CN111653913A - Convenient installation device of basic station vertical grounding body - Google Patents
Convenient installation device of basic station vertical grounding body Download PDFInfo
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- CN111653913A CN111653913A CN202010510102.3A CN202010510102A CN111653913A CN 111653913 A CN111653913 A CN 111653913A CN 202010510102 A CN202010510102 A CN 202010510102A CN 111653913 A CN111653913 A CN 111653913A
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- 238000009434 installation Methods 0.000 title claims abstract description 17
- 229910000831 Steel Inorganic materials 0.000 claims description 25
- 239000010959 steel Substances 0.000 claims description 25
- 238000000034 method Methods 0.000 abstract description 8
- 230000033001 locomotion Effects 0.000 abstract description 4
- 210000002414 leg Anatomy 0.000 description 17
- 239000002689 soil Substances 0.000 description 10
- 238000010276 construction Methods 0.000 description 6
- 238000004891 communication Methods 0.000 description 4
- 238000010295 mobile communication Methods 0.000 description 4
- 230000006978 adaptation Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- 238000009440 infrastructure construction Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
- H01R4/66—Connections with the terrestrial mass, e.g. earth plate, earth pin
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
- Manufacturing Of Electrical Connectors (AREA)
Abstract
The invention provides a convenient installation device for a vertical grounding body of a base station, which comprises a barrel, a hammer head, a sleeve, a plurality of connecting rods, a balancing weight, a sleeve, a grounding rod, a plurality of guide rods, a guide block vertically matched with the guide rods in a sliding manner, a first spring, at least three supporting legs and a linkage ring. The spring of both sides in the barrel one be used for utilizing the partial strength of the last whereabouts hammering to come extension spring and pull the barrel to the artifical pulling down force of the cooperation handle of a take the altitude after effectively hammering of whereabouts once more, so the quick hammering earth bar of reciprocating motion reaches appointed degree of depth, compares traditional mounting means, can save the manual work after this technique and improve hammer strength labour saving and time saving at every turn.
Description
Technical Field
The invention relates to the field of base station infrastructure construction in mobile communication equipment, in particular to a convenient installation device for a vertical grounding body of a base station.
Background
In recent years, the requirement of 4G rapid development is benefited, and the number of base stations of various operators in China shows a stable increasing trend in the aspect of base station construction. With the issuance of 5G license plates by the ministry of industry and communications in china, the construction of 5G base stations in china begins to accelerate, and the number of constructions is increasing continuously.
In order to prevent the mobile communication base station from being damaged by thunder, ensure the safety and normal work of equipment in the mobile communication base station and ensure the safety of workers in structures and stations, the Ministry of industry and communications specializes the number of the lightning protection and grounding design specification of the mobile communication base station, YD5068-98 requires as follows: 4.2.1 the grounding body is made of hot-dip galvanized steel, and the specification requirements are as follows: the diameter of the steel pipe is 50mm, and the wall thickness is not less than 3.5 mm. The angle steel is not less than 50mm x 5 mm. The flat steel should not be less than 40mm χ 4 mm. The length of the vertical grounding bodies is preferably 1.5-2.5m, and the distance between the vertical grounding bodies is 1.5-2 times of the length of the vertical grounding bodies. If the soil is in a place with uneven resistivity, the resistivity of the soil at the lower layer is low, and the soil can be properly lengthened. When the vertical grounding body is difficult to bury, a plurality of annular horizontal grounding bodies can be arranged, the distance between the annular horizontal grounding bodies is 1-1.5m, and the annular horizontal grounding bodies are welded and communicated with each other every 3-5 m. 4.2.5 the upper end of the grounding body should not be less than 0.7m from the ground, and in cold regions the grounding body should be buried under the frozen soil layer.
The installation of the grounding body is an essential link in the construction of the base station, because the site selection of the communication base station requires the site selection of the base station to be far away from roads, railways, river channels, high-voltage lines, airports, gas stations and the like as far as possible according to the national requirements, the requirements of the national and local laws and regulations on various isolation belts are fully known, various control lines and the like are far away as far as possible, signal blind areas and other reasons are filled, the grounding body is often built in remote areas or mountain tops, and large-scale equipment is not easy to carry. At present, the traditional method is that two persons cooperate with one person to hold a rod (vertical grounding body) and one wheel hammer to manually hammer the grounding rod into the soil layer. On one hand, the mode wastes time and labor and is low in efficiency, on the other hand, personal safety hazards easily occur due to the matching relation, and on the other hand, the ground rod is easily inclined due to the hand-held rod to cause the ground rod to be incapable of vertically entering the ground. Therefore, how to safely, effectively and quickly install the vertical grounding body becomes a difficult problem concerned by construction personnel in the industry.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides the convenient installation device for the vertical grounding body during the communication base station construction, which is safe, efficient, time-saving and labor-saving, has a novel and simple structure, and adopts a relatively simple structure and a skillful relative action to quickly and effectively install the vertical grounding body of the base station.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: a convenient installation device for a vertical grounding body of a base station comprises a barrel body, a hammer head, a sleeve, a plurality of connecting rods, a balancing weight, a sleeve, a grounding rod, a plurality of guide rods, a guide block, a first spring, at least three supporting legs and a linkage ring, wherein the guide block is vertically matched with the guide rods in a sliding manner, the barrel body is hollow and is communicated up and down, the hammer head, the connecting rods and the sleeve are sequentially connected from top to bottom and are positioned in the hollow part of the barrel body, the connecting rods are distributed at equal angles around the center of the barrel body, the top of the hammer head is exposed out of the top of the barrel body, the bottom of the sleeve is exposed out of the bottom of the barrel body, the balancing weight is detachably connected at the center of the top of the hammer head through threads, the sleeve is detachably connected at the center of the bottom of the sleeve through threads, a die slot for, the guide block on every guide bar links to each other with the connecting rod one by one, the spring suit is on the guide bar, and the upper and lower both ends of spring one link to each other with top, the guide block of barrel inner chamber respectively, at least three spout has vertically been seted up on the outer wall of barrel, and is three the spout is around angular distribution such as barrel center, the vertical slide bar that is provided with of spout, vertical slip adaptation has the slider on the spout, the slider sliding sleeve is on the slide bar, the cover has spring two on the slide bar, spring two is located the top of slider, and a plurality of sliders link to each other with the inner circle of linkage ring, and is three the supporting legs articulate on the linkage ring and around angular distribution such as barrel center.
Preferably, the number of the connecting rods, the guide rods, the sliding rods and the supporting legs is four.
Preferably, a fixing hole is formed in the side portion of the sleeve, a fixing bolt is connected to the fixing hole in a threaded mode, and the fixing bolt can fix the grounding rod on the sleeve.
Preferably, the ground rod is circular steel pipe, angle steel or band steel, the sleeve pipe has three, and its bottom is seted up the die cavity with steel pipe, angle steel, band steel looks adaptation respectively.
Preferably, arc-shaped handles are symmetrically arranged on two sides of the outer part of the cylinder body.
Preferably, a level gauge is arranged on the cylinder.
(III) advantageous effects
The invention provides a convenient installation device for a vertical grounding body of a base station. The method has the following beneficial effects:
1. this convenient installation device of perpendicular grounding body of basic station, the spring of both sides in the barrel comes extension spring to draw the barrel to the take the altitude (promptly the counterweight piece exposes the top of barrel completely) in the lump with partial strength of last whereabouts hammering and can fall effective hammering once more after the artifical pulling force of cooperation handle, the quick hammering earth bar of reciprocating motion reachs appointed degree of depth so, contrast traditional mounting means, can save the manual work after this technique and improve hammer strength labour saving and time saving at every turn, guaranteed the accuracy and the validity of every hammering after having the barrel simultaneously, avoided traditional mounting means hammer to beat and cause the incident after deviating from normal.
2. This convenient installation device of basic station vertical grounding body sets up a plurality of supporting legss in the periphery of barrel, and the cooperation spirit level is perpendicular down with the barrel, and need not the manual work and aim at, and the workman only needs to stabilize the barrel and can guarantee that the barrel is perpendicular, compares in traditional hand-held, has improved stability, the accuracy that the earth bar goes into the ground perpendicularly. The supporting legs can ascend along with the descending of the cylinder body and the grounding rod, and the supporting legs can be always supported at the same height and cannot descend along with the grounding rod.
Drawings
FIG. 1 is an isometric view of a structure of the present invention;
FIG. 2 is a front cross-sectional view of the structure of the present invention;
fig. 3 is an expanded view of the supporting leg of the present invention.
In the figure: the device comprises a barrel 1, a hammer 2, a sleeve 3, a connecting rod 4, a balancing weight 5, a sleeve 6, a grounding rod 7, a guide rod 8, a guide block 9, a spring I10, a handle 11, a fixing bolt 12, a supporting leg 13, a sliding chute 14, a sliding block 15, a sliding rod 16, a spring II 17, a linkage ring 18 and a level 19.
Detailed Description
The embodiment of the invention provides a convenient installation device for a vertical grounding body of a base station, which comprises a cylinder body 1, a hammer 2, a sleeve 3, a plurality of connecting rods 4, a balancing weight 5, a sleeve 6, a grounding rod 7, a plurality of guide rods 8, a guide block 9 vertically matched with the guide rods 8 in a sliding manner, a first spring 10, at least three supporting legs 13 and a linkage ring 18, as shown in figures 1-3.
The barrel 1 is hollow and runs through from top to bottom, the hammer 2, the connecting rods 4 and the sleeve 3 are sequentially connected from top to bottom and are located in the hollow position of the barrel 1, the connecting rods 4 are distributed around the center of the barrel 1 at equal angles, the top of the hammer 2 is exposed out of the top of the barrel 1, and the bottom of the sleeve 3 is exposed out of the bottom of the barrel 1.
The detachable threaded connection of balancing weight 5 is in the center department at 2 tops of tup, and different soil hardness are being adapted to in the special balancing weight 5 of loading according to the difference of soil property. Install the high strength balancing weight 5 of certain weight, guarantee the dynamics of whereabouts hammering at every turn.
The sleeve 6 is detachably connected to the center of the bottom of the sleeve 3 through threads, and a die cavity for inserting the grounding rod 7 is formed in the bottom of the sleeve 6. The grounding rod 7 comprises three types of round steel pipes, angle steel and flat steel, namely an L-shaped standard angle steel grounding body; the circular steel tube grounding body is thin at the upper part and thick at the lower part and has different diameters; the I-type standard flat steel can be inserted into the grounding rod of the special grounding body for the national standard base station with different specifications. The number of the sleeves 6 is three, and the bottoms of the sleeves are respectively provided with a die cavity matched with the steel pipe, the angle steel and the flat steel.
A plurality of vertical settings of guide bar 8 are in barrel 1 and around the angular distribution such as barrel 1 center, and guide block 9 on every guide bar 8 links to each other with connecting rod 4 one by one, and spring 10 cover is on guide bar 8, and the upper and lower both ends of spring 10 link to each other with top, the guide block 9 of barrel 1 inner chamber respectively, and the removable different length of spring 10 and elastic spring can form thrust reverser and damping to different soil layer hardness.
Arc-shaped handles 11 are symmetrically arranged on two sides of the outer part of the barrel body 1. Handle 11 is arc welding in 1 both sides of barrel for circular steel pipe, is convenient for grip downwards and has an effect and keep the 7 vertical degrees of earth bar, and the level is kept at handle 11 top, is convenient for directly push down the quick earth bar 7 of inserting in the horizontal handle department of this device under the soft soil layer condition.
At least three sliding grooves 14 are vertically formed in the outer wall of the barrel 1, the three sliding grooves 14 are distributed around the center of the barrel 1 at equal angles, sliding rods 16 are vertically arranged on the sliding grooves 14, sliding blocks 15 are vertically matched on the sliding grooves 14 in a sliding mode, the sliding blocks 15 are sleeved on the sliding rods 16 in a sliding mode, springs 17 are sleeved on the sliding rods 16, the springs 17 are located above the sliding blocks 15, the sliding blocks 15 are connected with the inner ring of a linkage ring 18, and three supporting legs 13 are hinged to the linkage ring 18 and distributed around the center of the barrel 1 at equal angles. A level gauge 19 is arranged on the cylinder 1.
The diameter of the first spring 10 is larger than that of the second spring 17, that is, the tension of the first spring 10 is larger than that of the second spring 17. When the first spring 10 pushes the cylinder 1 reversely, the slide block 15 can press the second spring 17.
The supporting legs 13 are arranged on the periphery of the barrel 1, the barrel 1 is vertically downward through the matching level gauge 19, manual alignment is not needed, a worker only needs to stabilize the barrel 1 to ensure that the barrel 1 is vertical, and compared with a traditional hand-held type, the stability and accuracy of the grounding rod 7 entering the ground vertically are improved. The supporting legs 13 can rise along with the downward movement of the cylinder 1 and the grounding rod 7, and the supporting legs 13 can be always supported at the same height and cannot move downward along with the grounding rod 7.
The number of the connecting rods 4, the guide rods 8, the sliding rods 16 and the supporting feet 13 is four. Four devices are arranged to make the device more stable and axially symmetrical.
The lateral part of the sleeve 6 is provided with a fixing hole, the fixing hole is connected with a fixing bolt 12 through threads, and the fixing bolt 12 can fix the grounding rod 7 on the sleeve 6. After the grounding rod 7 is inserted on the sleeve 6, the fixing bolt 12 is screwed on to prevent the grounding rod 7 from falling off from the sleeve 6 downwards in the hammering process.
The working principle is as follows: the method comprises the following steps: according to the soil hardness, a proper balancing weight 5 is installed, a proper sleeve 6 is installed, a grounding rod 7 is inserted into the bottom of the sleeve 6, and a fixing bolt 12 is screwed up, so that the grounding rod 7 is fixed on the sleeve 6; step two: the supporting legs 13 are unfolded outwards, and the unfolding amplitude of the supporting legs 13 is adjusted through a level gauge 19 according to the actual terrain, so that the supporting legs are adjusted to be vertically downward of the barrel 1; step three: one person holds the handle 11 by hand, and the other person carries out wheel hammer on the balancing weight 5; step four: the counterweight 5, the hammer 2, the connecting rod 4, the sleeve 6 and the ground rod 7 vertically descend, and the connecting rod 4 drives the guide block 9 to stretch the spring I10 at the top of the guide block; step five: the grounding rod 7 is sunk underground to fix the position of the grounding rod to form a fixed point, a worker loosens the handle 11, the spring I10 is compressed and reset to drive the barrel body 1 to descend, and the worker is matched to press down through the handle 11 to enable most of the balancing weight 5 to be exposed out of the top of the barrel body 1; in the descending process of the cylinder body 1, the linkage ring 18 drives the sliding block 15 to compress the second spring 17, so that the linkage ring 18 is always kept at the same height, the position of the supporting leg 13 is not changed, and the stable verticality is continuously provided for the cylinder body 1.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides a convenient installation device of basic station vertical grounding body which characterized in that: comprises a cylinder body (1), a hammer head (2), a sleeve (3), a plurality of connecting rods (4), a balancing weight (5), a sleeve (6), a grounding rod (7), a plurality of guide rods (8), a guide block (9) vertically matched with the guide rods (8) in a sliding manner, a first spring (10), at least three supporting legs (13) and a linkage ring (18), wherein the cylinder body (1) is hollow and is communicated from top to bottom, the hammer head (2), the connecting rods (4) and the sleeve (3) are sequentially connected from top to bottom and are positioned in the hollow part of the cylinder body (1), the connecting rods (4) are distributed around the center of the cylinder body (1) at equal angles, the top of the hammer head (2) is exposed out of the top of the cylinder body (1), the bottom of the sleeve (3) is exposed out of the bottom of the cylinder body (1), the balancing weight (5) is detachably connected to the center of the top of the hammer head (2) in a threaded manner, the bottom of the sleeve (6) is provided with a die cavity for inserting a grounding rod (7), a plurality of guide rods (8) are vertically arranged in the barrel (1) and distributed at equal angles around the center of the barrel (1), guide blocks (9) on each guide rod (8) are connected with connecting rods (4) one by one, a first spring (10) is sleeved on each guide rod (8), the upper end and the lower end of the first spring (10) are respectively connected with the top of the inner cavity of the barrel (1) and the guide blocks (9), the outer wall of the barrel (1) is vertically provided with at least three sliding grooves (14), the three sliding grooves (14) are distributed at equal angles around the center of the barrel (1), the sliding grooves (14) are vertically provided with sliding rods (16), the sliding blocks (15) are matched with the sliding grooves (14) in a sliding mode, the sliding rods (16) are sleeved with second springs (17), the second spring (17) is located above the sliding blocks (15), the sliding blocks (15) are connected with the inner ring of the linkage ring (18), and the supporting legs (13) are hinged to the linkage ring (18) and distributed around the center of the barrel body (1) at equal angles.
2. The convenient installation device of the vertical grounding body of the base station as claimed in claim 1, wherein: the number of the connecting rods (4), the number of the guide rods (8), the number of the sliding rods (16) and the number of the supporting legs (13) are four.
3. The convenient installation device of the vertical grounding body of the base station as claimed in claim 1, wherein: the side part of the sleeve (6) is provided with a fixing hole, the fixing hole is connected with a fixing bolt (12) in a threaded manner, and the fixing bolt (12) can fix the grounding rod (7) on the sleeve (6).
4. The convenient installation device of the vertical grounding body of the base station as claimed in claim 1, wherein: the ground rod (7) is a round steel pipe, an angle steel or a flat steel, the number of the sleeves (6) is three, and the bottoms of the sleeves are respectively provided with a die cavity matched with the steel pipe, the angle steel and the flat steel.
5. The convenient installation device of the vertical grounding body of the base station as claimed in claim 1, wherein: arc-shaped handles (11) are symmetrically arranged on two sides of the outer part of the barrel body (1).
6. The convenient installation device of the vertical grounding body of the base station as claimed in claim 1, wherein: a level gauge (19) is arranged on the cylinder body (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010510102.3A CN111653913B (en) | 2020-06-08 | 2020-06-08 | Convenient installation device of basic station vertical grounding body |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010510102.3A CN111653913B (en) | 2020-06-08 | 2020-06-08 | Convenient installation device of basic station vertical grounding body |
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| CN111653913A true CN111653913A (en) | 2020-09-11 |
| CN111653913B CN111653913B (en) | 2021-06-15 |
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| CN202010510102.3A Expired - Fee Related CN111653913B (en) | 2020-06-08 | 2020-06-08 | Convenient installation device of basic station vertical grounding body |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112436352A (en) * | 2020-10-09 | 2021-03-02 | 广西电网有限责任公司来宾兴宾供电局 | Novel 10kV grounding wire installation method |
| CN113131310A (en) * | 2021-04-25 | 2021-07-16 | 贵州电网有限责任公司 | Grounding pin installation device |
| CN116908550A (en) * | 2023-09-13 | 2023-10-20 | 山东省阳信根深电气有限公司 | Grounding condition safety detection device and method for distribution box |
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| CN102723618A (en) * | 2012-06-14 | 2012-10-10 | 株洲普天中普防雷科技有限公司 | Lightning protection grounding rod special for mobile communication vehicle and assembling and using method thereof |
| CN107123918A (en) * | 2017-04-06 | 2017-09-01 | 国网山东省电力公司淄博供电公司 | A kind of insertion extracting apparatus of drop bar |
| WO2018013742A1 (en) * | 2016-07-13 | 2018-01-18 | Hubbell Incorporated | Electrical connection devices with welded wire leads |
| CN109935979A (en) * | 2017-12-19 | 2019-06-25 | 焦红 | The lightning-proof grounding body of function admirable |
| CN209133818U (en) * | 2019-01-21 | 2019-07-19 | 中铁上海工程局集团有限公司 | A kind of high-speed railway subgrade mast foundation for overhead contact wire system ground connection auxiliary tool |
| CN210016158U (en) * | 2019-05-30 | 2020-02-04 | 广东电网有限责任公司 | Winding and arranging auxiliary tool for grounding wire of transformer substation |
-
2020
- 2020-06-08 CN CN202010510102.3A patent/CN111653913B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102723618A (en) * | 2012-06-14 | 2012-10-10 | 株洲普天中普防雷科技有限公司 | Lightning protection grounding rod special for mobile communication vehicle and assembling and using method thereof |
| WO2018013742A1 (en) * | 2016-07-13 | 2018-01-18 | Hubbell Incorporated | Electrical connection devices with welded wire leads |
| CN107123918A (en) * | 2017-04-06 | 2017-09-01 | 国网山东省电力公司淄博供电公司 | A kind of insertion extracting apparatus of drop bar |
| CN109935979A (en) * | 2017-12-19 | 2019-06-25 | 焦红 | The lightning-proof grounding body of function admirable |
| CN209133818U (en) * | 2019-01-21 | 2019-07-19 | 中铁上海工程局集团有限公司 | A kind of high-speed railway subgrade mast foundation for overhead contact wire system ground connection auxiliary tool |
| CN210016158U (en) * | 2019-05-30 | 2020-02-04 | 广东电网有限责任公司 | Winding and arranging auxiliary tool for grounding wire of transformer substation |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112436352A (en) * | 2020-10-09 | 2021-03-02 | 广西电网有限责任公司来宾兴宾供电局 | Novel 10kV grounding wire installation method |
| CN113131310A (en) * | 2021-04-25 | 2021-07-16 | 贵州电网有限责任公司 | Grounding pin installation device |
| CN116908550A (en) * | 2023-09-13 | 2023-10-20 | 山东省阳信根深电气有限公司 | Grounding condition safety detection device and method for distribution box |
| CN116908550B (en) * | 2023-09-13 | 2023-11-21 | 山东省阳信根深电气有限公司 | Grounding condition safety detection device and method for distribution box |
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| CN111653913B (en) | 2021-06-15 |
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Granted publication date: 20210615 |