Experimental device for breaking drilled rock sample through high-voltage pulse discharge and use method of experimental device

Abstract

The invention relates to the technical field of pulse high-voltage electric rock breaking, in particular to a high-voltage pulse discharge drilling rock sample breaking experiment device and a use method thereof, and aims to solve the problems of inaccurate electrode positioning, large energy loss and poor experiment repeatability in the current high-voltage pulse discharge drilling rock sample breaking experiment. According to the method, an insulating bakelite mold composed of an upper-layer cylinder top plate, a middle partition plate, a lower-layer cylinder bottom plate, an insulating electrode support and an extending cylinder is adopted, electrodes are symmetrically arranged on the two sides of the lower-layer cylinder bottom plate in a penetrating mode, and pulse high-voltage electricity is conducted to the electrode tips from an input device through the electrodes with the special tips. And the position of the tip of the electrode is integrally and accurately controlled by using the insulating bakelite mold, discharge energy is effectively ensured to be concentrated to the tip of the electrode through the special tip design of the electrode and the action of prolonging the discharge distance along the surface of the mold, and meanwhile, the mold has a hole sealing effect, so that the loss of rock breaking energy is greatly reduced and avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of pulse high-voltage electric rock breaking, and in particular to an experimental device for breaking drilled rock samples using high-voltage pulse discharge and a method for using the device. Background Art

[0002] With the interdisciplinary development of various disciplines, a variety of new rock-breaking technologies have emerged. High-voltage pulse fragmentation (HVPF) utilizes high-voltage electric pulses to penetrate water or rock itself, generating shock waves that fracture the rock. This technology, a type of thermal rock-breaking technology, has great potential for industrial application compared to other new rock-breaking technologies. Its advantages include high rock-breaking efficiency, low energy consumption, and minimal pollution. Currently, this technology has been applied in waste circuit board recycling, ore pre-crushing, oil and gas extraction, and deep drilling projects. Existing high-power pulsed high-voltage electricity generators typically use dual-wire outputs for high and low voltage, with pulsed discharges generated by bolted electrodes. However, these devices present the following technical challenges during experiments: precise control of the electrode tip position is difficult; surface discharge leads to energy loss; and rock-breaking efficiency is highly susceptible to discharge stability. Therefore, further improvements are needed in the design of experimental devices to improve electrode positioning accuracy, reduce energy loss, and enhance experimental reproducibility. Summary of the Invention

[0003] The present invention provides a high-voltage pulse discharge crushing drilled rock sample experimental device and a method for using the same, in order to solve the problems existing in the prior art in the above background, such as inaccurate electrode positioning, large energy loss and poor experimental repeatability.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions: A high-voltage pulse discharge crushing drilled rock sample experimental device comprises an upper cylindrical top plate, the bottom of the upper cylindrical top plate is fixedly and vertically connected to a middle partition plate, the bottom of the middle partition plate is fixedly and horizontally connected to a lower cylindrical bottom plate, electrodes are symmetrically provided on both sides of the lower cylindrical bottom plate, and an extended cylinder is fitted around the bottom of the electrode and the lower cylindrical bottom plate.

[0005] Furthermore, insulating electrode supports are symmetrically and vertically provided on the top of the bottom plate of the lower cylinder, and slots are provided on the tops of the insulating electrode supports, and the horizontal sections of the electrodes are clamped in the slots.

[0006] Furthermore, mounting holes are symmetrically opened on one side of the top of the bottom plate of the lower cylinder close to the middle partition plate, the mounting holes are arranged through the extended cylinder, and the vertical sections of the electrodes are arranged through the mounting holes.

[0007] Furthermore, the end of the vertical section of the electrode extending out of the extended cylinder is also provided with a pointed end.

[0008] A method for using a high-voltage pulse discharge crushing drilled rock sample experimental device comprises the following steps: Step 1. According to the preset experimental plan, an insulating medium is added to the borehole of the drilled rock sample, and the extended cylindrical end of the insulating bakelite mold composed of an upper cylindrical top plate, a middle partition plate, a lower cylindrical bottom plate and an extended cylinder is inserted into the borehole so that its outer surface is tightly fitted with the inner wall of the borehole, and the lower surface of the lower cylindrical bottom plate is tightly fitted with the upper surface of the drilled rock sample. Then, tape is applied to the upper surface of the lower cylindrical bottom plate and the side surface of the drilled rock sample.

[0009] Step 2: After connecting the electrode to the pulse high-voltage power input device through bolts, insert the electrode into the drilled hole of the lower cylindrical bottom plate. The horizontal section of the electrode fits tightly with the insulated electrode holder. The contact amount between the tip of the electrode and the drilled rock sample is controlled by the total height H of the electrode, the diameter D of the electrode, the height h1 of the insulated electrode holder, the height h2 of the lower cylindrical bottom plate, and the depth h3 of the drilled rock sample.

[0010] Step 3. When conducting the electric effect rock breaking experiment, the tip of the electrode directly contacts the drilled rock sample and electrically breaks through the drilled rock sample, obtaining H=D+h1+h2+h3. When conducting the liquid-electric effect rock breaking experiment, the tip of the electrode does not directly contact the drilled rock sample, and generates a shock wave by electrically breaking through the insulating medium to destroy the rock. Then, by increasing the height h1 of the insulating electrode holder and the depth h3 of the drilled rock sample, H≤D+h1+h2+h3 is obtained. The spacing between the electrodes is controlled by the horizontal distance L from the left surface of the insulating electrode holder to the right surface of the middle partition plate, the horizontal distance L1 between the leftmost side of the electrode and the left surface of the insulating electrode holder, and the width L2 of the middle partition plate, and the spacing between the electrodes is 2(L-L1)+L2.

[0011] Step 4: Finally, input pulse high voltage electricity according to the preset experimental plan to conduct an electric pulse rock breaking experiment. After the electric shock is completed, tear off the tape, take out the insulating bakelite mold and electrode, and then replace the drilled rock sample to carry out the next set of experiments.

[0012] The present invention has the following beneficial effects: The present invention provides a high-voltage pulse discharge rock sample crushing experimental device and a method for using the device. The device adopts an insulating bakelite mold consisting of an upper cylindrical top plate, a middle partition plate, a lower cylindrical bottom plate, an insulating electrode bracket and an extended cylinder. Electrodes are symmetrically provided on both sides of the lower cylindrical bottom plate. Pulsed high voltage electricity is transmitted from an input device to the electrode tip by using an electrode with a special tip. The position of the electrode tip is then accurately controlled by the insulating bakelite mold as a whole. The special tip design of the electrode and the effect of the mold extending the discharge distance along the surface effectively ensure that the discharge energy is concentrated on the electrode tip. At the same time, the mold itself has a sealing effect, which greatly reduces and avoids 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 rock sample crushing experiments.

[0013] The present invention can accurately control the electrode position. Through the cooperation of the insulating bakelite mold and the electrode bracket, the position and spacing of the electrode tips can be accurately controlled, thereby improving the repeatability and reliability of the experiment. Energy loss can be reduced. The insulating performance of the mold effectively blocks surface discharge, ensuring that the discharge energy is concentrated on the electrode tip. At the same time, the sealing effect of the mold can avoid rock breaking energy loss. The structure is simple and reliable, the integrated connection design enhances the stability and durability of the mold, and the corrugated surface design helps to improve the insulation performance. At the same time, it has a wide range of applications and is suitable for drilling rock sample experiments with different apertures and depths, with high flexibility and applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure application of the present invention.

[0015] Figure 2 Schematic diagram of the electrode structure in the present invention.

[0016] Figure 3 This is a schematic diagram of the insulated electrode bracket structure in the present invention.

[0017] Figure 4 It is a schematic three-dimensional diagram of the overall structure of the present invention.

[0018] The meanings of the reference numerals are as follows: 1. Top plate of upper cylinder; 2. Middle partition plate; 3. Electrode; 4. Insulated electrode bracket; 5. Bottom plate of lower cylinder; 6. Extended cylinder; 7. Drilled rock sample; 8. Tip; 9. Mounting hole; 10. Slot. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0020] like Figure 1-4As shown, a high-voltage pulse discharge crushing drilled rock sample experimental device includes an upper cylindrical top plate 1, the bottom of the upper cylindrical top plate 1 is fixedly and vertically connected to a middle partition plate 2, the bottom of the middle partition plate 2 is fixedly and horizontally connected to a lower cylindrical bottom plate 5, electrodes 3 are symmetrically provided on both sides of the lower cylindrical bottom plate 5, and an extended cylinder 6 is fitted around the bottom of the electrode 3 and the lower cylindrical bottom plate 5.

[0021] Insulated electrode supports 4 are symmetrically and vertically arranged on the top of the lower cylindrical bottom plate 5 . A slot 10 is provided on the top of each insulated electrode support 4 , and the horizontal section of the electrode 3 is clamped in the slot 10 .

[0022] A mounting hole 9 is symmetrically opened on one side of the top of the lower cylindrical bottom plate 5 close to the middle partition plate 2 . The mounting hole 9 is set through the extended cylinder 6 , and the vertical section of the electrode 3 is arranged through the mounting hole 9 .

[0023] The end of the vertical section of the electrode 3 extending out of the extension cylinder 6 is also provided with a tip 8.

[0024] The upper surface and side of the lower cylindrical bottom plate 5 are corrugated and symmetrical. A drill hole is provided. The drill hole height passes through the lower cylindrical bottom plate 5. The 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 bottom plate 5. The surface is corrugated. The 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. The surface is corrugated. The radius and height are equal to those of the lower cylindrical bottom plate 5. The top of the extended cylinder 6 is connected to the lower cylindrical bottom plate 5. The cylindrical bottom plate 5 is connected in one piece, has a smooth surface, is symmetrical on both sides, has a radius slightly smaller than the diameter of the drilled rock sample 7, and a height half the depth of the drilled rock sample 7. A drill hole is provided, and the horizontal position and shape of the drill hole are consistent with the drill hole on the lower cylindrical bottom plate 5. The height direction passes through the extended cylinder 6. The bottom of the insulated electrode bracket 4 is connected in one piece to the lower cylindrical bottom plate 5, one on each side is symmetrical, and the radius of the semicircular slot 10 on the top is the same as the radius of the main cylinder of the electrode 3, which is used to fix the electrode position.

[0025] The high-voltage pulse discharge crushing drilled rock sample experimental device includes the following steps when used: Step 1: According to the preset experimental plan, an insulating medium such as water or oil is added to the borehole of the drilled rock sample 7. The extended cylinder 6 end of the insulating bakelite mold composed of the upper cylindrical top plate 1, the middle partition plate 2, the lower cylindrical bottom plate 5 and the extended cylinder 6 is inserted into the borehole so that its outer surface is closely fitted with the inner wall of the borehole, and the lower surface of the lower cylindrical bottom plate 5 is closely fitted with the upper surface of the drilled rock sample 7. Then, an adhesive tape is attached to the upper surface of the lower cylindrical bottom plate 5 and the drilled rock sample 7. Step 2: After the electrode 3 is connected to the pulse high voltage power input device through bolts, the electrode 3 is inserted into the drilled hole of the lower cylindrical bottom plate 5. The horizontal section of the electrode 3 is tightly fitted with the insulating electrode holder 4. The contact amount between the tip 8 of the electrode 3 and the drilled rock sample 7 is controlled by the total height H of the electrode 3, the diameter D of the electrode 3, the height h1 of the insulating electrode holder 4, the height h2 of the lower cylindrical bottom plate 5, and the depth h3 of the drilled rock sample 7. Step 3: During the effect rock breaking experiment, the tip 8 of the electrode 3 directly contacts the drilled rock sample 7 and electrically penetrates the drilled rock sample 7, obtaining H=D+h1+h2+h3. During the liquid-electric effect rock breaking experiment, the tip 8 of the electrode 3 does not directly contact the drilled rock sample 7, and generates a shock wave by electrically breaking through the insulating medium to destroy the rock. Then, by increasing the height h1 of the insulating electrode holder 4 and increasing the depth h3 of the drilled rock sample 7, H≤D+h1+h2+h3 is obtained. The spacing of the electrodes 3 is controlled by the horizontal distance L from the left surface of the insulating electrode holder 4 to the right surface of the middle partition plate 2, the horizontal distance L1 between the leftmost side of the electrode 3 and the left surface of the insulating electrode holder 4, and the width L2 of the middle partition plate 2, so that the spacing of the electrodes 3 is 2(L-L1)+L2; Step 4, finally, input pulse high voltage according to the preset experimental plan to carry out the electric pulse rock breaking experiment. After the electric shock is completed, tear off the tape, take out the insulating bakelite mold and the electrode 3, and then replace the drilled rock sample 7 to carry out the next set of experiments.

Claims

1. A high-voltage pulse discharge experimental device for crushing drilled rock samples, characterized by: The invention comprises an upper cylindrical top plate (1), the bottom of the upper cylindrical top plate (1) is fixedly connected vertically to a middle partition plate (2), the bottom of the middle partition plate (2) is fixedly connected horizontally to a lower cylindrical bottom plate (5), electrodes (3) are symmetrically provided on both sides of the lower cylindrical bottom plate (5), and an extension cylinder (6) is fitted between the bottom of the electrode (3) and the lower cylindrical bottom plate (5).

2. The high-voltage pulse discharge crushing drilled rock sample experimental device according to claim 1 is characterized by: Insulated electrode supports (4) are symmetrically and vertically arranged on the top of the lower cylindrical bottom plate (5), and a clamping groove (10) is provided on the top of each of the insulated electrode supports (4), and the horizontal section of the electrode (3) is clamped in the clamping groove (10).

3. The high-voltage pulse discharge crushing drilled rock sample experimental device according to claim 2 is characterized by: A mounting hole (9) is symmetrically provided on one side of the top of the lower cylindrical bottom plate (5) close to the middle partition plate (2), the mounting hole (9) is arranged through the extended cylindrical body (6), and the vertical section of the electrode (3) is arranged through the mounting hole (9).

4. The high-voltage pulse discharge crushing drilled rock sample experimental device according to claim 3 is characterized by: The end of the vertical section of the electrode (3) extending out of the extended cylinder (6) is also provided with a tip (8).

5. Also included is a method for using a high-voltage pulse discharge crushing drilled rock sample experimental device, characterized in that: The following steps are involved: Step 1: According to a preset experimental plan, an insulating medium is added to the borehole of the drilled rock sample (7), and the end of the extended cylinder (6) of the insulating bakelite mold composed of the upper cylindrical top plate (1), the middle partition plate (2), the lower cylindrical bottom plate (5) and the extended cylinder (6) is inserted into the borehole so that the outer surface thereof is closely fitted with the inner wall of the borehole, and the lower surface of the lower cylindrical bottom plate (5) is closely fitted with the upper surface of the drilled rock sample (7), and then an adhesive tape is attached to the upper surface of the lower cylindrical bottom plate (5) and the side surface of the drilled rock sample (7); Step 2: After the electrode (3) is connected to the pulse high voltage power input device through a bolt, the electrode (3) is inserted into the drilled hole of the lower cylindrical bottom plate (5), the horizontal section of the electrode (3) is tightly fitted with the insulating electrode bracket (4), and the contact amount between the tip (8) of the electrode (3) and the drilled rock sample (7) is controlled by the total height H of the electrode (3), the diameter D of the electrode (3), the height h1 of the insulating electrode bracket (4), the height h2 of the lower cylindrical bottom plate (5), and the depth h3 of the drilled rock sample (7); Step 3: When conducting the electric effect rock breaking experiment, the tip (8) of the electrode (3) directly contacts the drilled rock sample (7) and electrically breaks through the drilled rock sample (7), obtaining H=D+h1+h2+h3. When conducting the liquid-electric effect rock breaking experiment, the tip (8) of the electrode (3) does not directly contact the drilled rock sample (7), and generates a shock wave by electrically breaking through the insulating medium to destroy the rock. Then, by increasing the height h1 of the insulating electrode holder (4) and increasing the depth h3 of the drilled rock sample (7), obtaining H≤D+h1+h2+h3. The spacing of the electrodes (3) is controlled by the horizontal distance L from the left surface of the insulating electrode holder (4) to the right surface of the middle partition plate (2), the horizontal distance L1 between the leftmost side of the electrode (3) and the left surface of the insulating electrode holder (4), and the width L2 of the middle partition plate (2), obtaining the spacing of the electrodes (3) as 2(L-L1)+L2. Step 4: Finally, pulse high voltage electricity is input according to the preset experimental plan to conduct an electric pulse rock breaking experiment. After the electric shock is completed, the tape is torn off, the insulating bakelite mold and the electrode (3) are taken out, and the drilled rock sample (7) is replaced to conduct the next set of experiments.

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