ​​ore and rock to be mined, and combine several basic discharge modules into a mining device that is adapted to the shape of the irregular shaped area of ​​ore and rock according to the shape of the irregular shaped area of ​​ore and rock;

[0061] The capacitor 1 is energized to the first electrode 2. At this time, the first electrode 2 is a positive electrode and the second electrode 3 is a negative electrode.

[0062] The mining device is placed above the rock mass 4 to be crushed in the irregularly shaped area of ​​the ore rock, so that the first electrode 2 and the second electrode 3 are in contact with the surface of the rock mass 4 to be crushed, and a flowing insulating liquid 5 is placed around the mining device;

[0063] The capacitor 1 charges the first electrode 2, and the potential difference between the first electrode 2 and the second electrode 3 gradually increases until it reaches the breakdown voltage;

[0064] A plasma channel is formed in the rock mass 4 to be crushed. The plasma channel expands and does work, causing the rock mass 4 to be crushed to break into rock fragments 6. The rock fragments 6 are discharged along with the flowing insulating liquid 5. After the rock fragments 6 are peeled off, a void 7 is formed.

[0065] The discharge is continued to form a new plasma channel in the rock mass 4 to be crushed, and the above steps are repeated. After the surfaces of the rock mass 4 to be crushed contacted by the first electrode 2 and the second electrode 3 are both broken, the mining device is sunk. When the void 7 is formed, the insulating liquid 5 is injected into the void 7. The insulating liquid 5 sinks with the mining device. The rock fragments 6 are extracted along with the insulating liquid 5, and the insulating liquid 5 with the rock fragments 6 is injected into the electrode operation after solid-liquid separation.

[0066] The first electrode 2 and the second electrode 3 contact the surface of the new rock mass 4 to be crushed, and the above steps are repeated until all the rock mass 4 to be crushed is crushed and the mining is completed.

[0067] The present invention is based on high-voltage pulse discharge rock-breaking technology, and designs integrated basic discharge modules of capacitor electrodes with different cross-sectional shapes. By combining different basic discharge modules, various special-shaped working areas can be generated, such as arched working areas, semicircular working areas, parallelogram working areas, "V"-shaped working areas, etc. By controlling the different shapes and quantities of basic electrodes, excavation working areas of any shape and size can be generated. The present invention provides a new technical means for ore and rock mining, especially for ore and rock mining under special-shaped working areas. The present invention is safe, reliable, green and efficient. It can be applied to many scenarios such as mining of thin ore veins with large morphological changes and narrow working areas, excavation of tunnels and roadways of different shapes, excavation of special-shaped working areas, etc.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A mining device for special-shaped areas of ore and rock based on a combined discharge module, characterized in that: include: A plurality of combined basic discharge modules, the basic discharge modules comprising a capacitor (1) and basic electrodes connected to the positive and negative electrodes of the capacitor (1), the basic electrodes comprising a first electrode (2) and a second electrode (3), when the first electrode (2) is a positive electrode, the second electrode (3) is a negative electrode; when the first electrode (2) is a negative electrode, the second electrode (3) is a positive electrode, the basic discharge modules comprising a square basic discharge module, a semicircular basic discharge module, a fan-shaped basic discharge module and a triangular basic discharge module; In the fan-shaped basic discharge module, the first electrode (2) is arranged at the center of the surface of the capacitor (1), and the second electrode (3) is arranged along the fan-shaped contour of the surface of the capacitor (1); In the square basic discharge module, the first electrode (2) is cross-shaped, the first electrode (2) is arranged at the center of the surface of the capacitor (1), and the second electrode (3) is arranged along the square outline of the surface of the capacitor (1); In the triangular basic discharge module, the first electrode (2) is arranged at the center of one side of the surface of the capacitor (1), and the second electrode (3) is arranged along the triangular outline of the surface of the capacitor (1); Several basic discharge modules are combined through the side of the capacitor (1), the shape of the basic electrode is adapted to the shape of the cross section of the capacitor (1), the several combined basic discharge modules can be combined into a step shape, and the surfaces of the several basic discharge modules are not coplanar; The cross-sections of the several combined basic discharge modules also include semicircular, circular, square, arched, parallelogram and V-shaped; When the cross section is semicircular, the mining device is a combination of two fan-shaped basic discharge modules; When the cross section is circular, the mining device is a combination of four fan-shaped basic discharge modules; When the cross section is square, the mining device is a combination of one or more square basic discharge modules; When the cross section is arched, the mining device is a combination of two fan-shaped basic discharge modules and several square basic discharge modules; When the cross section is a parallelogram, the mining device is a combination of two triangular basic discharge modules; When the cross section is V-shaped, the mining device is a combination of several triangular basic discharge modules; Several combined basic discharge modules form three-dimensional special-shaped working areas of different depths.

2. A method for mining irregular-shaped areas of ore and rock based on a combined discharge module, implemented based on the mining device for mining irregular-shaped areas of ore and rock based on a combined discharge module according to claim 1, characterized in that: The steps include: Determine the shape of the irregular shaped area of ​​ore and rock to be mined, and combine several basic discharge modules into a mining device that is adapted to the shape of the irregular shaped area of ​​ore and rock according to the shape of the irregular shaped area of ​​ore and rock; The capacitor (1) is energized to the first electrode (2), whereby the first electrode (2) is a positive electrode and the second electrode (3) is a negative electrode; The mining device is arranged above the rock mass (4) to be crushed in the irregularly shaped area of ​​the ore rock, so that the first electrode (2) and the second electrode (3) are in contact with the surface of the rock mass (4) to be crushed, and a flowing insulating liquid (5) is arranged around the mining device; The capacitor (1) is charged to the first electrode (2), and the potential difference between the first electrode (2) and the second electrode (3) is gradually increased to reach a breakdown voltage; A plasma channel is formed in the rock mass to be crushed (4), and the plasma channel expands and performs work, causing the rock mass to be crushed (4) to break into rock fragments (6). The rock fragments (6) are discharged along with the flowing insulating liquid (5), and the rock fragments (6) are peeled off to form a void (7); The discharge is continued to form a new plasma channel in the rock mass (4) to be crushed, and the above steps are repeated. After the surfaces of the rock mass (4) to be crushed contacted by the first electrode (2) and the second electrode (3) are both broken, the mining device is sunk; The first electrode (2) and the second electrode (3) contact the surface of a new rock mass (4) to be crushed, and the above steps are repeated until all the rock mass (4) to be crushed is crushed and mining is completed.

3. The mining method for special-shaped rock areas based on the combined discharge module according to claim 2 is characterized in that: When the empty area (7) is formed, the insulating liquid (5) is injected into the empty area (7); the insulating liquid (5) sinks along with the mining device; the rock fragments (6) are extracted along with the insulating liquid (5), and the insulating liquid (5) with the rock fragments (6) is injected into the electrode operation area after solid-liquid separation.

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