A hydraulic connection device for a stainless steel composite grounding body

By designing a combination device of hydraulic jack, driving mechanism and wire rope, the automatic drop of the grounding body is achieved and the earth is connected, solving the problems of low manual burial efficiency and inconvenient mechanical equipment work, and improving construction efficiency and applicability.

CN119778587APending Publication Date: 2025-04-08ZHEJIANG THERMAL POWER CONSTR CO LTD
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Patent Information

Application Number
CN202510059964.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-15
Publication Date
2025-04-08

AI Technical Summary

Technical Problem

In the prior art, the method of manually burying the grounding body is inefficient and labor-intensive, while mechanical equipment is inconvenient to work in special environments and is difficult to enter narrow spaces or complex geological areas.

Method used

A hydraulic connection device for grounding body in stainless steel composite material is designed, using a combination of hydraulic jack, driving mechanism and wire rope. The driving mechanism of hydraulic jack is reduced by the expansion and contraction control of the hydraulic jack, so that the grounding body can automatically drop and connect it to the ground.

Benefits of technology

It improves the construction efficiency of the connection between the grounding body and the earth, reduces labor intensity, and can work effectively in narrow spaces or complex geological areas, solving the limitations of inconvenient access or work of mechanical equipment.

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Abstract

The present invention relates to the technical field of grounding body connection, and discloses a hydraulic connection device of a grounding body made of a stainless steel composite material, comprising a hydraulic jack, wherein a plurality of supporting rods are arranged on the side of the hydraulic jack, and the plurality of supporting rods are detachably arranged end to end in an upper and lower manner, a driving mechanism is sleeved on the supporting rod, and the driving mechanism can be clamped and sleeved on the grounding body, and a steel wire rope is arranged between the hydraulic jack and the supporting rod, and the driving mechanism and the telescopic end of the hydraulic jack are connected by the steel wire rope, so that the driving mechanism can be controlled to descend during the extension of the hydraulic jack; at the same time, the driving mechanism is sleeved on the grounding body, so that the grounding body can be controlled to descend when the hydraulic jack is extended, that is, the grounding body is inserted into the earth, which solves the problem that the method of artificially burying the grounding body and connecting it to the earth is low in efficiency, and that mechanical equipment is inconvenient to work in special environments.
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Description

Technical Field

[0001] The invention relates to the technical field of grounding body connection, in particular to a hydraulic connection device for a stainless steel composite grounding body. Background Art

[0002] The rapid development of power, electronics, communications and other fields has put forward extremely high requirements on the safety and stability of electrical systems. As one of the important safeguards for the safe operation of electrical systems, grounding plays an increasingly prominent role. With the continuous advancement of science and technology, the power and complexity of various electrical equipment are increasing, and the performance requirements for grounding systems are also getting higher and higher.

[0003] As the core component of the grounding system, the grounding body's embedding method and its quality are directly related to the grounding effect. At present, in order to adapt to different use environments, stainless steel composite grounding bodies made of a layer of composite stainless steel material coated on steel have both the strength of steel and the anti-corrosion properties of stainless steel. Therefore, they have begun to be promoted and applied in power transmission and transformation line grounding, substation grounding, integrated pipe gallery grounding, cable trench grounding and other projects.

[0004] Affected by comprehensive factors such as terrain, on-site obstacles, cost, and progress, the grounding body is mainly buried by simple manual excavation, that is, using shovels and other excavation tools to dig a groove of corresponding depth in a narrow area. At present, the depth of direct connection between the grounding body and the earth is generally between 1.5m and 3.0m, which means that the depth of manual excavation of the groove is at least 1.5m. Although this method can realize the burial of the grounding body and realize the physical connection between the grounding body and the earth, the construction efficiency is low and the labor intensity is high. Especially in complex terrain or large-scale grounding projects, the limitations of manually buried grounding bodies are more obvious.

[0005] With the development of mechanical technology, various mechanical equipment for burying grounding bodies have emerged, such as drilling machines. Through the operation of drilling machines, corresponding grooves can be quickly dug on the ground, and the burying of grounding bodies can be completed efficiently, so that the grounding bodies are connected to the earth, which greatly improves the construction efficiency and reduces the labor intensity. However, mechanical burying is not perfect. In some special environments, such as narrow spaces and areas with complex geological conditions, due to the large size of mechanical equipment, it may not be able to enter narrow spaces or move to areas with complex geology. Even if these workplaces are achieved, mechanical construction may be restricted. Summary of the invention

[0006] The purpose of the present invention is to provide a hydraulic connection device for a stainless steel composite grounding body, which solves the problem that the method of manually burying the grounding body and connecting it to the earth is inefficient and that mechanical equipment is inconvenient to work in special environments.

[0007] The present invention is implemented as follows: a stainless steel composite material grounding body hydraulic connection device, comprising: A hydraulic jack, wherein a plurality of supporting rods are arranged on the side of the hydraulic jack, and the plurality of supporting rods are detachably arranged end to end, and a driving mechanism is sleeved on the supporting rod, and the driving mechanism can be clamped and sleeved on the grounding body, and a steel wire rope is arranged between the hydraulic jack and the supporting rod, and the steel wire rope is symmetrically arranged, and the two free ends of the steel wire rope are respectively connected to the top of the hydraulic jack and the driving mechanism; A rotating shaft body is arranged on the side wall of the hydraulic jack, the middle part of the steel wire rope passes around the rotating shaft of the rotating shaft body, and the steel wire rope and the rotating shaft of the rotating shaft body rotate in coordination.

[0008] As an embodiment of the present invention, the driving mechanism includes a sleeve, a fixed plate and a clamping plate. The sleeve is sleeved on the supporting rod, the fixed plate is fixedly arranged on the side of the sleeve, one end of the clamping plate is hingedly connected to one end of the fixed plate, and the other end is connected to the fixed plate bolt, and the grounding body passes through the space formed by the clamping plate and the fixed plate.

[0009] As an embodiment of the present invention, a screw is fixedly provided on the side wall of the sleeve, and a first arc groove is provided at the same time, and a fitting plate is provided on the side of the sleeve.

[0010] As an embodiment of the present invention, a second arc groove is arranged on the side wall of the bonding plate, and through the bonding sleeve arrangement, the end of the wire rope extends into the space formed by the second arc groove and the first arc groove.

[0011] As an embodiment of the present invention, the rotating shaft is installed at the bottom of the hydraulic jack, and a top column is fixedly provided at the telescopic end of the hydraulic jack. A lifting plate is sleeved on the top column, and the other end of the wire rope is connected to the lifting plate.

[0012] As an embodiment of the present invention, the limiting mechanism includes an annular plate and two symmetrically arranged limiting plates, the two limiting plates are connected by bolts, one of the limiting plates is fixedly connected to the annular plate, and a limiting bolt is threadedly provided on the side wall of the annular plate.

[0013] As an embodiment of the present invention, a grounding body is arranged through a space formed by two limiting plates, and the radius of the space formed by the two limiting plates is larger than the radius of the grounding body; a plurality of sockets are arranged on the supporting rod, and the plurality of sockets are arranged along the height direction of the supporting rod, the annular plate is sleeved on the supporting rod, and the end of the limiting bolt is inserted into a certain socket.

[0014] As an embodiment of the present invention, a thread groove is arranged on the top of the support rod, and a thread column is arranged on the bottom, and the thread column is threadably inserted into an adjacent thread groove.

[0015] As an embodiment of the present invention, a base is provided under the hydraulic jack, a connecting hole is provided on a column fixed at the end of the base, a threaded hole is provided at the bottom of the connecting hole, the lower end of the lowest supporting rod extends into the connecting hole, and the threaded column is threadedly inserted into the threaded hole.

[0016] As an embodiment of the present invention, a snap groove is provided on the lower side of the base, the end of the snap groove is set to be an opening, a snap plate is inserted in the snap groove, an auxiliary plate is fixedly provided at the end of the snap plate, and the lower side of the auxiliary plate is flush with the lower side of the base.

[0017] The beneficial effects brought by the present invention are: 1. The present invention is provided with a hydraulic jack, and a driving mechanism is provided on the side of the hydraulic jack, and the driving mechanism and the telescopic end of the hydraulic jack are connected by a steel wire rope, so that the driving mechanism can be controlled to descend during the extension of the hydraulic jack; at the same time, the driving mechanism is sleeved on the grounding body, so that when the hydraulic jack is extended, the grounding body can be controlled to descend, that is, the grounding body is inserted into the ground to achieve connection between the grounding body and the ground, which changes the current situation of low efficiency and high labor intensity of manual excavation, and inconvenience for mechanical equipment to enter or work in narrow spaces.

[0018] 2. The present invention sets a rotating shaft at the bottom of the hydraulic jack, and the steel wire rope is symmetrically arranged with the rotating shaft as the starting point, so that the two ends of the steel wire rope extend to the telescopic end and the driving mechanism of the hydraulic jack respectively, to provide support for the telescopic end and the driving mechanism of the hydraulic jack to achieve reverse movement.

[0019] 3. The present invention is provided with a limiting mechanism, which forms a space through which the grounding body passes under the action of two limiting plates. At the same time, the size of the space is larger than the diameter of the grounding body. When the position of the grounding body is limited, it cooperates with the driving mechanism to limit the descending direction of the grounding body, thereby providing convenience for better completing the connection between the grounding body and the earth. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention, so that other features, purposes and characteristics of the present invention become more obvious. The drawings and descriptions of the exemplary embodiments of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of the present invention and a grounding body; Figure 3 It is a structural schematic diagram of the hydraulic jack of the present invention; Figure 4 It is a structural schematic diagram of the base and auxiliary plate of the present invention; Figure 5It is a structural schematic diagram of the support rod of the present invention; Figure 6 It is a structural schematic diagram of the driving mechanism of the present invention; Figure 7 It is a structural schematic diagram of the limiting mechanism of the present invention.

[0022] In the figure: hydraulic jack 1; wire rope 11; top column 12; lifting plate 13; base 14; connecting hole 15; auxiliary plate 16; snap groove 17; snap plate 18; rotating shaft 19; supporting rod 2; plug hole 21; threaded groove 22; threaded column 23; driving mechanism 3; fixing plate 31; clamping plate 32; sleeve 33; first arc groove 34; screw 35; fitting plate 36; second arc groove 37; limiting mechanism 4; annular plate 41; limiting plate 42; limiting bolt 43. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0025] Example 1 In order to adapt to different working environments, it can efficiently complete the connection between the grounding body and the earth. This embodiment provides a new device for burying the grounding body in the earth. Because the device is small in size and light in weight, it can be moved to the workplace by the staff, and the grounding body is forced to be buried in the earth under the action of the device to achieve the connection between the grounding body and the earth, changing the current situation of low efficiency and high labor intensity of manual excavation, and inconvenience for mechanical equipment to enter or work in narrow spaces. The specific technical scheme of the device is shown below.

[0026] like Figure 1 , Figure 2As shown, the device includes a hydraulic jack 1, a supporting rod 2, a steel wire rope 11 and a driving mechanism 3. The hydraulic jack 1 is a hydraulic telescopic cylinder that has been disclosed for manually controlling the rocker arm to force hydraulic oil. The hydraulic jack 1 is installed on a base 14, and a column is fixedly arranged at the end of the base 14, and a connecting hole 15 is arranged on the column 1, so that the lower end of the supporting rod 2 is inserted into the connecting hole 15. Specifically, the supporting rod 2 can be stably connected to the column by bolts, and the supporting rod 2 can also be inserted into the connecting hole 15 by threaded connection. In short, the supporting rod 2 is vertically arranged on the side of the hydraulic jack 1. The driving mechanism 3 is movably sleeved on the supporting rod 2, and the end away from the supporting rod 2 can be clamped and sleeved on the grounding body. Therefore, in the process of the driving mechanism 3 moving relative to the supporting rod 2, the grounding body can be controlled to move, which provides convenience for the grounding body to be inserted into the ground and connected to the ground.

[0027] A rotating shaft 19 is provided on the side wall of the hydraulic jack 1 , and the middle part of the steel wire rope 11 passes around the rotating shaft of the rotating shaft 19 , and the steel wire rope 11 and the rotating shaft of the rotating shaft 19 are rotatably matched.

[0028] like Figure 1 , Figure 3 As shown, in order to control the lifting and lowering of the driving mechanism 3, a rotating shaft 19 is provided at one end of the hydraulic jack 1 adjacent to the supporting rod 2 through a bearing connection, and the wire rope 11 is symmetrically arranged with respect to the rotating shaft 19 for lifting, that is, the wire rope 11 is redirected at the rotating shaft 19, and both free ends are located above the base 14, and at the same time, the two free ends are respectively connected to the top of the hydraulic jack 1 and the driving mechanism 3.

[0029] Therefore, during the extension of the hydraulic jack 1, the driving mechanism 3 can be controlled to descend, forcing the grounding body to be inserted into the ground. If the extension length of the hydraulic jack 1 is limited, the extension of the hydraulic jack 1 and the operation of adjusting the position of the driving mechanism 3 relative to the grounding body can be repeated multiple times to achieve the connection between the grounding body and the ground, which is determined according to actual conditions. In addition, the number of steel wire ropes 11 can also be determined according to actual conditions.

[0030] like Figure 5 As shown, in order to adapt to grounding bodies of different lengths, the number of supporting rods 2 can be set to more than two, and adjacent supporting rods 2 are connected end to end. In order to stably connect adjacent supporting rods 2 and adjust the number of connected supporting rods 2 according to needs, the top of the supporting rod 2 is provided with a thread groove 22, and the bottom is provided with a thread column 23, and the thread column 23 is threadedly inserted into the adjacent thread groove 22. Therefore, under the cooperation of the thread column 23 and the thread groove 22, adjacent supporting rods 2 are stably and detachably connected.

[0031] like Figure 3 , Figure 5As shown, in the case where a threaded column 23 is provided at the bottom of the supporting rod 2, in order to install the supporting rod 2 on the base 14, a threaded hole is provided at the bottom of the connecting hole 15, the lower end of the lowest supporting rod 2 extends into the connecting hole 15, and the threaded column 23 is threadedly inserted into the threaded hole. Therefore, under the premise that the supporting rod 2 and the base 14 are stably connected, the supporting rod 2 can be disassembled as needed, the size of the device can be reduced, the device can be stored, and convenience is provided for the staff to transfer the device.

[0032] like Figure 6 As shown, in order to control the grounding body to descend and be inserted into the ground through the driving mechanism 3, the driving mechanism 3 includes a sleeve 33, a fixing plate 31 and a clamping plate 32. The sleeve 33 is sleeved on the supporting rod 2 and can be lifted and lowered relative to the supporting rod 2. The fixing plate 31 is fixedly arranged on the side of the sleeve 33. One end of the clamping plate 32 is hingedly connected to one end of the fixing plate 31, and the other end is bolted to the fixing plate 31. The grounding body penetrates the space formed by the clamping plate 32 and the fixing plate 31, that is, under the action of the clamping plate 32, the fixing plate 31 and the clamping plate 32 are tightly clamped to the grounding body. Therefore, under the action of the driving mechanism 3, the supporting rod 2 is stably placed relative to the grounding body, and the lifting direction of the grounding body can be limited under the action of the supporting rod 2.

[0033] like Figure 6 As shown, in addition, a screw rod 35 is fixedly provided on the side wall of the sleeve 33, and a fitting plate 36 is provided on the side of the sleeve 33. The fitting plate 36 is provided in an arc-shaped structure and is adapted to the outer wall of the sleeve 33. In addition, a through hole is provided on the fitting plate 36. Therefore, the fitting plate 36 is sleeved on the screw rod 35, and a nut is threadedly sleeved on the end of the screw rod 35. Therefore, under the action of the nut, the fitting plate 36 can be stably installed relative to the sleeve 33, and the end of the wire rope 11 can be stably clamped with the cooperation of the fitting plate 36 and the sleeve 33, so that the wire rope 11 is stably connected to the driving mechanism 3. In order to limit the position of the wire rope 11 relative to the bonding plate 36 and the sleeve 33, a first arcuate groove 34 is provided on the side wall of the sleeve 33, and a second arcuate groove 37 is provided on the side wall of the bonding plate 36. The first arcuate groove 34 and the second arcuate groove 37 are opposite to each other, and the central angle of the arcuate groove is less than 90°. Therefore, the end of the wire rope 11 can stably extend into the space formed by the second arcuate groove 37 and the first arcuate groove 34.

[0034] like Figure 3As shown, in order to stably connect the other end of the steel wire rope 11 to the hydraulic jack 1, a top column 12 is fixedly provided at the telescopic end of the hydraulic jack 1, and a lifting plate 13 is sleeved on the top column 12, and the other end of the steel wire rope 11 is connected to the lifting plate 13. Specifically, a hole can be provided on the lifting plate 13, and the steel wire rope 11 is provided through the hole, and the end portion provided near the lifting plate 13 is knotted, so that the steel wire rope 11 can be stably placed relative to the lifting plate 13. A similar structure can also be provided on the lifting plate 13 with reference to the connection method of the fixed plate 31 and the clamping plate 32, so that the steel wire rope 11 can also be stably connected to the lifting plate 13.

[0035] like Figure 4 As shown, in order to place the device stably on the ground and work stably, a snap groove 17 is provided on the lower side of the base 14, the end of the snap groove 17 is set to be open, a snap plate 18 is inserted at the snap groove 17, an auxiliary plate 16 is fixedly provided at the end of the snap plate 18, and the lower side of the auxiliary plate 16 is flush with the lower side of the base 14. Therefore, with the cooperation of the snap plate 18 and the snap groove 17, the auxiliary plate 16 is stably placed relative to the base 14, and the position of the auxiliary plate 16 relative to the base 14 can be adjusted according to needs, thereby enhancing the stability of the device. The number of snap plates 18, snap grooves 17 and auxiliary plates 16 can be determined according to actual needs. In short, the device should be stably placed.

[0036] Example 2 like Figure 1 , Figure 7 As shown, on the basis of Example 1, in order to limit the stable descent of the grounding body, a limiting mechanism 4 is further provided, and the limiting mechanism 4 includes an annular plate 41 and two symmetrically arranged limiting plates 42, wherein one limiting plate 42 is fixedly connected to the annular plate 41, and the two limiting plates 42 are connected by bolts, so the relative positions of the two limiting plates 42 can be changed by rotating the bolts, and the grounding body passes through the two limiting plates 42 to form a space setting, and the radius of the space formed by the two limiting plates 42 is greater than the radius of the grounding body, so the position of the grounding body can be limited under the action of the two limiting plates 42, and then cooperate with the driving mechanism 3 to limit the descent direction of the grounding body.

[0037] like Figure 5 , Figure 7As shown, in order to make the limiting mechanism 4 adapt to grounding bodies of different sizes, a limiting bolt 43 is threadedly provided on the side wall of the annular plate 41, and a plurality of insertion holes 21 are provided on the support rod 2, and the plurality of insertion holes 21 are provided along the height direction of the support rod 2. The annular plate 41 is sleeved on the support rod 2, and the end of the limiting bolt 43 is inserted into a certain insertion hole 21. Therefore, the cooperation between the limiting bolt 43 and the insertion hole 21 can make the limiting mechanism 4 stably placed relative to the support rod 2. At the same time, the limitation of the annular plate 41 can be released by rotating the limiting bolt 43, and then the position of the limiting mechanism 4 can be adjusted according to the working requirements and the size of the grounding body.

[0038] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A hydraulic connection device for a stainless steel composite grounding body, characterized in that: include: A hydraulic jack (1), wherein a plurality of supporting rods (2) are arranged on the side of the hydraulic jack (1), wherein the plurality of supporting rods (2) are detachably arranged end to end, wherein a driving mechanism (3) is sleeved on the supporting rods (2), and the driving mechanism (3) can be clamped and sleeved on a grounding body; A steel wire rope (11) is arranged between the hydraulic jack (1) and the supporting rod (2), the steel wire rope (11) is symmetrically arranged, and the two free ends of the steel wire rope (11) are respectively connected to the top of the hydraulic jack (1) and the driving mechanism (3); A rotating shaft (19) is arranged on the side wall of the hydraulic jack (1), the middle part of the steel wire rope (11) passes around the rotating shaft of the rotating shaft (19), and the steel wire rope (11) and the rotating shaft of the rotating shaft (19) are rotatably matched.

2. A stainless steel composite grounding body hydraulic connection device according to claim 1, characterized in that: The driving mechanism (3) comprises a sleeve (33), a fixing plate (31) and a clamping plate (32); the sleeve (33) is sleeved on the supporting rod (2); the fixing plate (31) is fixedly arranged on the side of the sleeve (33); one end of the clamping plate (32) is hingedly connected to one end of the fixing plate (31); the other end is bolted to the fixing plate (31); and a grounding body penetrates the space formed by the clamping plate (32) and the fixing plate (31).

3. A stainless steel composite grounding body hydraulic connection device according to claim 2, characterized in that: A screw rod (35) is fixedly arranged on the side wall of the sleeve (33), and a first arc groove (34) is also arranged. A bonding plate (36) is arranged on the side of the sleeve (33).

4. A hydraulic connection device for a stainless steel composite grounding body according to claim 3, characterized in that: A second arc-shaped groove (37) is arranged on the side wall of the bonding plate (36), and is arranged through a bonding sleeve (33), so that the end of the steel wire rope (11) extends into the space formed by the second arc-shaped groove (37) and the first arc-shaped groove (34).

5. A hydraulic connection device for a stainless steel composite grounding body according to claim 4, characterized in that: The rotating shaft (19) is installed at the bottom of the hydraulic jack (1); a top column (12) is fixedly provided at the telescopic end of the hydraulic jack (1); a lifting plate (13) is sleeved on the top column (12); and the other end of the steel wire rope (11) is connected to the lifting plate (13).

6. The hydraulic connection device of a stainless steel composite grounding body according to claim 1, characterized in that: The device also includes a limiting mechanism (4), which includes an annular plate (41) and two symmetrically arranged limiting plates (42), wherein the two limiting plates (42) are connected by bolts, wherein one of the limiting plates (42) is fixedly connected to the annular plate (41), and a limiting bolt (43) is threadedly provided on the side wall of the annular plate (41).

7. A hydraulic connection device for a stainless steel composite grounding body according to claim 6, characterized in that: The grounding body penetrates through the two limiting plates (42) to form a space, and the radius of the space formed by the two limiting plates (42) is greater than the radius of the grounding body; a plurality of plug holes (21) are provided on the supporting rod (2), and the plurality of plug holes (21) are arranged along the height direction of the supporting rod (2); the annular plate (41) is sleeved on the supporting rod (2), and the end of the limiting bolt (43) is inserted into a certain plug hole (21).

8. The hydraulic connection device of a stainless steel composite grounding body according to claim 1, characterized in that: The top of the support rod (2) is provided with a thread groove (22), and the bottom is provided with a thread column (23), and the thread column (23) is threadedly inserted into the adjacent thread groove (22).

9. A hydraulic connection device for a stainless steel composite grounding body according to claim 8, characterized in that: A base (14) is arranged below the hydraulic jack (1), a connecting hole (15) is arranged on a column fixedly arranged at the end of the base (14), a threaded hole is arranged at the bottom of the connecting hole (15), the lower end of the support rod (2) at the lowermost side extends into the connecting hole (15), and the threaded column (23) is threadedly inserted into the threaded hole.

10. A hydraulic connection device for a stainless steel composite grounding body according to claim 9, characterized in that: A snap groove (17) is arranged on the lower side of the base (14), the end of the snap groove (17) is arranged to be open, a snap plate (18) is inserted into the snap groove (17), an auxiliary plate (16) is fixedly arranged at the end of the snap plate (18), and the lower side of the auxiliary plate (16) is flush with the lower side of the base (14).