Composite ground penetrating probe

Abstract

The utility model provides a kind of composite geological grounding needle, it is related to electric power operation field;Including the connecting rod and drill rod of integrated connection, the one end of connecting rod is provided with electric hammer connector and ground wire connecting piece, electric hammer connector is used to be connected with electric hammer, and ground wire connecting piece is used to connect ground wire;Drill rod is connected at the one end of connecting rod away from electric hammer connector, drill rod includes drill bit and the first threaded portion and second threaded portion extending along its axial direction, the first threaded portion is connected with connecting rod and away from drill bit, and the thread pitch of first threaded portion is greater than the thread pitch of second threaded portion;Drill bit is conical, and its outer coating has multilayer nanometer tungsten carbide coating.The application can be suitable for frozen soil layer and small block rock and other complex geological environment, solve the problem, such as low penetration efficiency, easy to damage, rely on large equipment, etc of traditional grounding needle, improve the construction efficiency and grounding stability of electric power repair and production scene.

Description

Technical Field

[0001] This utility model relates to the field of power operation, and more specifically, to a composite geological grounding pin. Background Technology

[0002] The grounding system is a core component for ensuring the safe operation of power equipment. Its core component, the grounding pin, must meet the requirements of low resistance and high stability under various geological conditions.

[0003] However, in special geological environments such as permafrost and small rocks, the design and construction of traditional grounding pins face significant challenges, directly affecting emergency repair efficiency, equipment safety, and long-term operation and maintenance costs. Utility Model Content

[0004] The purpose of this invention is to provide a composite geological grounding needle that is suitable for complex geological environments such as frozen soil and small rocks, solving the problems of low penetration efficiency, easy damage, and reliance on large equipment of traditional grounding needles, thereby improving the construction efficiency and grounding stability in power emergency repair and production scenarios.

[0005] The embodiments of this utility model are implemented as follows:

[0006] This application provides a composite geological grounding pin, including an integrally connected connecting rod and a drill rod. One end of the connecting rod is provided with an electric hammer connector and a grounding wire connecting piece. The electric hammer connector is used to connect to an electric hammer, and the grounding wire connecting piece is used to connect to a grounding wire.

[0007] The drill rod is connected to the end of the connecting rod away from the electric hammer connector. The drill rod includes a drill bit and a first threaded portion and a second threaded portion extending axially thereon. The first threaded portion is connected to the connecting rod and away from the drill bit. The thread pitch of the first threaded portion is greater than the thread pitch of the second threaded portion.

[0008] The drill bit is conical and coated with a multi-layer nano-tungsten carbide coating.

[0009] Furthermore, based on the aforementioned scheme, handles perpendicular to the connecting rod are respectively connected to the opposite sides of the connecting rod near the electric hammer connector.

[0010] Furthermore, based on the aforementioned solution, the connecting rod is provided with locking positions on opposite sides, and the locking positions are arranged opposite each other below the handle along the axial direction of the connecting rod; the handle is hinged to the connecting rod and locked by a locking member, and the handle can be locked into the locking positions.

[0011] Furthermore, based on the aforementioned scheme, the cone angle of the drill bit is 28°.

[0012] Furthermore, based on the aforementioned scheme, the hardness of the drill bit is 68±2; the drill rod is made of 2CrMo alloy steel with a boron-impregnated layer on its surface, and the hardness of the drill rod is 45-50.

[0013] Furthermore, based on the aforementioned scheme, the length of the connecting rod is 35-45cm, the length of the drill rod is 75-85cm, wherein the length of the first threaded portion is greater than the length of the second threaded portion.

[0014] Furthermore, based on the aforementioned scheme, the length of the first threaded portion is 45-55cm, and the length of the second threaded portion is 25-35cm.

[0015] Furthermore, based on the aforementioned scheme, the length of the handle is 45-55cm.

[0016] Compared with the prior art, the embodiments of this utility model have at least the following advantages or beneficial effects:

[0017] This application features an integrated connecting rod and drill rod. A hammer drill connector and a grounding wire connector are located at one end of the connecting rod, enabling detachable connection to the hammer drill and accommodating both manual and manual operation. The grounding wire connector also allows for connection to a grounding wire. The drill rod incorporates a drill bit, a first threaded section, and a second threaded section. The first threaded section is closer to the connecting rod, and the second threaded section is closer to the drill bit. The thread pitch of the first threaded section is greater than that of the second threaded section, creating a dense thread near the drill bit and a sparse thread away from it. The dense thread section provides self-tapping guidance, enabling rapid rock and frozen soil breaking, while the sparse thread facilitates chip removal and anchoring. This combination provides comprehensive guidance and anchoring of the drill rod, improving construction efficiency. The threaded structure also allows for self-locking and frost-resistant pull-out protection during frozen soil drilling. The drill bit is tapered and coated with multiple layers of nano-tungsten carbide, providing high hardness and forming a self-sharpening tungsten carbide needle tip for rapid rock breaking. After wear, the coating gradient detachment maintains the cone angle, extending service life. This application is applicable to complex geological environments such as permafrost and small rocks, and solves the problems of low penetration efficiency, easy damage and reliance on large equipment of traditional grounding pins, thereby improving the construction efficiency and grounding stability in power emergency repair and production scenarios. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the composite geological grounding needle in an embodiment of the present invention.

[0020] Icons: 1-Connecting rod, 11-Hammer connector, 12-Grounding wire connector, 13-Handle, 14-Clocking position, 2-Drill rod, 21-Drill bit, 22-First threaded part, 23-Second threaded part. Detailed Implementation

[0021] Through analysis of existing technologies, the inventors discovered that the design and construction of traditional grounding pins face significant challenges in special geological environments such as permafrost and small rock formations, directly impacting emergency repair efficiency, equipment safety, and long-term operation and maintenance costs. Specifically, these challenges manifest in the following ways:

[0022] For environments with small rock fragments: First, there is a mismatch in mechanical strength. Small rock fragments (granite / basalt) have a compressive strength of 50-300 MPa, making conventional grounding electrodes (hardness HRC22-28) prone to bending and breakage, with a failure rate as high as 40%. Second, there is an abnormal current distribution. A region of abrupt potential difference change forms at the rock-soil interface, with local field strength exceeding 30 kV / m, accelerating the corrosion of the grounding electrode. Therefore, traditional vertical grounding electrodes are difficult to adapt to the irregular structure of fractured rock strata, and the contact area between the grounding system and the rock-soil interface is less than 30% of the standard value.

[0023] In permafrost environments: First, conductivity deteriorates. The resistivity of permafrost can be 5-10 times that of non-permafrost (>1000Ω·m), leading to excessive grounding resistance and potentially causing equipment damage and personal injury during short circuits. Second, physical construction obstacles arise. The hardness of permafrost is close to that of concrete (Mohs hardness 2-3), making it difficult for traditional vertical grounding pins (0.8m-1.2m in length) to penetrate, and manual hammering reduces efficiency by more than 60%. Existing grounding materials (galvanized steel, copper-clad steel) lack resistance to frost heave fatigue, and seasonal construction in northern regions relies on large machinery, extending emergency repair response times.

[0024] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0025] Please refer to Figure 1 The diagram shown is a schematic representation of the overall structure of the composite geological grounding pin.

[0026] This embodiment provides a composite geological grounding needle, including an integrally connected connecting rod 1 and a drill rod 2. One end of the connecting rod 1 is provided with an electric hammer connector 11 and a grounding wire connecting piece 12. The electric hammer connector 11 is used to connect to the electric hammer, and the grounding wire connecting piece 12 is used to connect to the grounding wire.

[0027] The drill rod 2 is connected to the end of the connecting rod 1 away from the electric hammer connector 11. The drill rod 2 includes a drill bit 21 and a first threaded portion 22 and a second threaded portion 23 extending along its axial direction. The first threaded portion 22 is connected to the connecting rod 1 and away from the drill bit 21. The thread pitch of the first threaded portion 22 is greater than the thread pitch of the second threaded portion 23.

[0028] The drill bit 21 is conical and coated with a multi-layer nano-tungsten carbide coating.

[0029] The following will further describe a composite geological grounding needle according to this exemplary embodiment.

[0030] In some embodiments, the grounding pin comprises an integrally connected connecting rod 1 and a drill rod 2, with a total length designed to be 110-130cm, preferably 120cm. The connecting rod 1 is 35-45cm long, preferably 40cm, and the drill rod 2 is 75-85cm long, preferably 80cm. One end of the connecting rod 1 is equipped with a hammer drill connector 11, which is compatible with the SDS-plus standard (supporting 3500 impacts / minute). This connector is used for detachable connection with the hammer drill, allowing switching between hammer drill and manual operation in different geological scenarios, accommodating both frozen soil penetration depth (≥1.0m) and shallow rock anchoring requirements. In hammer drill mode, the frozen soil penetration speed can reach ≥0.6m / min.

[0031] The connecting rod 1 is connected to handles 13 perpendicular to the connecting rod 1 on opposite sides near the electric hammer connector 11. The handles 13 are easy to operate manually. The handles 13 have an arm length of 45-55cm, preferably 50cm, and a lever ratio of 1:5. In manual mode, a single person can apply an equivalent pressure of 1kN.

[0032] In a preferred embodiment, the connecting rod 1 is provided with locking positions 14 on opposite sides, and the locking positions 14 are positioned opposite each other along the axial direction of the connecting rod 1 below the handle 13. The handle 13 is hinged to the connecting rod 1 and locked by a locking member, and the handle 13 can be locked into the locking position 14. By providing a movable handle 13, the handle 13 can be folded downward in the electric hammer mode, so that it fits against the side wall of the connecting rod 1 and is locked into the locking position 14, which can prevent the handle 13 from affecting the operation of the electric hammer mode. The locking member can be a locking bolt or other connection structure. The locking position 14 can be composed of two limiting plates facing each other, and the opposite side of the two limiting plates is shaped to fit the handle 13. For example, if the handle 13 is a cylinder, its inner side is arc-shaped.

[0033] In some embodiments, the drill rod 2 is connected to the end of the connecting rod 1 away from the hammer drill connector 11. The drill rod 2 includes a drill bit 21 and a first threaded portion 22 and a second threaded portion 23 extending along its axial direction. The first threaded portion 22 is connected to the connecting rod 1 and away from the drill bit 21. The thread pitch of the first threaded portion 22 is greater than the thread pitch of the second threaded portion 23, and the thread height is 2 mm. The length of the first threaded portion 22 is 45-55 cm, preferably 50 cm, and the length of the second threaded portion 23 is 25-35 cm, preferably 30 cm.

[0034] The drill rod 2 forms a double-helix structure with a densely threaded section near the drill bit 21 and a loosely threaded section away from the drill bit 21. The length of the first threaded section 22 is greater than the length of the second threaded section 23. The densely threaded section breaks rock / frozen soil. When the grounding pin begins to screw in, the high-density thread crests first contact the surface of the frozen soil layer (rock). More contact points instantly disperse the initial pressure, greatly improving positioning stability and effectively preventing slippage and deviation. The sharp crests and small tooth angles make it like a set of precision micro-milling cutters, which can efficiently and with low resistance cut out the initial, tiny thread grooves, rather than forcibly squeezing the material, which significantly reduces the starting torque. The loosely threaded section achieves chip removal and anchoring. When rotating, the loose threads form a wide spiral groove, and the broken rock chips are "scooped up" by the threaded inclined surface and transported backward along the spiral channel. The large pitch avoids the accumulation of rock chips between the threads, reducing the risk of stuck drill bit. At the same time, the loose threads form a "thread-rock" meshing structure with the borehole wall, resisting axial pull-out force.

[0035] The spiral structure design with double threaded sections improves rock breaking efficiency by 50% and frozen soil chip removal speed by 40%, avoiding blockage; moreover, the threaded structure is self-locking and frost-resistant, increasing frost-pull resistance by >4kN.

[0036] In some embodiments, the drill bit 21 is conical and coated with a multilayer nano-tungsten carbide coating to form a self-sharpening tungsten steel tip. This allows the new, sharp part underneath to be automatically exposed through the peeling off of local material during use, thereby actively resisting the passivation trend.

[0037] In a preferred embodiment, the cone angle of the drill bit 21 is 28°. The 28° cone angle, combined with a nano-tungsten carbide coating (hardness HRC 68), ensures that the acute angle remains >25° after wear due to the coating's gradient shedding. This allows it to penetrate rock formations with a compressive strength ≤180MPa (such as limestone and sandstone), extending its service life by three times.

[0038] In a preferred embodiment, the drill bit 21 has a hardness of 68±2; the drill rod 2 is made of 2CrMo alloy steel with a boron-diffused layer on its surface, and has a hardness of 45-50. The main body of the drill rod 2 is made of 42CrMo alloy steel with surface boron-diffused treatment, which makes the bending strength ≥1200MPa and the corrosion resistance improved by 200% (salt spray test >500h).

[0039] Working principle of the embodiments in this application:

[0040] 1. Electric hammer mode (high-efficiency penetration):

[0041] Construction in frozen soil layers:

[0042] Steps: Install the electric hammer → Switch to impact mode → Vertical penetration → Rotate and lock after reaching the target depth. Efficiency: ≤4 minutes for a depth of 1.2m in -15℃ frozen soil.

[0043] Construction of rock layers:

[0044] Steps: Switch to rotary impact mode → Pre-crush rock mass with needle tip → Threaded graded hole enlargement and anchoring

[0045] Capability: Can break rocks with a Mohs hardness ≤5 (such as shale and slate).

[0046] 2. Manual Mode (Emergency Repair):

[0047] Operating procedure: Positioning → Rotate the dual handles clockwise 13 → Cut the formation in the dense thread section → Remove cuttings in the reverse direction every 30cm of drilling.

[0048] In one specific embodiment (based on laboratory and field testing):

[0049] Frozen soil penetration: In frozen soil at -20℃ (15% moisture content), the construction time to a depth of 1.2m in electric hammer mode was 3 minutes and 50 seconds.

[0050] Rock anchoring: In granite fragment formations, pull-out force ≥18kN (more than twice the national standard).

[0051] Abrasion resistance: After 50 consecutive penetrations through sandstone, the needle tip wear is less than 0.3 mm, and the thread integrity remains at 90%.

[0052] This application achieves three major breakthroughs through its short-distance high-precision structure (1.2-meter total length + 0.8-meter thread), dual-mode power adaptation (high efficiency of electric hammer + emergency manual operation), and self-sharpening-bending resistance collaborative design (tungsten steel tip + boron-infiltrated steel body), making it suitable for use in various different geological scenarios.

[0053] Frozen soil layer: Through threaded self-locking anti-freeze pull-out, high-frequency impact of electric hammer + loose thread chip removal, the frost pull-out resistance is >4kN, taking into account both deep penetration and anti-freeze pull-out stability, and the construction efficiency is improved by 5-8 times.

[0054] Small rock layers: self-sharpening tungsten steel needle tip breaks rock, high-rigidity drill rod with 2 steel for bending resistance, breaking through the hardness limit of traditional grounding needles, reducing the failure rate by 60%, increasing the rock penetration rate by 70%, and bending strength >1100MPa.

[0055] In the absence of electricity: the dual-handle 13-inch manual rotary cutting method, with self-tapping guidance for the tight thread section, completes 1.2m full-depth construction in 30 minutes, achieving reliable 1.2m full-depth construction in manual mode for the first time, improving emergency repair efficiency by 70%.

[0056] Furthermore, unless otherwise explicitly specified or limited, the terms "installation" and "connection" in this application embodiment should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. The terms "upper," "lower," "left," "right," "inner," "outer," and "side," etc., are merely for reference to the direction in the accompanying drawings or the usual placement of the product during use. They are only for clearly describing this application and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limitations on this application. The terms "first," "second," etc., are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance; "multiple" refers to at least two. In this application embodiment, the limitations on relative positional relationships such as parallel, perpendicular, and aligned are all relative to the current technological level and are not absolutely strict limitations. Slight deviations are allowed; approximations of parallel, perpendicular, and aligned are all acceptable. For example, "A and B are parallel" means that A and B are parallel or approximately parallel, and the angle between A and B can be between 0 degrees and 10 degrees.

[0057] The above are only some embodiments and implementation methods of this application. The protection scope of this application is not limited thereto. In the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. Any combination of features in different embodiments is also within the protection scope of this application. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the protection scope of this application.

Claims

1. A composite geological grounding pin, characterized in that, It includes an integrally connected connecting rod and a drill rod. One end of the connecting rod is provided with an electric hammer connector and a grounding wire connector. The electric hammer connector is used to connect to the electric hammer, and the grounding wire connector is used to connect to the grounding wire. The drill rod is connected to the end of the connecting rod away from the electric hammer connector. The drill rod includes a drill bit and a first threaded portion and a second threaded portion extending axially therefrom. The first threaded portion is connected to the connecting rod and away from the drill bit. The thread pitch of the first threaded portion is greater than the thread pitch of the second threaded portion. The drill bit is conical and coated with a multi-layer nano-tungsten carbide coating.

2. The composite geological grounding pin according to claim 1, characterized in that, The connecting rod has handles perpendicular to it on both sides near the electric hammer connector.

3. The composite geological grounding pin according to claim 2, characterized in that, The connecting rod is provided with locking positions on opposite sides, and the locking positions are arranged opposite each other along the axial direction of the connecting rod below the handle; the handle is hinged to the connecting rod and locked by a locking member, and the handle can be locked into the locking positions.

4. The composite geological grounding pin according to claim 1, characterized in that, The drill bit has a cone angle of 28°.

5. The composite geological grounding pin according to claim 4, characterized in that, The drill bit has a hardness of 68±2; the drill rod is made of 2CrMo alloy steel with a boron-impregnated layer on its surface, and the drill rod has a hardness of 45-50.

6. The composite geological grounding pin according to claim 2, characterized in that, The connecting rod is 35-45cm long, and the drill rod is 75-85cm long, wherein the length of the first threaded part is greater than the length of the second threaded part.

7. The composite geological grounding pin according to claim 6, characterized in that, The length of the first threaded portion is 45-55cm, and the length of the second threaded portion is 25-35cm.

8. The composite geological grounding pin according to claim 7, characterized in that, The length of the handle is 45-55cm.

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