A high-voltage electric pulse drill bit and rock breaking experimental device

Abstract

This invention provides a high-voltage electric pulse drill bit and a rock-breaking experimental device. The high-voltage electric pulse drill bit is positioned directly above the rock. It includes several negative electrodes, a fixing sleeve for securing the negative electrodes, a positive electrode, an insulating sleeve, a spring, an insulating handle, and a cable. The positive electrode is divided into an upper part and a lower part, which are threadedly connected. The rock-breaking experimental device includes a servo electric cylinder, a control component, the high-voltage electric pulse drill bit, a high-voltage pulse power supply, a material container assembly, an aluminum profile support, and an aluminum base. It is used to break rocks. The beneficial effects of this invention are: high rock-breaking drilling efficiency and high wellbore quality; when encountering irregular rocks, the extension and retraction of the positive electrode can make the electrode contact the rock more tightly, resulting in more effective rock breaking; reduced noise and vibration, less drill bit wear, and low energy consumption.

Description

Technical Field

[0001] The invention relates to the field of rock engineering, and in particular to a high-voltage electric pulse drill bit and a rock breaking experimental device. Background Art

[0002] The 21st century is the century of developing and utilizing underground space. The construction of super underground projects cannot be separated from super equipment and needs to rely on the high-quality development of the equipment manufacturing industry. The International Energy Agency predicts that by 2030, nearly 50% of crude oil and natural gas production will be produced by deep wells, ultra-deep wells, new areas such as deep sea and polar regions, and unconventional wells such as oil sands. The drilling depth of exploration and development of oil, natural gas, geothermal wells, etc. is constantly increasing. Traditional mechanical drilling tools have the disadvantages of low drilling efficiency, high drilling costs, and large drill bit wear when drilling deep holes, ultra-deep holes and hard rocks. When the drilling depth exceeds 5000m, the cost of traditional rotary drilling will increase exponentially, while the drilling cost of Electro-Pulse-Boring (EPB) is not limited by the drilling depth.

[0003] Plasma rock breaking can be divided into liquid-electric rock breaking and electric pulse breaking. The electrode does not contact the rock, and the discharge channel occurs directly in the liquid medium. The shock wave or water jet generated by the discharge is used to break the rock. This effect is called liquid-electric rock breaking; the discharge plasma mainly occurs inside the rock, and the power of rock breaking comes from the stress generated when the plasma channel expands. This crushing method is called electric crushing, that is, electric pulse rock breaking. The working principle of electric pulse rock breaking is: applying a high-voltage short pulse (rising edge <500ns), the rock is electrically broken; a small discharge leader is formed inside the rock, and the voltage drop on the electrode is small; when the leader develops to the counter electrode, a plasma channel is formed; the voltage on the high-voltage electrode drops rapidly, and the loop current increases rapidly; the plasma channel expands due to heat, doing work on the surrounding rock, and when the stress exceeds the strength of the rock, the rock is broken. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a high-voltage electric pulse drill bit and a rock breaking experimental device with high rock breaking efficiency and high well wall quality, which are used to realize the electric pulse crushing drilling of rocks. Pulse discharge technology is an electrophysical technology that "slowly" stores energy at a low power level for a long time, and then releases it to the load at a very high power in a short time. When the breakdown voltage rise time is less than 500ns, the breakdown field strength of the rock is less than the breakdown field strength of water, and the rock can be directly broken. The electrode contacts the rock, and when breaking, a discharge channel is formed inside the rock, which directly breaks the rock, has high rock breaking efficiency, and can achieve full crushing. Through the study of drill bit electrodes, insulating materials, drilling parameters and rock crushing mechanisms of multi-physical fields, it has the characteristics of simple operation and high reliability. Electric pulse rock breaking drilling is also called EPB (Electro-Pulse-Boring), which can be used in tunnel drilling, mining, oil and gas drilling, geothermal development, circular economy and other engineering fields.

[0005] A high-voltage electric pulse drill bit is located directly above the rock; it comprises a negative electrode, a fixed negative electrode sleeve for fixing the negative electrode, a positive electrode, an insulating sleeve, a spring, an insulating handle and a cable; the positive electrode is divided into a positive electrode upper half and a positive electrode lower half, and the positive electrode upper half and the positive electrode lower half are threadedly connected;

[0006] An inverted T-shaped insulating sleeve is provided outside the upper half of the positive electrode, a spring is provided outside the insulating sleeve, and the insulating sleeve is used to isolate the upper half of the positive electrode from the spring;

[0007] The top of the insulating sleeve is embedded in the insulating handle, and a positive electrode upper part connecting cable nut is installed on the top of the insulating sleeve, and the positive electrode connecting cable nut is used to connect the positive electrode upper part with the cable;

[0008] The top end of the spring is connected to the bottom end of the hollow wall of the insulating handle, and the bottom end of the spring is connected to a fixed negative electrode sleeve, which is sleeved on the outside of the insulating sleeve and can move relative to the axial direction of the insulating sleeve; the lower half of the positive electrode is located below the insulating sleeve and is threadedly connected to the upper half of the positive electrode; a number of negative electrodes are fixed to the fixed negative electrode sleeve by M4 screws, so that a number of negative electrodes are arranged around the lower half of the positive electrode, wherein a negative electrode is provided with a negative electrode connecting cable bolt, and the negative electrode connecting cable bolt is used to connect the negative electrode to the cable so as to continuously discharge and crush rocks.

[0009] Furthermore, the insulating handle is a hollow T-shaped device, and its material is polytetrafluoroethylene.

[0010] Furthermore, a plurality of negative electrodes are arranged at equal intervals around the lower half of the positive electrode, and the bolts welded on one of the negative electrodes are M6 bolts.

[0011] Furthermore, the insulating sleeve is made of polytetrafluoroethylene material.

[0012] Furthermore, the center distance between the lower half of the positive electrode and the negative electrode is 25mm; an M8 threaded hole is provided at the top of the lower half of the positive electrode for threaded connection with the upper half of the positive electrode, and a 5mm through hole is provided in the middle portion of the lower half of the positive electrode for passing liquid insulating medium to achieve the purpose of circulating slag discharge.

[0013] A rock breaking experimental device, comprising: a servo electric cylinder, a control component, a high-voltage electric pulse drill bit, a high-voltage pulse power supply, a material container component, an aluminum profile bracket and an aluminum base;

[0014] The aluminum base is provided with a material container assembly and an aluminum profile bracket;

[0015] A servo electric cylinder and a control component are arranged on the aluminum profile bracket; a servo motor and a screw are arranged in the servo electric cylinder, the servo motor is connected to the screw, and the bottom end of the screw is connected to the high-voltage electric pulse drill bit; the servo electric cylinder is used to lift and lower the high-voltage electric pulse drill bit, and the control component is used to control the start and stop of the servo electric cylinder;

[0016] The material container assembly comprises a hollow inverted T-shaped material container fixed on an aluminum base by a nut, wherein the material container is used to place a certain rock, and the certain rock is located directly below the high-voltage electric pulse drill bit;

[0017] The high-voltage pulse power supply is respectively connected to the upper half of the positive electrode and the negative electrode through two cables to supply power to the high-voltage electric pulse drill bit;

[0018] The control component starts the servo electric cylinder to work, and then the servo motor rotates. The rotation of the servo motor drives the screw to push the high-voltage electric pulse drill bit downward; when the pressure of the high-voltage electric pulse drill bit in contact with the rock reaches a preset pressure value, the servo motor and the screw stop working, and the high-voltage electric pulse drill bit stops lowering. At this time, the spring is compressed; when encountering irregular rocks or broken rocks, the screw continues to push the high-voltage electric pulse drill bit, and the spring continues to be compressed. The screw pushes the positive electrode to continue to press down until it stops after it is completely in contact with the rock; when the drilling work is completed and the upward movement is completed, the positive electrode and the insulating handle are restored to their initial positions by the elastic force of the spring;

[0019] After a rock is broken, when the pressure between the high-voltage electric pulse drill bit and the rock is less than the preset pressure value, the servo motor starts working again, driving the screw rod to push the high-voltage electric pulse drill bit downward until the rock is completely broken.

[0020] Furthermore, the top of the insulating handle is a flange interface, and 4*7mm through holes are evenly distributed around it, so that the high-voltage electric pulse drill bit is tightly connected to the servo electric cylinder.

[0021] Furthermore, the control component includes a two-way switch and an emergency stop switch button, the two-way switch is used to realize the switching between manual control mode and automatic control mode, and the emergency stop switch button is used to control the emergency stop of the servo electric cylinder; the manual control mode refers to manual control of the servo electric cylinder, and the automatic control mode adopts the speed control mode to control the servo electric cylinder.

[0022] Furthermore, the high-voltage pulse power supply has a multi-channel electric spark switch, which can output multi-channel high-voltage pulses, which are transmitted to the positive and negative electrode pairs in the high-voltage electric pulse drill bit through cables to achieve simultaneous multiple high-voltage pulse discharges.

[0023] The beneficial effects brought by the technical solution provided by the present invention are:

[0024] (1) High rock crushing drilling efficiency and high wellbore quality;

[0025] (2) The high-voltage electric pulse drill bit adopts a spring-retractable mode. When encountering irregular rocks, the positive electrode can be adjusted to make the electrode contact with the rock more closely, thereby breaking the rock more effectively.

[0026] (3) The rock crushing process can be controlled by adjusting the discharge energy with low energy consumption;

[0027] (4) Compared with traditional drilling methods, electric pulse drilling has low noise and vibration levels, is non-mechanical drilling, and has less drill bit wear;

[0028] (5) Conduct experimental analysis on the factors affecting the drilling of rocks using high-voltage electric pulses. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0030] Figure 1 It is an axonometric structural diagram of a high-voltage electric pulse drill bit and a rock breaking experimental device in an embodiment of the present invention;

[0031] Figure 2 1 is an external structural diagram of a high-voltage electric pulse drill bit according to an embodiment of the present invention;

[0032] Figure 3 is a diagram showing the internal structure of a high-voltage electric pulse drill bit in an embodiment of the present invention;

[0033] Figure 4 1 is an equivalent circuit diagram of a high voltage pulse power supply in an embodiment of the present invention.

[0034] In the above figure: 1-servo electric cylinder, 2-high voltage electric pulse drill bit, 2.1-insulating handle, 2.2-spring, 2.3-negative electrode, 2.4-M4 screw for fixing the negative electrode, 2.5-negative electrode connecting cable bolt, 2.6-positive electrode connecting cable nut, 2.7-insulating sleeve, 2.8-lower part of positive electrode, 2.9-fixed negative electrode sleeve, 2.10-upper part of positive electrode, 3-certain rock, 4-material container, 5-aluminum base, 6-fixing bolt, 7-control component, 8-aluminum profile bracket. DETAILED DESCRIPTION

[0035] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0036] The embodiments of the present invention provide a high-voltage electric pulse drill bit and a rock breaking experimental device.

[0037] Please refer to Figures 1 to 4 , Figure 1 This is an axonometric structural diagram of a high-voltage electric pulse drill and a rock-breaking experimental device according to an embodiment of the present invention. Figure 2 This is an external structural diagram of a high-voltage electric pulse drill bit according to an embodiment of the present invention. Figure 3 This is a diagram showing the internal structure of a high-voltage electric pulse drill bit according to an embodiment of the present invention. Figure 4 : is an equivalent circuit diagram of a high voltage pulse power supply in an embodiment of the present invention;

[0038] A rock breaking experimental device, comprising: a servo electric cylinder 1, a high-voltage electric pulse drill bit 2, a high-voltage pulse power supply, a material container component 4, an aluminum base 5, a control component 7 and an aluminum profile bracket 8; the servo electric cylinder 1 is used to lift and lower the high-voltage electric pulse drill bit 2;

[0039] The aluminum base 5 is provided with a material container assembly 4 and an aluminum profile bracket 8;

[0040] The servo electric cylinder 1 and the control component 7 are installed on the aluminum profile bracket 8, which is built with aluminum profiles, has a simple structure and can be reused; the servo electric cylinder 1 is provided with a servo motor and a screw rod, the servo motor is connected to the screw rod, and the bottom end of the screw rod is connected to the high-voltage electric pulse drill bit 2; the servo electric cylinder 1 is used to lift and lower the high-voltage electric pulse drill bit 2, and the control component 7 is used to control the start and stop of the servo electric cylinder 1;

[0041] The material container assembly 4 includes a hollow material container fixed on an aluminum base 5 by a nut. The material container is used to place a certain rock 3 and contain an insulating oil medium. The material container is also provided with a fixing bolt 6. When the rock is placed in the material container, the fixing bolt 6 is used to fix the rock in the material container. The certain rock 3 is located directly below the high-voltage electric pulse drill bit 2. The insulating oil medium is immersed in the top of the certain rock 3 to insulate the high and low voltage electrode pairs.

[0042] The high-voltage electric pulse drill bit 2 comprises an insulating handle 2.1, a spring 2.2, a plurality of negative electrodes 2.3, an M4 screw 2.4 for fixing the negative electrode, a bolt 2.5 for connecting the negative electrode to the cable, a nut 2.6 for connecting the positive electrode to the cable, an insulating sleeve 2.7, a lower part 2.8 of the positive electrode, a fixed negative electrode sleeve 2.9 for fixing the negative electrode, and an upper part 2.10 of the positive electrode. An M8 threaded hole is provided at the top of the lower part of the positive electrode for threaded connection with the upper part of the positive electrode. A 5mm through hole is provided in the middle of the lower part of the positive electrode for passing a liquid insulating medium to achieve the purpose of circulating slag removal. In this embodiment, there are 6 negative electrodes 2.3.

[0043] An inverted T-shaped insulating sleeve 2.7 is provided outside the upper part 2.10 of the positive electrode. The insulating sleeve is made of polytetrafluoroethylene. A spring 2.2 is provided outside the insulating sleeve 2.7. The insulating sleeve 2.7 is used to isolate the upper part 2.10 of the positive electrode from the spring 2.2.

[0044] The top of the insulating sleeve 2.7 is embedded in the insulating handle 2.1, and the insulating handle 2.1 is a hollow T-shaped device. The material of the insulating handle 2.1 is polytetrafluoroethylene; and a positive electrode connecting cable nut 2.6 is installed on the top of the insulating sleeve 2.7, and the positive electrode connecting cable nut 2.6 is used to connect the positive electrode upper part 2.10 with the cable;

[0045] The top end of the spring 2.2 is connected to the bottom end of the hollow wall of the insulating handle 2.1, and the bottom end of the spring 2.2 is connected to the fixed negative electrode sleeve 2.9. The fixed negative electrode sleeve 2.9 is sleeved on the outside of the insulating sleeve 2.7 and can move relative to the axial direction of the insulating sleeve 2.7. When not working, the distance between the bottom end of the insulating handle 2.1 and the top end of the fixed negative electrode sleeve 2.9 is equal to the natural length of the spring 2.2; the positive electrode lower part 2.8 is located below the insulating sleeve 2.7 and is connected to the positive electrode upper part 2.10 by threading; through the M4 screw 2.4, A plurality of negative electrodes 2.3 are fixed to the fixed negative electrode sleeve 2.9, so that the plurality of negative electrodes 2.3 are arranged around the lower half 2.8 of the positive electrode at equal intervals, and the center distance between the lower half of the positive electrode and the plurality of negative electrodes 2.3 is 25 mm; the fixed negative electrode sleeve 2.9 can fix the negative electrode 2.3, so that the negative electrodes are surrounded by a ring shape; a negative electrode connecting cable bolt 2.5 is welded on a certain negative electrode, and the negative electrode connecting cable bolt 2.5 is used to connect the certain negative electrode with the cable so as to continuously discharge and crush the rock. In this embodiment, the negative electrode connecting cable bolt 2.5 is an M6 bolt.

[0046] The high-voltage pulse power supply is respectively connected to the upper half of the positive electrode and the negative electrode through two cables to supply power to the high-voltage electric pulse drill bit; Figure 4 It is an equivalent circuit of a high-voltage pulse power supply, which includes an energy storage capacitor, an electric spark switch, a rectifier, etc. The high-voltage pulse power supply provides a high-voltage electric pulse with a voltage rise time of less than 500ns for the high-voltage electric pulse drill. The industrial frequency electricity is boosted to obtain high-voltage alternating current, and the alternating current is rectified by a high-voltage silicon stack rectifier to obtain high-voltage direct current. When the electric spark switch is disconnected, the energy storage capacitor stores the power supply energy; when the electric spark switch is closed, the energy is injected into the high and low voltage electrodes of the high-voltage electric pulse drill through the transmission cable in a very short time, realizing single pulse discharge and rock breaking.

[0047] The high-voltage pulse power supply has a multi-channel electric spark switch, which can output multi-channel high-voltage pulses, which are transmitted to the positive and negative electrode pairs in the high-voltage electric pulse drill bit through cables to achieve simultaneous multiple high-voltage pulse discharges.

[0048] The top of the insulating handle 2.1 is a flange interface, and 4*7mm through holes are evenly distributed around it so that the high-voltage electric pulse drill bit 2 and the servo electric cylinder 1 can be tightly connected.

[0049] The control component 7 includes a two-way switch and an emergency stop switch button. The two-way switch is used to switch between manual control mode and automatic control mode, and the emergency stop switch button is used to control the servo electric cylinder to stop working urgently; the manual control mode refers to manual control of the servo electric cylinder, and the automatic control mode uses a speed control mode to control the servo electric cylinder, and the internal speed is selected through the output switch of the PLC I / O point.

[0050] The control component 7 starts the servo electric cylinder 1 to work, and then the servo motor rotates. The rotation of the servo motor drives the screw to push the high-voltage electric pulse drill bit 2 to move downward; the negative electrode 2.3 on the high-voltage electric pulse drill bit 2 first contacts with a certain rock 3. In order to make the lower part 2.8 of the positive electrode and the negative electrode 2.3 contact with a certain rock 3 more closely, so as to more effectively break a certain rock 3, the screw of the servo electric cylinder 1 continues to push the insulating handle 2.1, the lower part 2.8 of the positive electrode and the upper part 2.10 of the positive electrode to move downward. At this time, the spring 2.2 is compressed. When the lower part 2.8 of the positive electrode presses against a certain rock, the negative electrode 2.3 contacts with the certain rock 3. When the rock 3 reaches a certain torque, when the pressure of the high-voltage electric pulse drill bit 1 in contact with the rock reaches a preset pressure value, the servo motor and the screw stop working, the high-voltage electric pulse drill bit 2 stops lowering, and the lower part 2.8 of the positive electrode stops descending; when encountering irregular rocks or broken rocks, the screw will continue to push the high-voltage electric pulse drill bit 1, at this time, the spring 2.2 continues to be compressed, and the servo motor and the screw continue to push the positive electrode downward until the positive electrode stops after it is completely in contact with the rock; after the drilling work is completed, when it is necessary to go up, the positive electrode and the insulating handle can be restored to the initial position by the elastic force of the spring;

[0051] The high-voltage electric pulse drill bit 2 is a multi-electrode high-voltage electric pulse drill bit. During drilling, a high-voltage pulse power supply is used for power supply. The high-voltage pulse power supply has a multi-channel electric spark switch, which can output a multi-channel high-voltage pulse, which is transmitted to the high- and low-voltage electrode pairs through cables, and outputs a multi-channel high-voltage electric pulse, whose rising edge time is 50ns-500ns. When the high-voltage pulse power supply outputs a high-voltage electric pulse, the cable is connected to the upper part 2.10 of the positive electrode and the negative electrode connecting cable bolt 2.5 respectively, and the multi-channel electric spark switch of the high-voltage pulse power supply is turned on. A high voltage is generated between the lower part 2.8 of the positive electrode and the negative electrode 2.3. Since the breakdown frequency of the rock is less than the ionized water medium under the high-voltage pulse of the high-voltage pulse power supply, the high- and low-voltage electric fields break through the rock, and a plasma discharge channel is generated inside the rock. The energy on the high-voltage pulse power supply is released into the plasma discharge channel, and the channel is heated. The plasma channel expands due to heat and does work on the surrounding rock mass. When the stress exceeds the stress intensity of the rock, the rock is broken. After a certain rock 3 is broken, the pressure value of the high-voltage electric pulse drill bit 2 on the certain rock 3 is less than the preset pressure value, and the servo motor of the servo electric cylinder 1 continues to work, driving the screw rod to continue to push the insulating handle 2.1 and the lower part 2.8 of the positive electrode and the upper part 2.10 of the positive electrode downward. When the lower part 2.8 of the positive electrode presses the rock to a certain torque, it will stop moving downward, and the high-voltage pulse continues to work on the rock to break the rock, and this cycle continues until the certain rock is completely broken. The above method can achieve multi-section rock breaking drilling with high drilling efficiency and high well wall quality. The difference between using a high-voltage electric pulse drill bit 2 to break rocks and mechanical drilling is that during the drilling process, the high-voltage electric pulse drill bit 2 does not rotate or impact the rock but only presses tightly on the rock.

[0052] The beneficial effects of the present invention are:

[0053] (1) Electric pulse rock breaking drilling is adopted, which has high rock breaking drilling efficiency and high wellbore quality;

[0054] (2) The high-voltage electric pulse drill bit adopts a spring-retractable mode. When encountering irregular rocks, the positive electrode can be adjusted to make the electrode contact with the rock more closely, thereby breaking the rock more effectively.

[0055] (3) The rock crushing process can be controlled by adjusting the discharge energy with low energy consumption;

[0056] (4) Compared with traditional drilling methods, electric pulse drilling has low noise and vibration levels, is non-mechanical drilling, and has less drill bit wear;

[0057] (5) Conduct experimental analysis on the factors affecting the drilling of rocks using high-voltage electric pulses.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A rock breaking experimental device, characterized in that: include: Servo electric cylinder, control assembly, high-voltage electric pulse drill bit, high-voltage pulse power supply, material container assembly, aluminum profile bracket and aluminum base; the high-voltage electric pulse drill bit is located directly above the rock, and includes a plurality of negative electrodes, a fixed negative electrode sleeve for fixing the negative electrode, a positive electrode, an insulating sleeve, a spring and an insulating handle and a cable; the positive electrode is divided into a positive electrode upper half and a positive electrode lower half, and the positive electrode upper half and the positive electrode lower half are threadedly connected; An inverted T-shaped insulating sleeve is provided outside the upper half of the positive electrode, and a spring is provided outside the insulating sleeve, and the insulating sleeve is used to isolate the upper half of the positive electrode from the spring; the center distance between the lower half of the positive electrode and the negative electrode is 25mm; an M8 threaded hole is provided at the top of the lower half of the positive electrode for threaded connection with the upper half of the positive electrode, and a 5mm through hole is provided in the middle of the lower half of the positive electrode for passing a liquid insulating medium to achieve the purpose of circulating slag discharge; The top of the insulating sleeve is embedded in the insulating handle, and a positive electrode connecting cable nut is installed on the top of the insulating sleeve, and the positive electrode connecting cable nut is used to connect the upper half of the positive electrode with the cable; The top of the spring is connected to the bottom of the hollow wall of the insulating handle, and the bottom of the spring is connected to a fixed negative electrode sleeve, which is sleeved on the outside of the insulating sleeve and can move relative to the axial direction of the insulating sleeve; the lower half of the positive electrode is located below the insulating sleeve and is threadedly connected to the upper half of the positive electrode; a number of negative electrodes are fixed to the fixed negative electrode sleeve by M4 screws, so that a number of negative electrodes are arranged around the lower half of the positive electrode, wherein a negative electrode is provided with a negative electrode connecting cable bolt, and the negative electrode connecting cable bolt is used to connect the negative electrode to the cable so as to continuously discharge and crush rocks; The aluminum base is provided with a material container assembly and an aluminum profile bracket; A servo electric cylinder and a control component are arranged on the aluminum profile bracket; a servo motor and a screw are arranged in the servo electric cylinder, the servo motor is connected to the screw, and the bottom end of the screw is connected to the high-voltage electric pulse drill bit; the servo electric cylinder is used to lift and lower the high-voltage electric pulse drill bit, and the control component is used to control the start and stop of the servo electric cylinder; The material container assembly comprises a hollow inverted T-shaped material container fixed on an aluminum base by a nut, wherein the material container is used to place a certain rock, and the certain rock is located directly below the high-voltage electric pulse drill bit; The high-voltage pulse power supply is respectively connected to the upper half of the positive electrode and the negative electrode through two cables to supply power to the high-voltage electric pulse drill bit; The control component starts the servo electric cylinder to work, and then the servo motor rotates. The rotation of the servo motor drives the screw to push the high-voltage electric pulse drill bit to move downward; when the pressure of the high-voltage electric pulse drill bit in contact with the rock reaches a preset pressure value, the servo motor and the screw stop working, and the high-voltage electric pulse drill bit stops lowering; at this time, the spring is compressed, and the positive electrode and the insulating handle are restored to the initial position by the elastic force of the spring; After a rock is broken, when the pressure between the high-voltage electric pulse drill bit and the rock is less than the preset pressure value, the servo motor starts to work again, driving the screw rod to push the high-voltage electric pulse drill bit downward until the rock is completely broken; The top of the insulating handle is a flange interface, and 4*7mm through holes are evenly distributed around it, so that the high-voltage electric pulse drill bit is tightly connected to the servo electric cylinder; The control component includes a two-way switch and an emergency stop switch button, the two-way switch is used to switch between manual control mode and automatic control mode, and the emergency stop switch button is used to control the servo electric cylinder to stop working urgently; the manual control mode refers to manually controlling the servo electric cylinder, and the automatic control mode adopts the speed control mode to control the servo electric cylinder; The high-voltage pulse power supply has a multi-channel electric spark switch, which can output multi-channel high-voltage pulses, which are transmitted to the positive and negative electrode pairs in the high-voltage electric pulse drill bit through cables to achieve simultaneous multiple high-voltage pulse discharges.

2. A rock breaking experimental device according to claim 1, characterized in that: The insulating handle is a hollow T-shaped device, and its material is polytetrafluoroethylene.

3. A rock breaking experimental device according to claim 1, characterized in that: A number of negative electrodes are arranged around the lower half of the positive electrode at equal intervals, and a bolt welded on one of the negative electrodes is an M6 bolt.

4. A rock breaking experimental device according to claim 1, characterized in that: The insulating sleeve is made of polytetrafluoroethylene material.

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