An experimental device for breaking a borehole rock sample by high-voltage pulse discharge

Abstract

The utility model relates to the technical field of pulse high -voltage electricity rock breaking, specifically related to a high -voltage pulse discharge broken drilling rock sample experimental device to solve the current high -voltage pulse discharge broken drilling rock sample experiment, electrode positioning is not accurate, energy loss is big and the problem of poor experimental repeatability. The device includes the insulating bakelite mould that is constituted by the upper layer cylinder top board, the middle part partition board, the lower layer cylinder bottom plate, the insulated electrode support and the extension cylinder, the both sides symmetry of lower layer cylinder bottom plate are equipped with the electrode, through with the electrode of special tip, pulse high -voltage electricity is conducted to the electrode tip from input device, and then the insulating bakelite mould whole accurate control electrode tip position is utilized, through the special tip design of electrode and the effect of mould extension along the surface discharge distance, effectively ensure that the discharge energy concentrates to electrode tip, and the mould itself has the hole sealing effect, greatly reduces and avoids the loss of rock breaking energy.

Description

Technical Field

[0001] This utility model relates to the field of pulsed high-voltage electric rock breaking technology, specifically to an experimental device for breaking borehole rock samples by high-voltage pulse discharge. Background Technology

[0002] With the development of interdisciplinary research, various novel rock-breaking technologies have emerged. High-Voltage Pulse Fragmentation (HVPF) utilizes high-voltage electric pulses to penetrate water or the rock itself, generating shock waves that fracture the rock. It is a type of thermal rock-breaking technology. Compared to other novel rock-breaking technologies, HVPF has high potential for industrial application, with advantages including high rock-breaking efficiency, low energy consumption, and minimal pollution. Currently, this technology has been applied in fields such as waste circuit board recycling, ore pre-crushing, oil and gas extraction, and deep drilling engineering. Existing high-power pulsed high-voltage generators typically employ dual-wire outputs of high and low voltage, using bolted electrodes for pulse discharge. However, such devices suffer from the following technical problems during experiments: precise control of the electrode tip position is difficult; surface discharge leads to energy loss; and the rock-breaking effect is highly susceptible to discharge stability. Therefore, further improvements to the experimental device design are needed to enhance electrode positioning accuracy, reduce energy loss, and improve experimental repeatability. Utility Model Content

[0003] This invention provides a high-voltage pulse discharge experimental device for breaking borehole rock samples, in order to solve the problems of inaccurate electrode positioning, large energy loss and poor experimental repeatability in the prior art mentioned above.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A high-voltage pulse discharge experimental device for breaking borehole rock samples includes an upper cylindrical top plate, a middle partition plate fixedly and vertically connected to the bottom of the upper cylindrical top plate, a lower cylindrical bottom plate fixedly and horizontally connected to the bottom of the middle partition plate, electrodes symmetrically penetrating both sides of the lower cylindrical bottom plate, and an extended cylinder fitted between the bottom of the electrodes and the lower cylindrical bottom plate.

[0006] Furthermore, the top of the lower cylindrical base plate is symmetrically and vertically provided with insulating electrode supports, and the top of each insulating electrode support is provided with a slot, and the horizontal section of the electrode is locked in the slot.

[0007] Furthermore, the lower cylindrical base plate has symmetrical mounting holes on one side near the middle partition plate, the mounting holes are arranged through the extended cylinder, and the vertical section of the electrode is arranged through the mounting holes.

[0008] Furthermore, the end of the vertical section of the electrode extending out of the extended cylinder is also provided with a pointed tip.

[0009] This utility model has the following beneficial effects:

[0010] This utility model provides an experimental device for breaking drilled rock samples using high-voltage pulse discharge. It includes an insulated bakelite mold consisting of an upper cylindrical top plate, a middle partition plate, a lower cylindrical bottom plate, an insulated electrode support, and an extended cylindrical section. Electrodes are symmetrically arranged on both sides of the lower cylindrical bottom plate. High-voltage pulses are conducted from the input device to the electrode tips using electrodes with specially pointed tips. The insulated bakelite mold precisely controls the position of the electrode tips. The special tip design of the electrodes and the mold's extension of the surface discharge distance effectively ensure that the discharge energy is concentrated at the electrode tips. Simultaneously, the mold itself acts as a sealing device, greatly reducing and avoiding the loss of rock-breaking energy. This solves the problems of inaccurate electrode positioning, large energy loss, and poor experimental repeatability in current high-voltage pulse discharge experiments for breaking drilled rock samples.

[0011] This invention allows for precise control of electrode position. Through the combination of an insulated bakelite mold and an electrode support, the position and spacing of the electrode tips can be precisely controlled, improving the repeatability and reliability of the experiment. It also reduces energy loss, as the mold's insulation effectively prevents surface discharge, ensuring that discharge energy is concentrated at the electrode tips. Simultaneously, the mold's sealing effect prevents energy loss during rock breaking. Furthermore, the structure is simple and reliable, with an integrated connection design enhancing the mold's stability and durability, and a corrugated surface design contributing to improved insulation performance. It also has a wide range of applications, suitable for drilling rock sample experiments with different hole diameters and depths, offering high flexibility and practicality. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0013] Figure 2 This is a schematic diagram of the electrode structure of this utility model.

[0014] Figure 3 This is a schematic diagram of the insulating electrode support structure of this utility model.

[0015] Figure 4 This is a three-dimensional schematic diagram of the overall structure of this utility model.

[0016] The meanings of the reference numerals in the attached figures are as follows:

[0017] 1. Top plate of upper cylinder; 2. Middle partition plate; 3. Electrode; 4. Insulating electrode support; 5. Bottom plate of lower cylinder; 6. Extended cylinder; 7. Drilled rock sample; 8. Tip; 9. Mounting hole; 10. Slot. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0019] like Figure 1-4 As shown, a high-voltage pulse discharge experimental device for breaking borehole rock samples includes an upper cylindrical top plate 1, a middle partition plate 2 fixedly and vertically connected to the bottom of the upper cylindrical top plate 1, a lower cylindrical bottom plate 5 fixedly and horizontally connected to the bottom of the middle partition plate 2, electrodes 3 symmetrically and penetratingly arranged on both sides of the lower cylindrical bottom plate 5, and an extension cylinder 6 fitted between the bottom of the electrodes 3 and the lower cylindrical bottom plate 5.

[0020] The top of the lower cylindrical base plate 5 is symmetrically and vertically provided with insulating electrode supports 4. Each insulating electrode support 4 has a slot 10 on its top, and the horizontal section of the electrode 3 is locked in the slot 10.

[0021] The bottom cylindrical base plate 5 has symmetrical mounting holes 9 on one side near the middle partition plate 2. The mounting holes 9 penetrate the extended cylinder 6, and the vertical section of the electrode 3 is arranged through the mounting holes 9.

[0022] The end of the vertical section of electrode 3 extending out of the extended cylinder 6 is also provided with a tip 8.

[0023] The lower cylindrical base plate 5 has corrugated upper and side surfaces, is symmetrical, and has drilled holes. The drilled holes penetrate the lower cylindrical base plate 5, and their radius is greater than or equal to twice the diameter of the drilled rock sample 7. The bottom of the middle partition plate 2 is integrally connected to the lower cylindrical base plate 5, has a corrugated surface, and its height is greater than the height of the electrode 3. The upper cylindrical top plate 1 is integrally connected to the top of the middle partition plate 2, has a corrugated surface, and its radius and height are equal to those of the lower cylindrical base plate 5. The top of the extending cylinder 6 is connected to the lower... The cylindrical base plate 5 is integrally connected, with a smooth surface and symmetrical left and right sides. Its radius is slightly smaller than the hole diameter of the drilled rock sample 7, and its height is half the hole depth of the drilled rock sample 7. It is equipped with drill holes, and the position and shape of the drill holes in the horizontal direction are consistent with the drill holes on the lower cylindrical base plate 5. The cylinder 6 extends through the cylinder in the vertical direction. The bottom of the insulating electrode bracket 4 is integrally connected to the lower cylindrical base plate 5, with one on each side symmetrically. The radius of the semi-circular groove 10 at the top is the same as the radius of the main cylinder of the electrode 3, which is used to fix the electrode position.

[0024] In practical use, the present invention first involves fabricating electrode 3, which is made of a metal material with good conductivity. The tip 8 is machined into the intersection of a cone and a cylinder, and the threaded part matches the high-voltage input device. Next, a mold is fabricated. The insulated bakelite mold is machined using a CNC machine tool to ensure precise dimensions of each component and seamless connection at the integrated joint. Then, the mold is installed, water is injected into the borehole of the drilled rock sample 7, and the extended cylinder 6 is inserted into the borehole, ensuring a tight fit between the outer surface and the inner wall of the borehole. The lower surface of the lower cylindrical base plate 5 is tightly fitted to the upper surface of the drilled rock sample 7, and is secured with tape to ensure a tight seal. Finally, the electrodes are installed. 3. After connecting electrode 3 to the pulse high-voltage input device with bolts, insert it into the drill hole of the lower cylindrical base plate 5, so that the horizontal part of electrode 3 is in close contact with the insulating electrode support 4. Adjust the contact between the control electrode tip 8 and the rock and the spacing of electrode 3. Finally, start the pulse high-voltage input device, input pulse high voltage according to the experimental plan, conduct the electric pulse rock breaking experiment, and record the rock breaking effect and related data. This experimental device, through optimization of its structure and usage method, realizes precise control of the position of electrode 3 and efficient utilization of rock breaking energy, providing a reliable basis for experimental research on high-voltage pulse discharge rock breaking technology. Therefore, this device has good practicality.

Claims

1. A high-voltage pulse discharge experimental device for breaking borehole rock samples, characterized in that: The utility model relates to a cylindrical electrode device, including upper layer cylindrical roof (1), the bottom of upper layer cylindrical roof (1) is fixedly connected with middle part partition plate (2) perpendicularly, the bottom of middle part partition plate (2) is fixedly connected with lower layer cylindrical bottom plate (5) horizontally, the both sides of lower layer cylindrical bottom plate (5) are symmetrically provided with electrode (3) and are penetrated, and the bottom of electrode (3) is inlaid with extension cylinder (6) with lower layer cylindrical bottom plate (5) cladding.

2. The experimental device for breaking a borehole rock sample by high-pressure pulse discharge according to claim 1, characterized in that: The top of lower layer cylindrical bottom plate (5) is symmetrically provided with insulated electrode support (4) perpendicularly, the top of insulated electrode support (4) is all provided with clamping groove (10), and the horizontal section of electrode (3) is clamped in clamping groove (10).

3. The experimental device for breaking a drilled rock sample by high-pressure pulse discharge according to claim 2, characterized in that: The side of lower layer cylindrical bottom plate (5) top close to middle part partition plate (2) is symmetrically provided with mounting hole (9), and mounting hole (9) is provided through extension cylinder (6), and the vertical section of electrode (3) is arranged through mounting hole (9).

4. The experimental device for breaking a drilled rock sample by high-pressure pulse discharge according to claim 3, characterized in that: The end of electrode (3) vertical section that extends out of extension cylinder (6) is also provided with sharp end (8).

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