Rock Crushing Experimental Device Based on Underwater Pulse Discharge Shock Wave

Abstract

The rock crushing experimental device based on underwater pulse discharge shock wave relates to the field of rock crushing technology and is used to study the influence of different parameters on the hydraulic-electric effect shock wave rock crushing. It includes a water tank, a rock clamping assembly and an electrode rod clamping assembly. The bottom of the water tank is provided with a positioning rod. The rock clamping assembly includes a fixed rod, a locking rod and a clamping unit. The fixed rod is provided with a support plate. The fixed rod is sleeved on the positioning rod. The locking rod is threadedly connected to the upper part of the positioning rod. The clamping unit includes a bottom plate and a clamping plate. The bottom plate is rotatably connected to the support plate, and the clamping plate is fixed to the top of the bottom plate. The top of the water tank is provided with a mounting block. The electrode rod clamping assembly includes a fixed electrode plate and a movable electrode plate. The fixed electrode plate is fixed on the mounting block. The fixed electrode plate has a low-voltage electrode rod. The movable electrode plate is movably arranged with the mounting block. A high-voltage electrode rod is installed on the movable electrode plate. The high and low-voltage electrode rods are connected to a high-voltage power supply. The present invention can study the influence of different parameters on the hydraulic-electric effect rock crushing.

Description

Technical Field

[0001] The invention relates to the technical field of rock crushing, in particular to a rock crushing experimental device based on underwater pulse discharge shock waves. Background Art

[0002] In the field of geotechnical exploration, the traditional method of rock crushing is mainly explosive blasting. The main problems are that the shock wave is difficult to control and the discharge frequency of explosives is low when used once, which restricts the economic benefits and survey speed. The liquid-electric effect uses high-power pulse technology to form a short pulse high voltage between the discharge electrodes. The pulse high voltage breaks through the liquid medium to produce a plasma channel. When the electric energy is injected into the plasma channel, high temperature and high pressure are generated, causing the plasma channel to expand outward to produce a pulse pressure wave (i.e., shock wave). The shock wave pressure generated by the liquid-electric effect can reach up to 10GPa, which can break hard rocks. The characteristics of the shock wave generated by the liquid-electric effect are affected by some factors, such as pulse voltage parameters, distance between electrodes, electrode shape, water medium characteristics, etc. In order to further study the characteristics of underwater discharge rock crushing, it is necessary to study the factors affecting the shock wave. Because the liquid phase pulse discharge experimental environment is very extreme, safety is difficult to guarantee, and it is difficult to adjust parameters in extreme experimental environments. Therefore, it is necessary to provide an experimental system that can adjust the discharge parameters while ensuring the stability of the liquid phase discharge. The liquid phase discharge shock wave rock breaking experimental system disclosed in Chinese patent CN111208021B can adjust the parameters that affect the discharge and is used to conduct experimental research on liquid phase discharge impact rock breaking. The above experimental system has the following defects: (1) It can only quantitatively adjust the straight-line distance between the rock and the discharge electrode; (2) It is impossible to conduct experiments when the rock is in a non-discharge gap position; (3) It is impossible to study the effect of the change in the distance and relative position between the high-voltage electrode and the low-voltage electrode on the energy of the liquid-electric effect shock wave. (4) The rock is surrounded by the main clamping plate, the auxiliary clamping plate and the fixed table, and it is impossible to study the impact of the shock wave on the rock. Summary of the invention

[0003] The purpose of the present invention is to provide a rock crushing experimental device based on underwater pulse discharge shock wave, which is applied to the experimental research of liquid-electric effect, and is used to study the influence of different relative positions between high-voltage electrode and low-voltage electrode, and different relative positions between rock and discharge gap on the liquid-electric effect shock wave rock crushing.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a rock crushing experimental device based on underwater pulse discharge shock waves, comprising a water tank, a rock clamping assembly and an electrode rod clamping assembly, the bottom of the water tank is provided with a positioning rod, the rock clamping assembly is located inside the water tank, the rock clamping assembly comprises a fixing rod, a locking rod and a clamping unit, the fixing rod is a hollow structure and has an adjustable length, a supporting plate is provided on the fixing rod, the fixing rod is sleeved on the positioning rod, the locking rod is threadedly connected to the upper part of the positioning rod and contacts with the top of the fixing rod; the clamping unit comprises a bottom plate and a clamping The bottom plate is rotatably mounted on the top of the supporting plate, the clamping plate has two pieces and is fixed to the top of the bottom plate by bolts, the side wall of the clamping plate has a plug rod, the plug rod is used to extend into the drill hole on the rock, the bottom of the supporting plate has a positioning unit, the positioning unit includes an outer cylinder and a positioning ring, the outer cylinder is fixedly connected to the supporting plate, the positioning ring is movably arranged on the inner side of the outer cylinder and the top of the positioning ring has a positioning tooth, the bottom of the bottom plate has a locking ring, the bottom of the locking ring has a locking tooth, and when the positioning tooth extends between two adjacent locking teeth on the locking ring, the bottom plate and the supporting plate are relatively fixed;

[0005] The water tank has a mounting block on the top, and the electrode rod clamping assembly includes a fixed electrode plate, a transverse slide, a vertical slide and a movable electrode plate. The fixed electrode plate is fixed to the mounting side wall of the mounting block, and a low-voltage electrode rod is fixedly mounted on the fixed electrode plate, and a low-voltage electrode is provided at the lower end of the low-voltage electrode rod; the transverse slide is slidably connected to the mounting side wall of the mounting block in the transverse direction, and the vertical slide is slidably connected to the transverse slide in the vertical direction; the mounting block has a driving unit for driving the transverse slide to move, and the transverse slide has another driving unit for driving the vertical slide to move; the movable electrode plate is fixed to the vertical slide, and a high-voltage electrode rod is fixedly mounted on the movable electrode plate, and a high-voltage electrode is provided at the lower end of the high-voltage electrode rod, and a discharge gap is formed between the high-voltage electrode and the low-voltage electrode, the high-voltage electrode rod has a cable connected to the high-voltage electrode, and the low-voltage electrode rod has another cable connected to the low-voltage electrode, and the two cables are connected to a high-voltage power supply.

[0006] Furthermore, the positioning rod includes a base and a vertical rod, the base is fixedly connected to the bottom of the water tank, the top of the base has a blind hole, the side wall of the upper part of the base has a plurality of slots, the lower end of the vertical rod extends into the blind hole and is fixedly connected to the base; the bottom of the fixing rod has an insert block, and after the insert block is inserted into the slot, the fixing rod and the positioning rod are relatively fixed in a horizontal plane.

[0007] Furthermore, the fixed rod includes an upper rod and a lower rod arranged up and down, and the upper rod and the lower rod are both hollow structures. A connecting tube is fixed to the bottom of the upper rod, and the connecting tube is threadedly connected to the upper part of the lower rod; the support plate is fixed to the outer wall of the upper rod, and the top of the upper rod has a convex ring that contacts the bottom of the locking rod.

[0008] Furthermore, the inner side of the locking rod is a threaded hole, the upper part of the vertical rod has an external thread, and the inner wall of the threaded hole has an internal thread that matches the external thread.

[0009] Furthermore, there are two positioning rods and two fixing rods, and the support plates on the outer walls of the two fixing rods are connected to form a whole.

[0010] Furthermore, the positioning ring is located in the upper end of the outer cylinder, and a piston is provided in the lower end of the outer cylinder. The piston and the positioning ring are fixedly connected by a connecting rod. The inner wall of the outer cylinder has a spring mounting ring, and a spring is provided between the spring mounting ring and the positioning ring. Under the action of the spring, the positioning tooth on the positioning ring extends between two adjacent locking teeth on the locking ring.

[0011] Furthermore, the high-voltage electrode rod and the low-voltage electrode rod each include an acrylic tube located on the outer layer, a cable located in the acrylic tube, and an insulating glue filled between the cable and the acrylic tube. The filling insulating glue can reduce the leakage of the high-voltage electrode rod before the discharge gap is broken down, and can also shield the electromagnetic interference to the precision electronic devices caused by the antenna effect, thereby increasing the test accuracy.

[0012] Furthermore, the driving unit between the transverse slide and the mounting block includes a first handle and a transmission mechanism, and the driving unit between the transverse slide and the vertical slide includes a second handle and another transmission mechanism, and a lead screw is fixed to the output end of the transmission mechanism; the first handle is fixedly connected to the input end of the transmission mechanism, and the second handle is fixedly connected to the input end of the other transmission mechanism, and the side walls of the transverse slide and the vertical slide have a nut that cooperates with the lead screw.

[0013] Furthermore, the high-voltage electrode rod is a linear structure, the lower end of the low-voltage electrode rod has a U-shaped portion, one end of the U-shaped portion is connected to the lower end of the low-voltage electrode rod to form a whole, and the low-voltage electrode is located at the end of the other end of the U-shaped portion.

[0014] The beneficial effects of the present invention are:

[0015] (1) The present invention can adjust the gap size of the discharge gap and realize the offset between the high-voltage electrode and the low-voltage electrode in the horizontal plane, thereby studying the rock crushing effect of different discharge gaps;

[0016] (2) The present invention adjusts the relative position between the rock and the discharge gap by rotating the bottom plate in a horizontal plane, thereby studying the rock crushing effect at different positions between the rock and the discharge gap;

[0017] (3) When adjusting the relative position between the high and low voltage electrodes, it is only necessary to operate the first and second handles, which is easy to operate;

[0018] (4) The rock clamping is convenient and firm, which allows for full study of the crushing effect of shock waves on rocks; the rock clamping assembly and positioning rod are easy to assemble and operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 One of the three-dimensional diagrams of the experimental device of the present invention;

[0020] Figure 2 This is the second three-dimensional diagram of the experimental device of the present invention;

[0021] Figure 3 It is a front view of the experimental device of the present invention;

[0022] Figure 4 Schematic diagram of the internal structure of the water tank;

[0023] Figure 5 for Figure 4 A local view in the direction of A;

[0024] Figure 6 is a side view of the fixing rod;

[0025] Figure 7 is a cross-sectional view of the fixing rod;

[0026] Figure 8 is a front view of the rock clamping assembly;

[0027] Fig. 9 is a top view of the clamping unit;

[0028] Fig.10 is a bottom view of the clamping unit;

[0029] Fig.11 This is the assembly drawing of the fixing rod and the positioning rod;

[0030] Fig.12 is a three-dimensional image of the base plate;

[0031] Fig.13 is a schematic diagram of the internal structure of the positioning unit;

[0032] Fig.14 It is a schematic diagram of the separation of the positioning ring in the positioning unit and the locking ring at the bottom of the base plate;

[0033] Fig.15 It is a rear view of the high voltage electrode rod and the low voltage electrode rod;

[0034] Fig.16 A three-dimensional diagram of the electrode rod clamping assembly;

[0035] Fig.17 One of the three-dimensional diagrams of the lateral slide;

[0036] Fig.18 The second is a three-dimensional diagram of the transverse slide;

[0037] Fig.19 It is a side view assembly drawing of the transverse slide and the transmission mechanism;

[0038] Fig. 20 It is a schematic diagram of the high-voltage electrode rod moving up and down relative to the low-voltage electrode rod;

[0039] Fig.21 It is a schematic diagram of the lateral movement of the high voltage electrode rod relative to the low voltage electrode rod;

[0040] Fig. 22 is a schematic diagram of a clamping unit clamping a rock;

[0041] Fig.23 A schematic diagram of adjusting the relative position between the rock and the discharge gap by rotating the bottom plate relative to the supporting plate;

[0042] Fig.24 This is a positional relationship diagram between the high-voltage electrode rod, the low-voltage electrode rod and the rock;

[0043] In the figure: 1 water tank, 11 cover plate, 12 bar hole, 2 positioning rod, 21 base, 22 slot, 23 vertical rod, 3 fixing rod, 31 lower rod, 32 plug block, 33 connecting tube, 34 upper rod, 35 support plate, 36 convex ring, 4 locking rod, 41 handle, 42 threaded hole, 43 flaring, 5 bottom plate, 51 clamping plate, 52 adjustment hole, 53 bolt, 54 plug rod, 55 locking ring, 551 locking tooth, 56 spring, 57 outer tube, 571 piston, 572 ring groove, 573 connecting rod, 574 spring mounting ring, 58 positioning ring, 581 fixed Position teeth, 6 mounting block, 61 fixed electrode plate, 62 transverse slide groove, 63 round hole, 7 transverse slide seat, 71 slider, 72 vertical slide groove, 73 through hole, 74 vertical slide seat, 75 movable electrode plate, 76 nut, 761 lead screw, 762 driven bevel gear, 763 driving bevel gear, 764 worm gear, 765 worm, 77 first handle, 78 second handle, 8 high-voltage electrode rod, 8' low-voltage electrode rod, 81 retaining ring, 82 cable, 83 nut, 84 high-voltage electrode, 85 low-voltage electrode, 86 U-shaped part, 9 rock, 10 discharge gap. DETAILED DESCRIPTION

[0044] like Figures 1 to 24 As shown, the present invention includes a water tank 1, a rock clamping assembly and an electrode rod clamping assembly. The present invention is described in detail below in conjunction with the accompanying drawings.

[0045] like Figures 1 to 24As shown, the rock crushing experimental device based on underwater pulse discharge shock wave includes a water tank 1, a rock clamping assembly and an electrode rod clamping assembly. The water tank 1 is made of acrylic plate material with good light transmittance, high insulation strength and strong tolerance. An observation window is left on the side of the box, which can be combined with a high-speed ICCD camera to observe the generation of shock waves and the degree of rock crushing. Figure 1 , Figure 2 As shown, the top of the water tank 1 has a square hole, and a cover plate 11 is provided in the square hole for easy opening. The top of the water tank also has a strip hole 12, and water is filled into the water tank 1 when in use. Figure 4 As shown, the bottom of the water tank 1 has a positioning rod 2, and the rock clamping assembly is located inside the water tank 1. Figure 6 As shown, the rock clamping assembly includes a fixing rod 3, a locking rod 4 and a clamping unit. The fixing rod 3 is a hollow structure with an adjustable length. The fixing rod 3 is provided with a support plate 35. Figure 7 As shown, the fixing rod 3 is used to be sleeved on the positioning rod 2, and the locking rod 4 is threadedly connected to the upper part of the positioning rod 2 and contacts the top of the fixing rod 2, thereby fixing the fixing rod 3 and the positioning rod 2 together. The clamping unit includes a base plate 5 and a clamping plate 51. The base plate 5 is rotatably mounted on the top of the support plate 35. The clamping plate 51 has two pieces and is fixed to the top of the base plate 5 by bolts 53. The side wall of the clamping plate 51 has an insertion rod 54. The insertion rod 54 is used to extend into the drilled hole on the rock, and the side wall of the clamping plate 51 contacts the outer wall of the rock, thereby achieving a firm clamping of the rock. Before the experiment, a hole can be pre-drilled in the outer wall of the rock. The clamping plate 51 is an L-shaped structure. The horizontal part of the clamping plate 51 contacts the top of the base plate 5, and the vertical part of the clamping plate 51 is used to clamp the rock. As shown Fig. 9 As shown, a strip-shaped adjustment hole 52 is provided on the horizontal part of the clamping plate 51, and a bolt 53 passes through the adjustment hole 52 and is threadedly connected with the bottom plate 5 to achieve relative fixation between the bottom plate 5 and the clamping plate 51. According to the size of the rock, the relative position between the clamping plates 51 is adjusted so that the clamping plates 51 clamp the rock. Figure 8 As shown, the bottom of the support plate 35 has a positioning unit, such as Fig.13 As shown, the positioning unit includes an outer cylinder 57 and a positioning ring 58. The outer cylinder 57 is fixedly connected to the support plate 35. The positioning ring 58 is movably arranged inside the outer cylinder 57 and the top of the positioning ring 58 has positioning teeth 581 evenly arranged along the circumferential direction. Fig.12 As shown, the bottom of the bottom plate 5 has a locking ring 55, and the bottom of the locking ring 55 has locking teeth 551 evenly arranged along the circumferential direction. When the positioning teeth 581 extend between two adjacent locking teeth 551 on the locking ring 55, the bottom plate 5 and the supporting plate 35 are relatively fixed. The supporting plate 35 is provided with a mounting hole, and the locking ring 55 extends into the mounting hole to realize the rotation connection between the supporting plate 35 and the bottom plate 5.

[0046] like Figure 3As shown, the top of the water tank 1 has a mounting block 6. The electrode rod clamping assembly includes a fixed electrode plate 61, a transverse slide 7, a vertical slide 74 and a movable electrode plate 75. The fixed electrode plate 61 is fixed to the mounting side wall of the mounting block 6. The fixed electrode plate 61 has a circular hole 63. A low-voltage electrode rod 8' is fixedly mounted on the fixed electrode plate 61. The low-voltage electrode rod 8' passes through the circular hole 63. The lower end of the low-voltage electrode rod 8' has a low-voltage electrode 85. The transverse slide 7 is slidably connected to the mounting side wall of the mounting block 6 in the transverse direction. The vertical slide 74 is slidably connected to the transverse slide 7 in the vertical direction. The mounting block 6 has a driving unit for driving the transverse slide 7 to move. The transverse slide 7 has another driving unit for driving the vertical slide 74 to move. The movable electrode plate 76 is fixed to the vertical slide 74. The high-voltage electrode rod 8 is fixedly mounted on the movable electrode plate 75. The high-voltage electrode rod 8 passes through the strip hole 12 and extends downward. The lower end of the high-voltage electrode rod 8 has a high-voltage electrode 84. Fig.15 As shown, a discharge gap 10 is formed between the high-voltage electrode 84 and the low-voltage electrode 85. The high-voltage electrode rod 8 has a cable 82 connected to the high-voltage electrode 84, and the low-voltage electrode rod 8' has another cable 82 connected to the low-voltage electrode 85. The two cables 82 are connected to a high-voltage power supply. The pulse voltage parameters are adjusted by an external circuit to simulate the influence of the pulse voltage parameters on the shock wave lithotripsy characteristics. The voltage and current characteristics of the discharge are obtained through the voltage probe and the current coil. The high-voltage power supply is used to provide pulsed high voltage electricity to the high-voltage electrode, thereby discharging in the discharge gap between the high-voltage electrode 84 and the low-voltage electrode 85, thereby forming a shock wave. As shown in FIG. Fig.24 As shown, after the rock clamping assembly clamps and fixes the rock 9, the rock 9 is located at the front side or the rear side of the discharge gap, and the shock wave acts on the rock 9 to break the rock.

[0047] The base plate 5 and the support plate 35 for clamping and installing the rock of the present invention are rotatably connected, and the locking and fixing between the base plate 5 and the support plate 35 are realized by relying on the positioning unit, so as to adjust the relative position of the rock in the horizontal plane, and fix the rock position after adjustment, so as to study the rock crushing effect when the rock and the discharge gap are in different relative positions. The high-voltage electrode rod 8 and the low-voltage electrode rod 8' are driven by the driving unit to move relative to each other vertically or horizontally, so as to adjust the size of the discharge gap, and adjust the relative position between the high-voltage electrode 84 and the low-voltage electrode 85, so as to study the crushing effect of the rock with different sizes and different orientations of the discharge gap. The rock clamping assembly can firmly clamp the rock, so as to study the crushing effect of the shock wave on the rock. In addition, the rock is installed on the rock clamping assembly outside the water tank 1, which is convenient to operate. The rock clamping assembly and the positioning rod 2 are easy to assemble and firmly assembled, providing a good basic environment for the experiment.

[0048] In order to achieve relative fixation between the positioning rod 2 and the fixing rod 3 along the circumferential direction, as shown in FIG. Figure 4 , Figure 5 As shown, the positioning rod 2 includes a base 21 and a vertical rod 23. The base 21 is fixedly connected to the bottom of the water tank 1. The top of the base 21 has a blind hole. The side wall of the upper part of the base 21 has a plurality of slots 22 evenly arranged along the circumference. The lower end of the vertical rod 23 extends into the blind hole and is fixedly connected to the base 21. The bottom of the fixing rod 3 has an insert block 32 evenly arranged along the circumference. After the insert block 32 extends into the slot 22, the fixing rod 3 and the positioning rod 2 are relatively fixed in the horizontal plane.

[0049] To adjust the length of the fixed rod 3, Figure 6 , Figure 7 As shown, the fixing rod 3 includes an upper rod 34 and a lower rod 31 arranged up and down, and both the upper rod 34 and the lower rod 31 are hollow structures. A connecting tube 33 is fixed to the bottom of the upper rod 34, and the connecting tube 33 is threadedly connected to the upper part of the lower rod 31; when the connecting tube 33 is rotated, the distance between the upper rod 34 and the lower rod 31 can be adjusted, thereby adjusting the length of the fixing rod 3. The supporting plate 35 is fixed to the outer wall of the upper rod 34, and the top of the upper rod 34 has a convex ring 36 that contacts the bottom of the locking rod 4. The outer diameter of the convex ring 36 is larger than the outer diameter of the locking rod 4, thereby ensuring the contact between the fixing rod 3 and the locking rod 4. The inner side of the locking rod 4 is a threaded hole 42, the upper part of the vertical rod 23 has an external thread, and the inner wall of the threaded hole 42 has an internal thread that matches the external thread. The bottom of the locking rod 4 has a flare 43, which is the extension of the threaded hole 42. The setting of the flare 43 facilitates the vertical rod 23 to extend into the threaded hole 42. The top of the locking rod 4 has a handle 41, which is arranged vertically with the locking rod 4. When in use, the locking rod 4 is rotated by holding the handle 41 to achieve assembly and disassembly between the locking rod 4 and the upper rod 34 of the fixing rod 3. Figure 8 As shown, there are two fixing rods 3 and two locking rods 4, and there are two corresponding positioning rods 2, and the supporting plates 35 on the outer walls of the two fixing rods 3 are connected to form a whole.

[0050] like Fig.13 As shown, the positioning ring 58 is located in the upper end of the outer cylinder 57. Fig.10 As shown, the lower end of the outer cylinder 57 has a piston 571, and the piston 571 is fixedly connected to the positioning ring 58 by a connecting rod 573. The inner wall of the outer cylinder 57 has a spring mounting ring 574, and a spring 56 is provided between the spring mounting ring 574 and the positioning ring 58. Under the action of the spring 56, the positioning tooth 581 on the positioning ring 58 extends into between two adjacent locking teeth 551 on the locking ring 55. The positioning ring 58 and the outer cylinder 57 are relatively fixed in the horizontal plane, so the locking ring 55 and the positioning ring 58 are relatively fixed in the horizontal plane, and the support plate 35 and the bottom plate 5 are relatively fixed in the horizontal plane. The lower part of the locking ring 55 extends into the outer cylinder 57. When the angle of the bottom plate 5 needs to be rotated, the piston 571 is pulled downward, and the elastic force of the spring 56 is overcome, so that the positioning tooth 581 of the positioning ring 58 moves between the locking teeth 551 of the locking ring 55, as shown in FIG. Fig.14 As shown, until the positioning teeth 581 of the positioning ring 58 are moved out from between the locking teeth 551 of the locking ring 55, the base plate 5 can be rotated at this time. When the base plate 5 needs to be locked again, the piston 571 is released so that the positioning teeth 581 are extended between two adjacent locking teeth 551 again. Fig.13 As shown, the outer wall of the lower part of the piston 571 has an annular groove 572 to avoid slipping.

[0051] For ease of manufacturing, the high-voltage electrode rod 8 and the low-voltage electrode rod 8' both include an acrylic tube located on the outer layer, a cable 82 located inside the acrylic tube, and an insulating glue filled between the cable 82 and the acrylic tube. The filling insulating glue can reduce the leakage of the high-voltage electrode rod before the discharge gap breaks down, and can also shield the electromagnetic interference to the precision electronic devices caused by the antenna effect, thereby increasing the test accuracy. Fig.15 As shown, the outer walls of the high-voltage electrode rod 8 and the low-voltage electrode rod 8' are provided with a clamping ring 81. The high-voltage electrode rod 8 and the low-voltage electrode rod 8' are installed, and the clamping ring 81 is placed on the fixed electrode plate 61 or the movable electrode plate 75, as shown in FIG. Figure 3 As shown, nuts 83 are then installed on the high voltage electrode rod 8 below the fixed electrode plate 61 and the low voltage electrode rod 8 ′ below the movable electrode plate 75 , and the high voltage electrode rod 8 and the low voltage electrode rod 8 ′ are assembled by means of nuts 83 and retaining rings 81 .

[0052] In order to facilitate the lateral movement of the lateral slide 7 along the mounting block 6 and the vertical movement of the vertical slide 74 along the lateral slide 7, as shown in FIG. Figure 2 , Fig.19 As shown, the driving unit between the transverse slide 7 and the mounting block 6 includes a first handle 77 and a transmission mechanism, such as Figure 1 As shown, the driving unit between the horizontal slide 7 and the vertical slide 74 includes a second handle 78 and another transmission mechanism, such as Fig.19 As shown, a lead screw 761 is fixed to the output end of the transmission mechanism. The first handle 77 is fixedly connected to the input end of the transmission mechanism, and the second handle 78 is fixedly connected to the input end of another transmission mechanism. Fig.18 As shown, the side wall of the horizontal slide 7 has a nut 76 that cooperates with the lead screw 761. Similarly, the side wall of the vertical slide 74 also has a nut 76 that cooperates with the lead screw 761. When the first handle 77 is shaken, the lead screw 761 is driven to rotate through the transmission mechanism, thereby driving the movement of the nut 76, thereby realizing the movement of the horizontal slide 7 relative to the mounting block 6. When the second handle 78 is shaken, the lead screw 761 is driven to rotate through the transmission mechanism, thereby driving the movement of the nut 76 on the side wall of the vertical slide 74, thereby realizing the movement of the vertical slide 74 relative to the horizontal slide 7. Fig.19As shown, the transmission mechanism specifically includes a lead screw 761, a driven bevel gear 761 coaxially arranged with the lead screw 761, a driving bevel gear 763 meshing with the driven bevel gear 762, a worm wheel 764 coaxially arranged with the driving bevel gear 763, and a worm 765 meshing with the worm wheel 764, wherein the worm 765 is the input end of the transmission mechanism. In order to facilitate the assembly of the second handle 78 and the lead screw 761, a through hole 73 is provided on the top wall of the transverse slide 7 to facilitate the extension of the lead screw 761 shaft. Similarly, a through hole is also provided on the side wall of the mounting block 6, and the lead screw shaft of the lead screw 761 that drives the transverse slide to move passes through the through hole and is fixedly connected to the first handle 77.

[0053] To achieve the sliding connection between the transverse slide 7 and the mounting side wall of the mounting block 6 (a side wall of the mounting block 6), as Figure 3 As shown, the mounting side wall of the mounting block 6 has a pair of transverse sliding grooves 62, such as Fig.17 , Fig.18 As shown, a slider 71 is provided on the rear side wall of the transverse slide 7, and the slider 71 is slidably connected with the transverse slide groove 62. The slider 71 and the transverse slide groove 62 are both dovetail-shaped. Fig.17 , Fig.18 As shown, the front side wall of the transverse slide 7 has a pair of vertical slide grooves 72 , and a slider is also provided on the rear side wall of the vertical slide 74 to facilitate sliding connection with the vertical slide grooves 72 .

[0054] like Fig.15 As shown, the high-voltage electrode rod 8 is a straight structure, and the lower end of the low-voltage electrode rod 8' has a U-shaped portion 86, one end of the U-shaped portion 86 is connected to the lower end of the low-voltage electrode rod 8' to form a whole, and the low-voltage electrode 85 is located at the end of the other end of the U-shaped portion 86. Both the high-voltage electrode 84 and the low-voltage electrode 85 are conical structures and are made of tungsten-copper alloy, which can slow down the electrode ablation caused by cathode emission during discharge. The high-voltage electrode 84 is threadedly connected to the high-voltage electrode rod 8, and the low-voltage electrode 85 is threadedly connected to the low-voltage electrode rod 8', which is convenient for replacement.

[0055] The beneficial effects of the present invention are as follows: the present invention can adjust the gap size of the discharge gap, and can realize the offset between the high-voltage electrode and the low-voltage electrode in the horizontal plane, so as to study the rock crushing effect of different discharge gaps; the present invention adjusts the relative position between the rock and the discharge gap by rotating the bottom plate in the horizontal plane, so as to study the rock crushing effect at different positions between the rock and the discharge gap; when adjusting the relative position between the high-voltage and low-voltage electrodes, only the first and second handles need to be operated, which is convenient to operate; the rock is clamped conveniently and firmly, so that the crushing effect of the shock wave on the rock can be fully studied; the rock clamping assembly and the positioning rod are convenient to assemble and easy to operate.

Claims

1. Rock crushing experimental device based on underwater pulse discharge shock wave, characterized in that: The invention comprises a water tank, a rock clamping assembly and an electrode rod clamping assembly, wherein a positioning rod is provided at the bottom of the water tank, the rock clamping assembly is located inside the water tank, the rock clamping assembly comprises a fixing rod, a locking rod and a clamping unit, the fixing rod is a hollow structure and has an adjustable length, a supporting plate is provided on the fixing rod, the fixing rod is sleeved on the positioning rod, the locking rod is threadedly connected to the upper part of the positioning rod and contacts with the top of the fixing rod; the clamping unit comprises a bottom plate and a clamping plate, the bottom plate is rotatably mounted on the top of the supporting plate, the clamping plate has two pieces and is fixed to the top of the bottom plate by bolts, the side wall of the clamping plate has an insertion rod, the insertion rod is used to extend into the drill hole on the rock, the bottom of the supporting plate has a positioning unit, the positioning unit comprises an outer cylinder and a positioning ring, the outer cylinder is fixedly connected to the supporting plate, the positioning ring is movably arranged on the inner side of the outer cylinder and the top of the positioning ring has a positioning tooth, the bottom of the bottom plate has a locking ring, the bottom of the locking ring has a locking tooth, and when the positioning tooth extends between two adjacent locking teeth on the locking ring, the bottom plate and the supporting plate are relatively fixed; The water tank is provided with a mounting block on the top, and the electrode rod clamping assembly comprises a fixed electrode plate, a transverse slide, a vertical slide and a movable electrode plate, wherein the fixed electrode plate is fixed to the mounting side wall of the mounting block, and a low-voltage electrode rod is fixedly mounted on the fixed electrode plate, and a low-voltage electrode is provided at the lower end of the low-voltage electrode rod; the transverse slide is slidably connected with the mounting side wall of the mounting block in the transverse direction, and the vertical slide is slidably connected with the transverse slide in the vertical direction, the mounting block is provided with a driving unit for driving the transverse slide to move, and the transverse slide is provided with another driving unit for driving the vertical slide to move; the movable electrode plate is fixed to the vertical slide, and a high-voltage electrode rod is fixedly mounted on the movable electrode plate, and a high-voltage electrode is provided at the lower end of the high-voltage electrode rod, and a discharge gap is formed between the high-voltage electrode and the low-voltage electrode, and a discharge gap is formed between the high-voltage electrode and the low-voltage electrode, and a discharge gap is formed between the high-voltage electrode and the low-voltage electrode, and a discharge gap is formed between the high-voltage electrode and the low-voltage electrode. It has a cable connected to the high-voltage electrode, and the low-voltage electrode rod has another cable connected to the low-voltage electrode, and the two cables are connected to the high-voltage power supply; the driving unit between the horizontal slide and the mounting block includes a first handle and a transmission mechanism, and the driving unit between the horizontal slide and the vertical slide includes a second handle and another transmission mechanism, and a lead screw is fixed to the output end of the transmission mechanism; the first handle is fixedly connected to the input end of the transmission mechanism, and the second handle is fixedly connected to the input end of the other transmission mechanism, and the side wall of the horizontal slide and the side wall of the vertical slide have a nut that cooperates with the lead screw; the high-voltage electrode rod is a linear structure, and the lower end of the low-voltage electrode rod has a U-shaped portion, one end of the U-shaped portion is connected to the lower end of the low-voltage electrode rod to form a whole, and the low-voltage electrode is located at the end of the other end of the U-shaped portion; The positioning rod comprises a base and a vertical rod, the base is fixedly connected to the bottom of the water tank, the top of the base is provided with a blind hole, the side wall of the upper part of the base is provided with a plurality of slots, the lower end of the vertical rod extends into the blind hole and is fixedly connected to the base; the bottom of the fixing rod is provided with an insert block, after the insert block is inserted into the slot, the fixing rod and the positioning rod are relatively fixed in a horizontal plane; the fixing rod comprises an upper rod and a lower rod arranged up and down, the upper rod and the lower rod are both hollow structures, the bottom of the upper rod is fixed with a connecting cylinder, and the connecting cylinder is threadedly connected to the upper part of the lower rod; the supporting plate is fixed to the outer wall of the upper rod, and the top of the upper rod is provided with a convex ring contacting with the bottom of the locking rod; the positioning ring is located in the upper end of the outer cylinder, the lower end of the outer cylinder is provided with a piston, the piston and the positioning ring are fixedly connected by a connecting rod, the inner wall of the outer cylinder is provided with a spring mounting ring, a spring is provided between the spring mounting ring and the positioning ring, and the positioning teeth on the positioning ring extend between two adjacent locking teeth on the locking ring under the action of the spring.

2. The rock crushing experimental device based on underwater pulse discharge shock wave according to claim 1 is characterized in that: The inner side of the locking rod is a threaded hole, the upper part of the vertical rod has an external thread, and the inner wall of the threaded hole has an internal thread that matches the external thread.

3. The rock crushing experimental device based on underwater pulse discharge shock wave according to claim 2 is characterized in that: There are two positioning rods and two fixing rods, and the supporting plates on the outer walls of the two fixing rods are connected to form a whole.

4. The rock crushing experimental device based on underwater pulse discharge shock wave according to claim 1 is characterized in that: The high-voltage electrode rod and the low-voltage electrode rod both include an acrylic tube located on the outer layer, a cable located in the acrylic tube, and insulating glue filled between the cable and the acrylic tube.

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