Grounding device for power failure maintenance

Abstract

The grounding device comprises a grounding rod body and a U-shaped hook head with an opening and an accommodating cavity, two groups of tongue pieces driven by an elastic device are symmetrically arranged in the accommodating cavity, one side of the hook head is connected with a grounding annealed copper wire through a ground wire connecting device, and the grounding device further comprises a transition connecting mechanism. The upper end and the lower end of the transition connecting mechanism are detachably arranged with the hook head and the grounding rod body respectively, the transition connecting mechanism is rotationally connected with the grounding rod body, an opening limiting device is arranged in the transition connecting mechanism, and relative rotation of the transition connecting mechanism and the grounding rod body drives the opening limiting device to ascend or descend, so that an opening of the hook head is blocked or opened. According to the utility model, the opening of the double-tongue type grounding rod can be closed by using the additionally arranged limiting device, so that the double-tongue type grounding rod is prevented from accidentally falling off due to accidental touch of maintenance personnel, and potential safety hazards are reduced.

Description

Technical Field

[0001] The utility model relates to an electric power maintenance tool, in particular to a grounding device for power outage maintenance. Background Art

[0002] Currently, during the maintenance and overhaul of power equipment, according to the "State Grid Electric Power Safety Work Regulations," grounding wires must be connected during power outages for maintenance. This prevents damage to maintenance personnel from residual charges on the lines, sudden power surges, or induced currents from live lines adjacent to the outage lines. Ground rods are the most commonly used grounding device, offering advantages such as a simple structure and ease of use. They are widely used for grounding indoors and outdoors during power outages for maintenance of power equipment.

[0003] Existing grounding rods are mainly divided into flat-end grounding rods, monkey-head grounding rods and double-tongue grounding rods according to the clamping method of the conductive part to be clamped.

[0004] The patent application number is 202020123455.3, and the name is "A Double-tongue Grounding Rod". It discloses a double-tongue grounding rod, including a hook head and a grounding rod body. The hook head includes a tongue, a cantilever end, a fixed end, a grounding wire, a grounding wire, a winding column and a connecting pipe. The cantilever end is located on one side of the hook head, and the fixed end is located on the other side of the hook head. The tongue includes a first tongue, a second tongue, a cavity, a limit block, a spring and a clamping block. The above scheme can solve the problem that the grounding rod is laborious to use and has poor conductivity with the ground. Through the new structure of the tongue, by opening cavities at the top and bottom of the cantilever end and the fixed end, and setting springs in the cavities, the sliding reverse stress of the tongue is reduced when the hook clamps the wire, which makes it easier to operate, saves time and effort, and after the operation is completed, due to the characteristics of the spring, the tongue will return to its original position. At the same time, the presence of the limit block prevents the tongue from popping out.

[0005] When using a double-tongue ground rod, place the hook head over the outside of the conductive part to be clamped (such as a cable or terminal). Then, pull the ground rod inward. The two tongues built into the hook head clamp the conductive part under the action of a spring. To remove the ground rod, push the ground rod outward to remove the conductive part from the two tongues. Because double-tongue ground rods are relatively simple to operate, they are more widely used.

[0006] However, precisely because double-tongue ground rods are simple to install and remove, they pose a risk of accidental removal due to accidental contact, particularly in confined spaces such as indoors or within high-voltage cabinets. For example, after grounding a terminal in a high-voltage cabinet, if maintenance personnel accidentally touch the ground rod (e.g., with their arm during maintenance or with their body while turning), the rod will move forward. This can cause the rod to fall off accidentally, posing a significant safety hazard.

[0007] On the other hand, the driving method of the tongue in some existing double-tongue grounding rods is not reasonable enough. A horizontal spring connected to the tongue is used as the driving method, and the clamping effect needs to be further improved. Utility Model Content

[0008] The purpose of the utility model is to provide a grounding device for power outage maintenance, which can use an additional limit device to close the opening of the double-tongue grounding rod, prevent the maintenance personnel from accidentally touching it and causing the double-tongue grounding rod to fall off accidentally, thereby reducing safety hazards.

[0009] The utility model adopts the following technical solutions:

[0010] A grounding device for power outage maintenance includes a grounding rod body and a U-shaped hook head with an opening and a accommodating cavity. Two groups of tongues driven by elastic devices are symmetrically arranged in the accommodating cavity. One side of the hook head is connected to the grounding soft copper wire through a ground wire connecting device. The device also includes a transition connection mechanism. The upper and lower ends of the transition connection mechanism are detachably arranged with the hook head and the grounding rod body respectively, and the transition connection mechanism is rotatably connected to the grounding rod body. The transition connection mechanism has an opening limit device built in. The relative rotation of the transition connection mechanism and the grounding rod body drives the opening limit device to rise or fall, thereby forming a blockage or opening of the hook head opening.

[0011] The transition connection mechanism includes a hollow shell, and a guide hole with an outer end inclined upward is provided on one side of the shell adjacent to the hook head opening; the opening limit device includes a lifting part and a blocking part connected to each other, and the lifting part rises or falls with the relative rotation of the shell and the grounding rod body; the blocking part extends outward through the guide hole or is retracted inward into the shell as the lifting part rises or falls.

[0012] The upper end of the transition connection mechanism is sleeved on the outer side of the fixed end of the hook head and is connected via a positioning pin.

[0013] The lifting part is located in the shell and is rotatably connected to the upper end of the threaded rod.

[0014] The lower part of the shell of the transition connection mechanism is provided with a connecting plate, and the middle part of the connecting plate is provided with a threaded hole; the upper end of the grounding rod body is provided with a threaded rod; the grounding rod body and the transition connection mechanism are threadedly connected through the threaded rod and the threaded hole.

[0015] The upper end of the threaded rod is a polished rod, a limiting groove is arranged on the polished rod along the circumference, and the lifting part is arranged in the limiting groove and is rotatably connected to the polished rod.

[0016] The blocking portion adopts a blocking plate, the lower end of the blocking plate is fixedly connected to the side of the lifting portion close to the hook head opening, and the upper end of the blocking plate is located in the guide through hole.

[0017] The blocking plate is an elastic metal blocking plate.

[0018] The overhanging end of the hook head is provided with a slot which is matched with the blocking plate.

[0019] The inner wall of the hook head is provided with a tongue movable cavity, the lower end of the tongue is hinged to the tongue movable cavity, a torsion spring is provided between the bottom wall of the tongue movable cavity and the middle part of the tongue, and the torsion spring drives the upper end of the tongue to move toward the middle part of the tongue movable cavity; the middle parts of the two tongues are correspondingly provided with conductive part limiting structures.

[0020] The utility model utilizes an additional transition connection mechanism, and the relative rotation of the transition connection mechanism and the grounding rod body drives the opening limit device to rise or fall, thereby blocking or opening the hook head opening, thereby preventing the double-tongue grounding rod from accidentally falling off due to accidental touch by maintenance personnel.

[0021] The upper and lower ends of the transition connection mechanism of the utility model are detachably arranged with the hook head and the grounding rod body, so as to facilitate maintenance and replacement of components.

[0022] The utility model has a simple structure, strong practicality, and is easy to process and produce, with low production costs. At the same time, the utility model can also be implemented on the basis of the existing double-tongue grounding rod by adding a transition connection mechanism, and the grounding rod body with a threaded rod is completely consistent with the grounding rod body structure in the existing flat-end grounding rod, which greatly reduces the cost of use for enterprises. The utility model is simple to operate and safe and reliable. After the elastic metal sealing plate is pressed against the inner side of the overhanging end of the hook head, it can not only achieve reliable sealing of the hook head opening, but also ensure effective electrical connection between the conductive part and the hook head or the elastic metal sealing plate when the double-tongue grounding rod accidentally falls off, thereby ensuring the grounding effect and eliminating safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural diagram of the utility model;

[0024] Figure 2 This is a schematic diagram of the structure of the hook head of the present invention when it is open;

[0025] Figure 3 This is a schematic diagram of the structure of the hook head when the opening is blocked in the utility model;

[0026] Figure 4 This is a schematic structural diagram of the hook head in the utility model;

[0027] Figure 5 This is a schematic diagram of the connection structure between the housing and the threaded rod in the present invention;

[0028] Figure 6 This is a schematic diagram of the connection structure of the connecting plate, the housing and the threaded rod in the present invention. DETAILED DESCRIPTION

[0029] The present invention is described in detail below with reference to the accompanying drawings and embodiments:

[0030] like Figures 1 to 6 As shown, the grounding device for power outage maintenance described in the present invention includes a grounding rod 1 and a U-shaped hook head 2. The lower portion of the hook head 2 has an opening 3 for the passage of a conductor to be clamped (such as a cable, terminal, etc.). The two sides of the opening 3 of the hook head 2 are respectively the fixed end 2-2 and the hanging end 2-1 of the hook head 2. The hook head 2 has a receiving cavity 5 for arranging tongues 4 to clamp the conductor to be clamped. The receiving cavity 5 has two sets of tongues 4 driven by an elastic device symmetrically arranged. The elastic force of the elastic device can drive the two tongues 4 to clamp the conductor to be clamped. One side of the hook head 2 is connected to the grounding soft copper wire through the grounding wire connection device 6 to form a connection between the conductor to be clamped, the hook head 2, the grounding wire connection device 6, the grounding soft copper wire and the grounding wire clamp, thereby achieving a grounding effect.

[0031] To prevent the double-tongue grounding rod from accidentally falling out due to accidental contact by maintenance personnel, the present invention also includes a transition connection mechanism 7. The upper end of the transition connection mechanism 7 is detachably connected to the fixed end 2-2 of the hook head 2, and the lower end of the transition connection mechanism 7 is detachably connected to the grounding rod body 1, facilitating component maintenance and replacement. In this embodiment, the upper end of the transition connection mechanism 7 is sleeved onto the outer side of the fixed end 2-2 of the hook head 2 and connected via a locating pin 8, providing a stable connection and easy disassembly.

[0032] At the same time, the transition connection mechanism 7 is also rotationally connected to the grounding rod body 1. The purpose of the rotational connection is to provide a driving force for the opening limit device built into the transition connection mechanism 7. The relative rotation of the transition connection mechanism 7 and the grounding rod body 1 drives the opening limit device to rise or fall, ultimately forming a blockage or opening of the hook head 2 opening 3. During the grounding operation, the hook head 2 opening 3 is in an open state, which facilitates the conductor to be clamped to enter the accommodating cavity 5. When the grounding operation is completed, the maintenance personnel rotate the grounding rod body 1 in the forward (or reverse) direction to drive the opening limit device to rise, so that the hook head 2 opening 3 is in a blocked state to prevent the double-tongue grounding rod from accidentally falling off. When it is necessary to remove the utility model, the grounding rod body 1 is rotated in the reverse (or forward) direction to drive the opening limit device to descend, so that the hook head 2 opening 3 is in an open state again, thereby removing the utility model.

[0033] The coordination structure of the transition connection mechanism 7 and the opening limit device can be realized in a variety of existing ways. Taking into account the working scenario in which the line may be energized and the convenience of operation, in the present invention, the transition connection mechanism 7 includes a hollow shell, and a guide through hole 9 with the outer end tilted upward is provided on one side of the shell adjacent to the opening 3 of the hook head 2; the opening limit device includes a lifting part 10 and a blocking part 11 connected to each other, and the lifting part 10 rises or falls with the relative rotation of the shell and the grounding rod body 1; the blocking part 11 extends outward through the guide through hole 9 and blocks the opening 3 of the hook head 2 as the lifting part 10 rises or falls, or is retracted inwardly to the inside of the shell through the guide through hole 9 and opens the opening 3 of the hook head 2. The guide through hole 9 can provide an operating channel for the action of the blocking part 11, and can guide the movement direction of the blocking part 11, so that the blocking part 11 blocks the opening 3 of the hook head 2 according to the set trajectory.

[0034] like Figure 5 As shown, a connecting plate 13 can be provided at the lower part of the shell of the transition connection mechanism 7, and a threaded hole is provided in the middle of the connecting plate 13; and a threaded rod 12 is provided at the upper end of the grounding rod body 1, and finally the grounding rod body 1 and the transition connection mechanism 7 are threadedly connected through the threaded rod 12 and the threaded hole.

[0035] like Figure 6 As shown, an internal thread 14 can also be directly provided in the inner cavity of the shell of the transition connection mechanism 7 for cooperating with the threaded rod 12 to realize threaded connection.

[0036] The lifting portion 10 is located in the housing of the transition connection mechanism 7 and is rotatably connected to the upper end of the threaded rod 12 , and the threaded rod 12 simultaneously realizes the detachable connection and the rotatable connection between the transition connection mechanism 7 and the grounding rod body 1 .

[0037] To ensure that the blocking portion 11 only moves upward or downward as the lifting portion 10 rises or falls, in this embodiment, the upper end of the threaded rod 12 is a polished rod 15, which is provided with a circumferential limit groove. The lifting portion 10 can be an annular lifting portion, which is positioned within the limit groove and rotatably connected to the polished rod 15. In this case, the threaded rod 12 cooperates with the connecting plate 13 provided with threaded holes, essentially forming the effect of a lead screw. To ensure that the lifting portion 10, threaded rod 12, and connecting plate 13 cooperate to form a reciprocating lead screw, in this embodiment, the blocking portion 11 is provided with a blocking plate. The lower end of the blocking plate is fixedly connected to the side of the lifting portion 10 near the opening 3 of the hook head 2, and the upper end of the blocking plate is located within the guide hole 9. The lifting portion 10 thus acts as a lead screw nut, while the blocking plate and the guide hole 9 cooperate to form a guide rod. Ultimately, the blocking portion 11 rises and falls synchronously with the lifting portion 10, thereby driving the blocking portion 11 to extend outward or retract inward through the guide hole 9.

[0038] Taking the sealing effect into consideration, in this embodiment, the sealing plate is an elastic metal sealing plate. After the sealing plate is extended to the extreme position, it presses against the inner side of the overhanging end 2-1 of the hook head 2 to form a sealing effect. An extension portion is provided at the upper end of the elastic metal sealing plate to prevent the elastic metal sealing plate from being completely recovered into the interior of the shell. In this embodiment, the guide through-hole 9 can be inclined and the upper end can point to the overhanging end 2-1 of the hook head 2 to further limit the movement direction of the elastic metal sealing plate; a slot compatible with the sealing plate can also be provided at the overhanging end 2-1 of the hook head 2. The sealing plate is guided outward by the guide through-hole 9, and the top end of the sealing plate eventually enters the slot to further enhance the stability of the sealing of the opening 3.

[0039] In some existing double-tongue grounding rods, the elastic device used to drive the tongue 4 uses a horizontally placed spring connected to the middle of the tongue 4. Due to the arc-shaped motion trajectory of the tongue 4, the clamping and reset effects of the tongue 4 are poor. In the present utility model, a tongue movable cavity is provided on the inner wall of the hook head 2. The lower end of the tongue 4 is hinged to the tongue movable cavity. A torsion spring 16 is provided between the bottom wall of the tongue movable cavity and the middle of the tongue 4. The torsion spring 16 drives the upper end of the tongue 4 to move toward the middle of the tongue movable cavity, which can further adapt to the motion trajectory of the tongue 4, achieving a better driving effect, thereby further enhancing the clamping and reset effects of the tongue 4. In this embodiment, a conductive portion limiting structure 17 is provided in the middle of each of the two tongues 4 to enhance the limiting effect on the clamped conductor. The conductive portion limiting structure 17 can be provided in the form of anti-slip grooves provided in the middle of the tongue 4, or it can be provided in the form of a corresponding arc-shaped structure as shown in the accompanying drawings.

[0040] In the present invention, the hook head 2 is made of wrought aluminum die-casting, which has high hardness, good electrical conductivity and oxidation resistance.

[0041] In the present invention, the grounding soft copper wire used in conjunction with the present invention uses oxygen-free copper as its conductor and is made of multiple strands twisted together. It has the advantages of low resistance, stable conductivity, and low heat generation. The outer sheath of the grounding soft copper wire is provided with a transparent insulating layer, which can effectively prevent wear and tear on the grounding soft copper wire during use and ensure the personal safety of maintenance personnel. The end of the grounding soft copper wire is provided with a double-hole copper nose connection end, which is integrally formed of copper and is not easily deformed. The grounding wire connection device 6 is adapted to the double-hole copper nose connection end of the grounding soft copper wire.

[0042] In the present invention, the ground rod body 1 is made of epoxy resin glass fiber yarn pultrusion, which has good insulation properties. The lower part of the ground rod body 1 is provided with an insulating plastic handle 18 with anti-slip grooves to further improve the insulation performance.

[0043] The present invention has a simple structure, strong practicality, and is easy to process and produce, with low production cost. At the same time, the present invention can also be implemented on the basis of the existing double-tongue grounding rod by adding a transition connection mechanism 7, and the grounding rod body 1 with a threaded rod 12 is completely consistent with the structure of the grounding rod body 1 in the existing flat-end grounding rod, which greatly reduces the cost of use for enterprises. The present invention utilizes the relative rotation of the transition connection mechanism 7 and the grounding rod body 1 to drive the opening limit device to rise or fall, thereby forming a blockage or opening of the opening 3 of the hook head 2. The operation is simple and safe and reliable. After the elastic metal sealing plate is pressed against the inner side of the overhanging end 2-1 of the hook head 2, it can not only achieve reliable blocking of the opening 3 of the hook head 2, but also ensure effective electrical connection between the conductive part and the hook head 2 or the elastic metal sealing plate when the double-tongue grounding rod accidentally falls off, thereby ensuring the grounding effect and eliminating safety hazards.

Claims

1. A grounding device for power outage maintenance, comprising a grounding rod and a U-shaped hook having an opening and a receiving cavity, wherein two sets of tongues driven by an elastic device are symmetrically arranged in the receiving cavity, and one side of the hook is connected to a grounding soft copper wire through a grounding connection device, characterized in that: It also includes a transition connection mechanism, the upper and lower ends of the transition connection mechanism are respectively detachably arranged with the hook head and the grounding rod body, and the transition connection mechanism is rotatably connected to the grounding rod body. The transition connection mechanism is equipped with an opening limit device. The relative rotation of the transition connection mechanism and the grounding rod body drives the opening limit device to rise or fall, thereby forming a blockage or opening of the hook head opening.

2. The grounding device for power outage maintenance according to claim 1, characterized in that: The transition connection mechanism includes a hollow shell, and a guide hole with an outer end inclined upward is provided on one side of the shell adjacent to the hook head opening; the opening limit device includes a lifting part and a blocking part connected to each other, and the lifting part rises or falls with the relative rotation of the shell and the grounding rod body; the blocking part extends outward through the guide hole or is retracted inward into the shell as the lifting part rises or falls.

3. The grounding device for power outage maintenance according to claim 1, characterized in that: The upper end of the transition connection mechanism is sleeved on the outer side of the fixed end of the hook head and is connected via a positioning pin.

4. The grounding device for power outage maintenance according to claim 2, characterized in that: The lower part of the shell of the transition connection mechanism is provided with a connecting plate, and the middle part of the connecting plate is provided with a threaded hole; the upper end of the grounding rod body is provided with a threaded rod; the grounding rod body and the transition connection mechanism are threadedly connected through the threaded rod and the threaded hole.

5. The grounding device for power outage maintenance according to claim 4, characterized in that: The lifting part is located in the shell and is rotatably connected to the upper end of the threaded rod.

6. The grounding device for power outage maintenance according to claim 5, characterized in that: The upper end of the threaded rod is a polished rod, a limiting groove is arranged on the polished rod along the circumference, and the lifting part is arranged in the limiting groove and is rotatably connected to the polished rod.

7. The grounding device for power outage maintenance according to claim 6, characterized in that: The blocking portion adopts a blocking plate, the lower end of the blocking plate is fixedly connected to the side of the lifting portion close to the hook head opening, and the upper end of the blocking plate is located in the guide through hole.

8. The grounding device for power outage maintenance according to claim 7, characterized in that: The blocking plate is an elastic metal blocking plate.

9. The grounding device for power outage maintenance according to claim 7, characterized in that: The overhanging end of the hook head is provided with a slot which is matched with the blocking plate.

10. The grounding device for power outage maintenance according to claim 1, characterized in that: The inner wall of the hook head is provided with a tongue movable cavity, the lower end of the tongue is hinged to the tongue movable cavity, a torsion spring is provided between the bottom wall of the tongue movable cavity and the middle part of the tongue, and the torsion spring drives the upper end of the tongue to move toward the middle part of the tongue movable cavity; the middle parts of the two tongues are correspondingly provided with conductive part limiting structures.

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