Modular graphite grounding device suitable for rock foundation pit

Abstract

This invention discloses a modular graphite grounding device suitable for rock foundation pits, belonging to the field of electrical grounding technology. It includes a mounting plate with a mounting hole in the middle and a rotating ring rotatably connected inside. A driven toothed ring is fixedly fitted on the outer side of the rotating ring. A second threaded rod is connected to a bearing on the right side inside the mounting plate, and a toothed sleeve is fitted on the outer side of the second threaded rod. It also includes a telescopic sleeve installed at the bottom of the rotating ring. This modular graphite grounding device for rock foundation pits achieves precise fine-tuning of the initial position and spacing of the support plate through the first threaded rod. The second threaded rod drives the clamping plate to firmly clamp the graphite grounding body. Combined with the shared rotating ring design, it pushes the support plate to conform to the hole wall, ultimately achieving reliable positioning of the grounding body, flexible adaptation to complex drilling conditions, and stable and efficient operation of the grounding system.

Description

Technical Field

[0001] This invention relates to the field of electrical grounding technology, specifically to a modular graphite grounding device suitable for rock foundation pits. Background Technology

[0002] Rock foundation pits are mostly distributed in mountainous and highland areas, with geological conditions mainly consisting of hard rock, scarce soil, and generally high soil resistivity, making them a typical complex scenario for grounding engineering. Soil resistivity is a core indicator for measuring soil conductivity. In rock foundation pit areas, due to the complex soil composition, lack of conductive ions, dense soil structure, and low moisture content, it is difficult to form a good conductive path, resulting in high current conduction resistance and poor diffusion. Traditional grounding methods cannot meet the stringent grounding resistance requirements of electrical systems in such environments, resulting in poor grounding performance and inability to provide reliable protection for electrical equipment. Therefore, it is necessary to adopt grounding devices with high-carbon graphite as the core substrate, modified to enhance conductivity, compressive strength, and corrosion resistance, combined with standardized, modular structures and specialized construction techniques for rock foundation pits, to precisely adapt to complex geological conditions and achieve stable and reliable grounding functionality. However, existing modular graphite grounding devices still have the following shortcomings in practical use: Due to the poor toughness of graphite and the lack of clamping and fixing structures in the device, the grounding electrode is not effectively constrained in the borehole. Affected by construction vibration, soil settlement, or groundwater flow, it is prone to axial sliding, rotation, and other displacement, which damages the adhesion with the backfill conductive material. At the same time, gaps are easily formed between the grounding electrode and the borehole wall, making it difficult to fill the backfill conductive and resistance-reducing material densely. The air left in the gaps will significantly increase the contact resistance. In addition, the diameter and verticality of the borehole in the rock foundation pit are affected by geological conditions and the precision of the construction equipment, and the placement of the grounding electrode may be deviated. The device is not convenient to flexibly accommodate grounding electrodes of different diameters and borehole diameter and verticality deviations. The external support structure is difficult to find the optimal fitting position, which easily leads to loose fitting or incompatibility.

[0003] To address the aforementioned issues, innovative designs are urgently needed based on existing approaches. Summary of the Invention

[0004] The purpose of this invention is to provide a modular graphite grounding device suitable for rock foundation pits, so as to solve the problems mentioned in the background art. The technical solution of this invention provides a solution that is significantly different from the existing technology, which is too simplistic.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a modular graphite grounding device suitable for rock foundation pits, comprising a mounting plate, wherein a mounting hole is provided in the middle of the mounting plate, and a rotating ring is rotatably connected inside the mounting plate, a driven toothed ring is fixedly sleeved on the outer side of the rotating ring, and a second threaded rod is connected to the right bearing inside the mounting plate, and a toothed sleeve is sleeved on the outer side of the second threaded rod. It also includes a telescopic sleeve, which is installed at the bottom of the rotating ring. A double-acting positioning and clamping assembly is provided inside the mounting plate above the driven toothed ring. An adjusting ring is provided inside the mounting plate below the telescopic sleeve, and a position fine-tuning assembly is provided inside the adjusting ring. A first threaded rod is connected to the left front bearing of the adjusting ring inside the mounting plate, and a threaded sleeve block is sleeved on the outside of the first threaded rod.

[0006] Preferably, the front end of the second threaded rod extends out of the outer surface of the mounting plate, the toothed sleeve and the second threaded rod are threadedly connected, the right side of the toothed sleeve is slidably connected to the inner wall of the mounting plate, and the toothed sleeve and the driven toothed ring are meshed.

[0007] Preferably, the top end of the first threaded rod extends out of the upper surface of the mounting plate, the threaded sleeve block is threadedly connected to the first threaded rod, and the right side of the threaded sleeve block is fixedly connected to the outer side of the adjusting ring by bolts, and the telescopic sleeve is slidably disposed inside the mounting plate.

[0008] Preferably, the dual-action positioning and clamping assembly includes a bevel gear ring, which is mounted on top of the rotating ring. The outer inclined surface of the bevel gear ring is connected to bevel gears at equal angles, and each of the four bevel gears has a lead screw fixedly connected to its opposite end. A movable plate is sleeved and fixed to the outer side of the lead screw, and clamping plates are bolted to the opposite ends of the four movable plates. A support plate is provided at equal angles below the interior of the adjusting ring, and a wedge plate is connected at equal angles above the support plate inside the adjusting ring. The bottom of the wedge plate is hinged to the inner side of the support plate via a connecting plate. A contact block is fixedly connected at equal angles to the bottom of the telescopic sleeve.

[0009] Preferably, the bevel gear ring, driven gear ring, and telescopic sleeve share a common rotating ring, the four lead screws are distributed at equal angles about the center point of the bevel gear ring inside the mounting plate, and the lead screw bearings are connected inside the mounting plate, the movable plate is arranged in a horizontal "L" shape, and the four clamping plates are distributed at equal angles on the inner wall of the mounting hole.

[0010] Preferably, the positions of the bonding block and the wedge plate correspond one-to-one, and the bottom of the bonding block and the top of the wedge plate are both inclined, and the bonding block and the inclined surface of the wedge plate are bonded together.

[0011] Preferably, the position fine-tuning component includes four movable seats, which are equally distributed at the upper position inside the adjusting ring. The top of the movable seats is provided with an oblique guide groove, and a return spring is installed between the outer side of the movable seats and the inner wall of the adjusting ring. A guide rod is fixed at an equal angle inside the mounting plate above the adjusting ring.

[0012] Preferably, the movable seat is fan-shaped, and the bottom of the movable seat is connected to the top of the support plate by a limiting sliding connection, and the top of the movable seat is limited and slidably disposed on the top of the inner wall of the adjusting ring by a slider.

[0013] Preferably, the inner wall of the inclined guide groove is inclined, and the position of the inclined guide groove corresponds to that of the guide rod, with the bottom of the guide rod fitting against the inclined surface of the inclined guide groove.

[0014] Preferably, the wedge plate extends through the interior of the movable seat, and the movable seat and the wedge plate are connected by a limiting sliding connection.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention drives the toothed sleeve to move through the second threaded rod, and uses the synchronous linkage of the driven toothed ring and the bevel toothed ring to drive the four clamping plates to move towards the center of the mounting hole, thereby clamping the graphite grounding body, thus forming rigid transmission and uniform clamping force, which can effectively resist the influence of external forces such as construction vibration and soil settlement, completely avoid axial displacement or rotation of the graphite grounding body, and ensure the stability of the grounding body installation position.

[0016] 2. This invention utilizes a shared rotating ring design of the driven toothed ring, bevel toothed ring, and telescopic sleeve to achieve synchronous linkage of multiple components. This pushes the support plate to expand outward and fit tightly against the inner wall of the hole, forming a reliable radial support fixation. This eliminates the gap between the device and the hole wall, allowing the backfill conductive material to fill more densely, reducing air residue, significantly reducing contact resistance, ensuring long-term stability of grounding resistance, and improving the operational reliability of the grounding system.

[0017] 3. In this invention, by rotating the first threaded rod in the forward or reverse direction, the support plate can be driven to move down or up synchronously. At the same time, the guide rod, the inclined guide groove and the return spring are used to expand or contract the support plate outward, thereby adjusting the distance between the support plate and the drill hole. This ensures that when the clamping plate firmly clamps the graphite grounding body, the support plate can be tightly fitted to the inner wall of the drill hole. This allows it to adapt to graphite grounding bodies of different diameters and specifications, while also allowing the support plate to accurately find the optimal initial fitting position, ensuring installation stability and adaptability. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the main cross-sectional structure of the mounting plate of the present invention; Figure 2 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 3 This is a schematic diagram of the connection structure between the second threaded rod and the toothed sleeve of the present invention; Figure 4 This is a schematic diagram of the connection structure between the support plate and the movable seat of the present invention; Figure 5 This is a three-dimensional structural diagram of the movable base, support plate, and reset spring of the present invention; Figure 6 This is a schematic diagram of the main cross-sectional structure of the regulating ring of the present invention; Figure 7 This is a side sectional view of the movable seat structure of the present invention; Figure 8 This is a schematic diagram showing the disassembled structure of the bevel gear ring, driven gear ring, and rotating ring of the present invention; Figure 9 For the present invention Figure 6 Enlarged structural diagram at point A in the middle.

[0019] In the diagram: 1. Mounting plate; 2. Rotating ring; 3. Driven gear ring; 4. Gear sleeve; 501. Bevel gear ring; 502. Bevel gear; 503. Lead screw; 504. Movable plate; 505. Clamping plate; 506. Support plate; 507. Connecting plate; 508. Adhesive block; 509. Wedge plate; 6. Telescopic sleeve; 7. First threaded rod; 8. Threaded sleeve block; 901. Moving seat; 902. Return spring; 903. Guide rod; 904. Inclined guide groove; 10. Adjusting ring; 11. Second threaded rod. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figures 1-9This invention provides a technical solution: a modular graphite grounding device suitable for rock foundation pits, comprising a mounting plate 1, a mounting hole in the middle of the mounting plate 1, a rotating ring 2 rotatably connected inside the mounting plate 1, a driven toothed ring 3 fixedly fitted on the outer side of the rotating ring 2, a second threaded rod 11 connected to the right bearing inside the mounting plate 1, and a toothed sleeve 4 fitted on the outer side of the second threaded rod 11, the front end of the second threaded rod 11 extending out of the outer surface of the mounting plate 1, the toothed sleeve 4 being threadedly connected to the second threaded rod 11, and the right side of the toothed sleeve 4 being flush with the inner wall of the mounting plate 1. The components are slidably connected, and the gear sleeve 4 and the driven gear ring 3 are meshed; it also includes a telescopic sleeve 6, which is installed at the bottom of the rotating ring 2. The first threaded rod 7 is connected to the bearing on the left front side of the adjusting ring 10 inside the mounting plate 1, and a threaded sleeve block 8 is sleeved on the outer side of the first threaded rod 7. The top end of the first threaded rod 7 extends out of the upper surface of the mounting plate 1. The threaded sleeve block 8 and the first threaded rod 7 are threadedly connected, and the right side of the threaded sleeve block 8 is fixedly connected to the outer side of the adjusting ring 10 by bolts. The telescopic sleeve 6 is slidably disposed inside the mounting plate 1.

[0022] In one embodiment of the present invention, after drilling the rock foundation pit according to the design requirements, the rock cuttings and dust inside the hole are first cleaned to ensure that there are no large loose rocks on the hole wall (the drilling diameter must be compatible with the adjustment range of the device). Then, the mounting plate 1 is placed in the corresponding position of the drilling hole, so that the mounting hole on the mounting plate 1 is precisely aligned with the drilling hole. Then, according to the grounding depth requirements, multiple sections of graphite grounding body are spliced ​​together using conductive connectors to ensure that the connection parts fit tightly and there are no gaps. Next, the spliced ​​graphite grounding body is passed through the mounting hole of the mounting plate 1 and slowly inserted into the drilling hole. At the same time, the workers use a special tool to gently tap the top of the grounding body to gradually extend it. The device is inserted into the borehole until it reaches the designated position. Then, a double-acting positioning and clamping assembly is used to achieve double fixation: on the one hand, it firmly clamps the graphite grounding electrode to prevent it from sliding or rotating axially; on the other hand, it simultaneously supports the borehole wall to eliminate the gap between the device and the borehole wall. Subsequently, graphite-based conductive mortar and other backfill conductive and resistance-reducing materials are slowly injected into the borehole to ensure that the material fully fills all gaps between the device and the borehole wall, and between the grounding electrode and the assembly. The filling process must ensure that it is dense and free of air residue. After the backfill material has initially set, the top of the grounding electrode is marked and protected, and a protective cap is installed to seal the end to prevent groundwater and impurities from intruding and causing corrosion.

[0023] Inside the mounting plate 1, above the driven gear ring 3, is a double-acting positioning and clamping assembly. This assembly includes a bevel gear ring 501, mounted on top of the rotating ring 2. The outer inclined surface of the bevel gear ring 501 is connected to bevel gears 502 at equal angles. Each of the four bevel gears 502 has a lead screw 503 fixedly connected to its opposite end. A movable plate 504 is sleeved and fixed to the outer side of the lead screw 503. Each of the four movable plates 504 has a clamping plate 505 fixed to its opposite end by bolts. Inside the adjusting ring 10, below the adjusting ring 10, is a support plate 506 at equal angles. Inside the adjusting ring 10, above the support plate 506, is a wedge plate 509 at equal angles. The bottom of the wedge plate 509 is connected to the support plate 506. The inner sides of 06 are hinged together by connecting plate 507. The bevel ring 501, driven tooth ring 3 and telescopic sleeve 6 share a rotating ring 2. The four lead screws 503 are distributed at equal angles with respect to the center point of the bevel ring 501 inside the mounting plate 1, and the lead screws 503 are connected to the bearing inside the mounting plate 1. The movable plate 504 is set in a horizontal "L" shape. The four clamping plates 505 are distributed at equal angles on the inner wall of the mounting hole. The bottom of the telescopic sleeve 6 is fixedly connected with a fitting block 508 at equal angles. The positions of the fitting block 508 and the wedge plate 509 correspond one-to-one. The bottom of the fitting block 508 and the top of the wedge plate 509 are both inclined. The fitting block 508 is in contact with the inclined surface of the wedge plate 509.

[0024] In one embodiment of the present invention, by rotating the second threaded rod 11, the gear sleeve 4 can be driven to move and drive the driven gear ring 3 to rotate. Since the driven gear ring 3 and the bevel gear ring 501 share the same rotating ring 2, the bevel gear ring 501 rotates synchronously with it and drives the four bevel gears 502 to move in conjunction, thereby driving the corresponding four lead screws 503 to rotate. During this process, the movable plates 504 on the four lead screws 503 move synchronously, driving the four clamping plates 505 to move towards the center of the bevel gear ring 501, thereby achieving a stable clamping and fixing of the graphite grounding body. This can effectively resist the influence of external forces such as construction vibration and soil settlement, prevent the graphite grounding body from shifting, and because the driven gear ring 3 and the bevel gear ring 501 share the same rotating ring 2, the driven gear ring 3 and the bevel gear ring 501 rotate synchronously with it and drive the four bevel gears 502 to move in conjunction, thereby driving the four lead screws 503 to rotate. The toothed ring 501 and the telescopic sleeve 6 share the same rotating ring 2. When the driven toothed ring 3 rotates, the beveled toothed ring 501 and the telescopic sleeve 6 move in sync. At this time, the telescopic sleeve 6 drives the four bottom contact blocks 508 to rotate. The contact blocks 508 press the wedge plate 509 to move it downward, thereby driving the connecting plate 507 to rotate and pushing the support plate 506 to expand outward. Finally, the four support plates 506 move outward in sync and fit tightly against the inner wall of the borehole, thus forming a reliable radial support fixation. This effectively prevents the graphite grounding body from shifting or loosening in the borehole. The gap between the contact blocks is eliminated, allowing the backfill conductive material to fill more densely, reducing air residue, lowering contact resistance, and ensuring stable grounding resistance.

[0025] An adjusting ring 10 is located inside the mounting plate 1, below the telescopic sleeve 6. A position fine-tuning component is installed inside the adjusting ring 10, comprising four movable seats 901. These movable seats 901 are evenly distributed at the upper part of the adjusting ring 10. Each movable seat 901 has a slanted guide groove 904 at its top. A return spring 902 is installed between the outer side of the movable seat 901 and the inner wall of the adjusting ring 10. The movable seats 901 are arranged in a fan shape, and the bottom of the movable seat 901 is flush with the top of the support plate 506. The movable seat 901 is slidably connected to the inner wall of the adjusting ring 10 by a slider. The mounting plate 1 is fixed with a guide rod 903 at an equal angle above the adjusting ring 10. The inner wall of the inclined guide groove 904 is inclined and the positions of the inclined guide groove 904 and the guide rod 903 are corresponding. The bottom of the guide rod 903 is in contact with the inclined surface of the inclined guide groove 904. The wedge plate 509 penetrates the interior of the movable seat 901 and the movable seat 901 and the wedge plate 509 are slidably connected.

[0026] In one embodiment of the present invention, the first threaded rod 7 drives the threaded sleeve 8 to move the adjusting ring 10 downward, thereby simultaneously moving the four internal moving seats 901 and the support plate 506 downward (at this time, the telescopic sleeve 6 extends downward to ensure that the fitting block 508 and the wedge plate 509 are on the same horizontal plane). This can adapt to installation requirements of different depths and avoid the support plate 506 from being unable to be accurately aligned due to drilling depth deviation. During this process, the guide rod 903 disengages from the inclined guide groove 904, the squeezing effect of the guide rod 903 on the inclined guide groove 904 is released, and the moving seat 901 returns to its original position under the elastic force of the return spring 902. The position ultimately drives the four support plates 506 to expand outward synchronously. When the first threaded rod 7 is rotated in the opposite direction, the adjusting ring 10 moves upward, and the guide rod 903 is inserted into the inclined guide groove 904 and squeezes the groove wall, pushing the moving seat 901 to move synchronously, thereby driving the support plate 506 to retract and reset inward, realizing the adjustment of the distance between the support plate 506 and the drill hole. This ensures that when the clamping plate 505 firmly clamps the graphite grounding body, the support plate 506 can be tightly fitted with the inner wall of the drill hole at the same time, so as to adapt to graphite grounding bodies of different diameters. At the same time, it allows the support plate 506 to accurately find the optimal initial fitting position, ensuring installation stability and adaptation flexibility.

[0027] Working Principle: When using this modular graphite grounding device suitable for rock foundation pits, first complete the drilling of the rock foundation pit according to the design, clean the rock cuttings and dust inside the hole (ensuring no loose rocks on the hole wall and that the hole diameter is compatible with the device's adjustment range), place the mounting plate 1 at the drill hole, align the mounting holes on the plate with the drill hole, and splice multiple sections of graphite grounding body with conductive connectors (ensuring tight connections without loose connections). Insert the graphite grounding body through the mounting holes of the mounting plate 1 into the drill hole, gently tap the top of the grounding body to the designed position, and then rotate the first threaded rod 7 in the forward or reverse direction. Through the threaded sleeve block 8 and the adjusting ring 10, the moving seat 901 and the support plate 506 move down or up synchronously (the telescopic sleeve 6 is adapted to the length). At the same time, the guide rod 903 cooperates with the inclined guide groove 904, and the return spring 902 assists. The system assists in the synchronous expansion or contraction of the support plate 506, adjusting its distance from the borehole to accommodate grounding bodies of different diameters and find the optimal contact position. Then, the second threaded rod 11 is rotated to drive the toothed sleeve 4 and the driven toothed ring 3 to rotate (which are synchronously linked with the rotating ring 2 shared by the bevel toothed ring 501 and the telescopic sleeve 6): on the one hand, it drives the bevel gear 502 and the lead screw 503 to rotate, causing the clamping plate 505 to converge towards the center and securely clamp the grounding body; on the other hand, it drives the bottom contact block 508 of the telescopic sleeve 6 to rotate, squeezing the wedge plate 509 to push the outer support hole wall of the support plate 506 to form radial fixation. Then, graphite-based conductive mortar and other backfill materials are injected into the borehole to fill all gaps and ensure compaction. After the material has initially set, the top of the grounding body is marked and protected, and a protective cap is installed for sealing.

[0028] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A modular graphite grounding device suitable for rock foundation pits, comprising a mounting plate (1), wherein a mounting hole is provided in the middle of the mounting plate (1), and a rotating ring (2) is rotatably connected inside the mounting plate (1), a driven toothed ring (3) is sleeved and fixed on the outer side of the rotating ring (2), and a second threaded rod (11) is connected to the right bearing inside the mounting plate (1), and a toothed sleeve (4) is sleeved on the outer side of the second threaded rod (11). Its features are: It also includes a telescopic sleeve (6), which is installed at the bottom of the rotating ring (2). A double-acting positioning clamping assembly is provided inside the mounting plate (1) above the driven toothed ring (3). An adjusting ring (10) is provided inside the mounting plate (1) below the telescopic sleeve (6), and a position fine-tuning assembly is provided inside the adjusting ring (10). A first threaded rod (7) is connected to the left front bearing of the adjusting ring (10) inside the mounting plate (1), and a threaded sleeve block (8) is sleeved on the outside of the first threaded rod (7).

2. The modular graphite grounding device suitable for rock foundation pits according to claim 1, characterized in that: The front end of the second threaded rod (11) extends out of the outer surface of the mounting plate (1). The toothed sleeve (4) and the second threaded rod (11) are threaded together, and the right side of the toothed sleeve (4) is slidably connected to the inner wall of the mounting plate (1). The toothed sleeve (4) and the driven toothed ring (3) are meshed together.

3. A modular graphite grounding device suitable for rock foundation pits according to claim 1, characterized in that: The top end of the first threaded rod (7) extends out of the upper surface of the mounting plate (1). The threaded sleeve (8) is threadedly connected to the first threaded rod (7), and the right side of the threaded sleeve (8) is fixedly connected to the outer side of the adjusting ring (10) by bolts. The telescopic sleeve (6) is slidably disposed inside the mounting plate (1).

4. A modular graphite grounding device suitable for rock foundation pits according to claim 1, characterized in that: The dual-action positioning and clamping assembly includes a bevel ring (501), which is mounted on the top of the rotating ring (2). The outer inclined surface of the bevel ring (501) is connected to bevel gears (502) at equal angles. The opposite ends of the four bevel gears (502) are all fixedly connected to lead screws (503). The outer side of the lead screws (503) is fitted with movable plates (504). The opposite ends of the four movable plates (504) are all fixed with clamping plates (505) by bolts. The lower part of the adjusting ring (10) is provided with a support plate (506) at equal angles. The inside of the adjusting ring (10) is connected with a wedge plate (509) at equal angles above the support plate (506). The bottom of the wedge plate (509) is hinged to the inner side of the support plate (506) by a connecting plate (507). The bottom of the telescopic sleeve (6) is fixedly connected with a fitting block (508) at equal angles.

5. A modular graphite grounding device suitable for rock foundation pits according to claim 4, characterized in that: The bevel gear ring (501), driven gear ring (3) and telescopic sleeve (6) share a rotating ring (2). The four lead screws (503) are distributed at equal angles with respect to the center point of the bevel gear ring (501) inside the mounting plate (1), and the lead screws (503) are connected to the inside of the mounting plate (1) by bearings. The movable plate (504) is arranged in a horizontal "L" shape. The four clamping plates (505) are distributed at equal angles on the inner wall of the mounting hole.

6. A modular graphite grounding device suitable for rock foundation pits according to claim 4, characterized in that: The positions of the bonding block (508) and the wedge plate (509) are one-to-one, and the bottom of the bonding block (508) and the top of the wedge plate (509) are both inclined, and the inclined surfaces of the bonding block (508) and the wedge plate (509) are in contact.

7. A modular graphite grounding device suitable for rock foundation pits according to claim 1, characterized in that: The position fine-tuning component includes a movable seat (901), four movable seats (901) are distributed at equal angles at the upper position inside the adjusting ring (10), and the top of the movable seat (901) is provided with an inclined guide groove (904), and a return spring (902) is installed between the outer side of the movable seat (901) and the inner wall of the adjusting ring (10). The mounting plate (1) is fixed with a guide rod (903) at equal angles above the adjusting ring (10).

8. A modular graphite grounding device suitable for rock foundation pits according to claim 7, characterized in that: The movable seat (901) is arranged in a fan shape, and the bottom of the movable seat (901) and the top of the support plate (506) are connected by a limiting sliding connection. The top of the movable seat (901) is limited and slidably arranged on the top of the inner wall of the adjusting ring (10) by a slider.

9. A modular graphite grounding device suitable for rock foundation pits according to claim 7, characterized in that: The inner wall of the inclined guide groove (904) is inclined, and the position of the inclined guide groove (904) corresponds to that of the guide rod (903). The bottom of the guide rod (903) is in contact with the inclined surface of the inclined guide groove (904).

10. A modular graphite grounding device suitable for rock foundation pits according to claim 7, characterized in that: The wedge plate (509) penetrates the interior of the movable seat (901), and the movable seat (901) and the wedge plate (509) are connected by a limiting sliding connection.

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