CN112310670B - Grounding device - Google Patents
Grounding device Download PDFInfo
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- CN112310670B CN112310670B CN202011150059.0A CN202011150059A CN112310670B CN 112310670 B CN112310670 B CN 112310670B CN 202011150059 A CN202011150059 A CN 202011150059A CN 112310670 B CN112310670 B CN 112310670B
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- connecting rod
- hole
- side wall
- shell
- grounding
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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
- H01R4/64—Connections between or with conductive parts having primarily a non-electric function, e.g. frame, casing, rail
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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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- Elimination Of Static Electricity (AREA)
- Electric Cable Installation (AREA)
Abstract
The invention relates to a grounding device, which comprises a device body and a connecting rod, wherein the device body is used for being connected with a grounding grid, the connecting rod is used for being connected with a tower, the device body comprises an outer shell and an inner shell, the inner shell is arranged in the outer shell, an installation cavity is formed between a first side wall of the outer shell and a second side wall of the inner shell at a spacing, the size of the cross section of the installation cavity is sequentially increased from one end close to the first side wall to one end close to the second side wall, the first side wall and the second side wall are respectively provided with a first through hole and a second through hole for penetrating the connecting rod, a plurality of steel balls are arranged in the installation cavity, the connecting rod can be selectively penetrated in the first through hole and the second through hole, the steel balls are positioned on the periphery of the connecting rod, the inner shell is elastically connected with the outer shell, and the inner shell drives the steel balls to abut against the walls of the connecting rod and the installation cavity. The structure has the characteristics of reliable connection and convenient disassembly.
Description
Technical Field
The invention relates to the technical field of power equipment, in particular to a grounding device.
Background
The transmission line is the life pulse of electric energy transmission, and the guarantee of the safe operation of the transmission line is an important part for guaranteeing the stable work of a power grid. Because the transmission line is exposed outdoors, the lightning trip becomes one of the highest accidents of the current transmission line trip rate, the grounding device is an important component of the transmission line, and the purpose of the grounding device is to lead the lightning into the ground through a grounding wire and a grounding grid so as to ensure the safety of the transmission line. In the maintenance work of transmission line, need carry out resistance measurement to earthing device, because traditional earthing device has the bolt and the shaft tower is fixed, the partial part of bolt and earthing device is owing to receive the rainwater corruption, the not hard up scheduling problem of corrosion and junction appears, dismantles the difficulty during maintenance, is not convenient for patrol and examine the operation.
Disclosure of Invention
The invention aims to provide a grounding device which is reliable in connection and convenient to detach.
In order to achieve the purpose, the invention adopts the following technical scheme:
the provided grounding device comprises a device body and a connecting rod, wherein the device body is used for being connected with a grounding grid, the connecting rod is used for being connected with a tower, the device body comprises an outer shell and an inner shell, the inner shell is arranged in the outer shell, an installation cavity is formed between a first side wall of the outer shell and a second side wall of the inner shell at intervals, the installation cavity is formed from one end close to the first side wall to one end close to the second side wall, the cross section size of the installation cavity is sequentially increased, the first side wall and the second side wall are respectively provided with a first through hole and a second through hole for penetrating the connecting rod, a plurality of steel balls are arranged in the installation cavity, the connecting rod can be selectively penetrated in the first through hole and the second through hole, the steel balls are positioned on the periphery of the connecting rod, and the inner shell is elastically connected with the outer shell, and the inner shell drives the steel balls to abut against the connecting rod and the wall of the mounting cavity.
Furthermore, the first through hole is a stepped hole, the stepped hole comprises a large hole and a small hole, the large hole is located on one side close to the tower, a connecting plate is sleeved on the connecting rod, the connecting rod is inserted into the small hole, and the connecting plate is inserted into the large hole.
Furthermore, a connecting seat is arranged on one side face, far away from the first through hole, of the outer shell, and is provided with a connecting hole, and the connecting rod is connected with the connecting hole in an inserting mode.
Further, a spring is arranged between the inner shell and the outer shell, and the spring can drive the inner shell to be close to or far away from the first side wall.
Furthermore, the number of the steel balls is at least three, and gaps for penetrating the connecting rods are formed among the at least three steel balls.
Further, the diameters of the first through hole and the second through hole are larger than the diameter of the connecting rod.
Further, when the connecting rod is separated from the device body, the inner shell can drive the steel ball to abut against the first side wall.
Further, the device body further comprises a protective shell, and the protective shell is sleeved on the periphery of the outer shell.
Furthermore, a waterproof layer is arranged on one side face, facing the pole tower, of the protective shell, and the waterproof layer is abutted to the pole tower.
The device body is electrically connected with the grounding grid through the grounding wire, and the grounding wire penetrates through the protective shell and is connected with the outer shell.
Compared with the prior art, the invention has the beneficial effects that:
according to the grounding device, the inner shell and the outer shell are elastically connected, the plurality of steel balls are arranged in the installation cavity between the inner shell and the outer shell, the connecting rod is inserted into the inner shell and the outer shell and is fixed through the plurality of steel balls, mechanical connection and electrical connection between the connecting rod and the device body are achieved, and the grounding device has the characteristics of being reliable in connection and convenient to detach.
Drawings
Fig. 1 is a schematic view of connection of the grounding device and a tower according to the embodiment.
Fig. 2 is a schematic structural view of the connecting rod of the embodiment.
Fig. 3 is a sectional view of the connection of the grounding device of the embodiment to a tower.
Fig. 4 is a sectional view of the device body of the embodiment.
In the figure:
1. a device body; 10. a protective shell; 11. an outer housing; 110. a first through hole; 111. a first side wall; 112. a third side wall; 12. an inner housing; 120. a second through hole; 121. a second side wall; 122. a mounting cavity; 13. a spring; 14. steel balls; 15. a waterproof layer; 16. a connecting seat; 2. a connecting rod; 21. a connecting plate; 3. a pole tower; 4. and a ground line.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings.
As shown in fig. 1 to 4, the grounding device provided by the invention comprises a device body 1 and a connecting rod 2, wherein the connecting rod 2 is a conductor, and the connecting rod 2 is installed on a tower 3 and is electrically connected with a conductive structure on the tower 3. The device body 1 is connected with the grounding grid through the grounding wire 4, and the device body 1 can be mechanically and electrically connected with the connecting rod 2, so that the conductive structure on the tower 3 is electrically connected with the grounding grid, and the grounding of the tower 3 is realized. Device body 1 includes outer shell 11 and interior casing 12, outer shell 11 and interior casing 12 are cavity structures, outer shell 11 has the first chamber that holds, interior casing 12 has the second and holds the chamber, interior casing 12 sets up in the first intracavity that holds of outer shell 11, one side that outer shell 11 is close to shaft tower 3 is first lateral wall 111, one side that interior casing 12 is close to shaft tower 3 is second lateral wall 121, interval and formation installation cavity 122 between first lateral wall 111 and the second lateral wall 121, be provided with a plurality of steel balls 14 in the installation cavity 122, steel ball 14 can freely roll in installation cavity 122. The cross section of the mounting cavity 122 increases from the end close to the first side wall 111 to the end close to the second side wall 121, that is, the mounting cavity 122 is in a cone shape, and the end close to the first side wall 111 is smaller and the end close to the second side wall 121 is larger. The diameter of the steel ball 14 is not smaller than the radius of the end of the mounting cavity 122 close to the first side wall 111. First through hole 110 for penetrating connecting rod 2 is provided on first side wall 111, second through hole 120 for penetrating connecting rod 2 is provided on second side wall 121, and first through hole 110, second through hole 120, inner housing 12 and outer housing 11 are all coaxial. The first and second through holes 110 and 120 each have a diameter greater than that of the connecting rod 2 to facilitate insertion of the connecting rod 2. When the connecting rod 2 is connected to the device body 1, the connecting rod 2 is inserted into the first through hole 110 and the second through hole 120, and the steel balls 14 are uniformly located on the periphery of the connecting rod 2. The inner housing 12 and the outer housing 11 are elastically connected by a spring 13, and the inner housing 12 is movable along the axial direction of the outer housing 11, so that the first side wall 111 and the second side wall 121 are far away from or close to each other, that is, the size of the mounting cavity 122 changes with the movement of the inner housing 12. The inner housing 12 can move towards one end close to the first side wall 111 under the action of elastic force to drive the steel ball 14 to move towards one side of the first side wall 111, so that the peripheral part of the steel ball 14 is simultaneously abutted against the cavity wall of the mounting cavity 122 and the connecting rod 2, and the connecting and fixing of the connecting rod 2 and the device body 1 are realized.
In this embodiment, referring to fig. 2, when the connecting rod 2 is connected to the device body 1, one end of the connecting rod 2, which is far away from the tower 3, sequentially passes through the first through hole 110 and the second through hole 120 and is inserted into the second accommodating cavity of the inner housing 12, and when the connecting rod 2 passes through the mounting cavity 122, the connecting rod 2 is located in a gap between the plurality of steel balls 14, and the steel balls 14 are abutted against the cavity walls of the connecting rod 2 and the mounting cavity 122. As the connecting rod 2 moves towards the second side wall 121, the end of the mounting cavity 122 close to the second side wall 121 is larger than the end close to the first side wall 111, so that the steel ball 14 rotates in the counterclockwise direction and moves towards the second side wall 121 along the cavity wall. The steel balls 14 drive the inner housing 12 to move to a side away from the first side wall 111 and compress the spring 13. When the connecting rod 2 is inserted to the set position, the connecting rod 2 stops moving, the spring 13 drives the inner shell 12 to move towards the first side wall 111, and the steel balls 14 are simultaneously abutted with the cavity wall of the mounting cavity 122 and the connecting rod 2. The connecting rod 2 is clamped by a plurality of steel balls 14, so that the connecting rod 2 is fixed. When the connecting rod 2 is separated from the device body 1, the magnet is used for absorbing the inner shell 12 at one end of the device body 1 departing from the first side wall 111, so that the inner shell 12 and the steel ball 14 move towards one end far away from the first side wall 111 under the action of the magnet, and the steel ball 14 can rotate between the connecting rod 2 and the cavity wall to pull out the connecting rod 2. This embodiment is through setting up elastic connection's interior casing 12 and shell body 11 to set up a plurality of steel balls 14 in the installation cavity 122 between interior casing 12 and shell body 11, connecting rod 2 inserts interior casing 12 and shell body 11 and fixes connecting rod 2 through a plurality of steel balls 14, realizes connecting rod 2 and device body 1's mechanical connection and electricity and is connected, has to connect reliably, dismantles convenient characteristics.
Specifically, connecting rod 2, steel ball 14 and shell body 11 are the conductor in this embodiment, and when device body 1 was connected with connecting rod 2, realized three's electric path through connecting rod 2 and shell body 11 respectively with the butt of steel ball 14, connecting rod 2 was connected with the electrically conductive structure electricity on the shaft tower 3, and shell body 11 is connected with the ground net electricity through earth connection 4, and then realized that electrically conductive structure on the shaft tower 3 is connected with the ground net electricity.
Specifically, the first through hole 110 is a stepped hole, the stepped hole includes a large hole and a small hole, the large hole is located at one side close to the tower 3, the connecting rod 2 is sleeved with the connecting plate 21, the connecting rod 2 is inserted into the small hole, and the connecting plate 21 is inserted into the large hole. In this embodiment, connecting plate 21 and connecting rod 2 integrated into one piece, connecting plate 21 are the plectane structure, and the diameter of connecting plate 21 is the same with macroporous diameter, and the thickness of connecting plate 21 is the same with macroporous degree of depth, and after connecting rod 2 inserted the aperture, connecting plate 21 can insert in the macropore and with macroporous pore wall butt. The electric path between the connecting rod 2 and the device body 1 is realized through the butt joint of the connecting plate 21 and the large hole. It can be understood that, because the steel ball 14 is in point contact with the outer shell 11 or the connecting rod 2, the contact area between the steel ball and the outer shell is small, and local current is easily too large when the circuit is conducted, and meanwhile, because the steel ball 14 can roll in the mounting cavity 122, poor contact is easily caused, and grounding is further affected. In the present embodiment, the first through hole 110 is set as a stepped hole, the connecting plate 21 is disposed on the connecting rod 2, and the connecting plate 21 is inserted into the large hole, so as to increase the contact surface between the connecting rod 2 and the outer housing 11, and ensure the electrical connection therebetween.
Specifically, a side surface of the outer shell 11 away from the first through hole 110 is provided with a connecting seat 16, the connecting seat 16 is provided with a connecting hole, and the connecting rod 2 is inserted into the connecting hole. In this embodiment, connecting seat 16 is installed in the first accommodating cavity of outer housing 11, connecting seat 16 is coaxial with first through hole 110, and connecting seat 16 is located on a side wall of outer housing 11 opposite to first side wall 111. When the connecting rod 2 is connected with the device body 1, the connecting rod 2 sequentially passes through the first through hole 110 and the second through hole 120, and one end, far away from the tower 3, of the connecting rod 2 is connected with the connecting hole in an inserting mode. This structure can further increase the contact area of the connecting rod 2 with the outer housing 11 to ensure electrical connection therebetween.
Specifically, inner housing 12 has a second accommodating cavity with an opening at one end, the opening of the second accommodating cavity faces away from first sidewall 111, spring 13 is installed in the second accommodating cavity, one end of spring 13 is connected with third sidewall 112 of the first accommodating cavity, and third sidewall 112 is opposite to first sidewall 111. When the connecting rod 2 is connected to the device body 1, the connecting rod 2 moves from the first sidewall 111 to the third sidewall 112, and under the action of friction between the steel ball 14 and the connecting rod 2, the steel ball 14 can push the inner housing 12 to move toward the third sidewall 112, and the spring 13 is compressed. After the connecting rod 2 stops moving, the spring 13 drives the inner housing 12 to move towards the first side wall 111 under the action of the elastic force, and the steel ball 14 is abutted against the connecting rod 2 and the wall of the mounting cavity 122 to clamp the connecting rod 2.
Specifically, the number of the steel balls 14 is at least three, and a gap for penetrating the connecting rod 2 is formed between the at least three steel balls 14. It will be appreciated that three and more than three steel balls 14 are sequentially linked and drawn together, and a gap formed in the middle thereof is used for the insertion of the connecting rod 2. Meanwhile, one side of the steel ball 14, which faces away from the connecting rod 2, is abutted against the cavity wall of the mounting cavity 122, so that the connecting rod 2 is clamped between the steel balls 14. Meanwhile, a groove is formed in the wall of the mounting cavity 122, one end, away from the connecting rod 2, of the steel ball 14 is inserted into the groove, and the steel ball 14 can roll along the length direction of the groove. This structure is favorable to locating the steel ball 14 through the groove, avoids the steel ball 14 to rotate along the circumference of connecting rod 2. Because the steel ball 14 is connected with the groove, the contact area between the steel ball 14 and the outer shell 11 is increased, and the electric connection between the steel ball 14 and the outer shell 11 is ensured.
Specifically, when the connecting rod 2 is separated from the apparatus body 1, the inner housing 12 can drive the steel ball 14 into abutment with the first side wall 111. It can be understood that the connecting rod 2 is inserted into the gap between the steel balls 14, and in order to facilitate the insertion of the connecting rod 2, the gap between the steel balls 14 is required to be opposite to the first through hole 110. Since the connecting rod 2 is inserted into the apparatus body 1 in the horizontal direction, the plurality of steel balls 14 are distributed in the vertical direction. The installation cavity 122 is the toper, and first lateral wall 111 is located the tip of installation cavity 122, through interior casing 12 drive steel ball 14 and first lateral wall 111 butt, is favorable to making a plurality of steel balls 14 to be in the state of drawing close, makes the clearance between a plurality of steel balls 14 just right with first through-hole 110, makes things convenient for connecting rod 2 to insert.
Specifically, device body 1 still includes protective housing 10, and protective housing 10 is made by rubber materials, and the outside of shell body 11 is located to protective housing 10 cover, and protective housing 10 is provided with the hole of dodging that is used for dodging connecting rod 2 towards the one end of shaft tower 3, and the hole of dodging is the same with first through-hole 110 size. This structure can avoid shell body 11 to receive the rainwater corruption, improves life.
Specifically, for further promoting the waterproof performance of device body 1, protective housing 10 is provided with waterproof layer 15 towards one side of shaft tower 3, and waterproof layer 15 and shaft tower 3 butt. It can be understood that, after the device body 1 is connected with the connecting rod 2, a gap is formed between the device body 1 and the tower 3, and rainwater can enter the device body 1 through the gap to cause the corrosion of metal parts in the device body 1. Set up waterproof layer 15 and can avoid the rainwater to get into, promote waterproof performance. In this embodiment, the waterproof layer 15 may be a silica gel sealing ring.
Specifically, the device body 1 is electrically connected with a grounding grid through a grounding wire 4, one end of the grounding wire 4 is installed on the grounding grid, and the other end of the grounding wire 4 penetrates through the protective shell 10 and is connected with the outer shell 11, so that the outer shell 11 is electrically connected with the grounding grid.
The remarkable effects of the embodiment are as follows: through setting up elastic connection's interior casing 12 and shell body 11 to set up a plurality of steel balls 14 in the installation cavity 122 between interior casing 12 and shell body 11, connecting rod 2 inserts interior casing 12 and shell body 11 and fixes connecting rod 2 through a plurality of steel balls 14, realizes connecting rod 2 and device body 1's mechanical connection and electricity and is connected, has to be connected reliably, dismantles convenient characteristics.
The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.
Claims (10)
1. A grounding device is characterized by comprising a device body and a connecting rod, wherein the device body is used for being connected with a grounding grid, the connecting rod is used for being connected with a tower, the device body comprises an outer shell and an inner shell, the inner shell is arranged inside the outer shell, one side, close to the tower, of the outer shell is a first side wall, one side, close to the tower, of the inner shell is a second side wall, the first side wall of the outer shell and the second side wall of the inner shell are separated to form an installation cavity, the size of the cross section of the installation cavity is sequentially increased from one end, close to the first side wall, to one end, close to the second side wall, of the outer shell, the first through hole and the second through hole are respectively formed in the first side wall and the second side wall, a plurality of steel balls are arranged in the installation cavity, the connecting rod is arranged in the first through hole and the second through hole, and a plurality of the steel balls are positioned on the periphery of the connecting rod, the inner shell is elastically connected with the outer shell through a spring, and the inner shell drives the steel balls to abut against the connecting rod and the wall of the mounting cavity.
2. The grounding device of claim 1, wherein the first through hole is a stepped hole, the stepped hole comprises a large hole and a small hole, the large hole is located at one side close to the tower, a connecting plate is sleeved on the connecting rod, the connecting rod is inserted into the small hole, and the connecting plate is inserted into the large hole.
3. The grounding device of claim 2, wherein a connecting seat is arranged on a side surface of the outer shell body away from the first through hole, the connecting seat is provided with a connecting hole, and the connecting rod is inserted into the connecting hole.
4. The grounding device of claim 1, wherein a spring is disposed between the inner housing and the outer housing, the spring being capable of driving the inner housing toward or away from the first sidewall.
5. The grounding device of claim 1, wherein the number of the steel balls is at least three, and a gap for passing the connecting rod is formed between at least three steel balls.
6. The grounding device of claim 1, wherein the first through hole and the second through hole each have a diameter greater than a diameter of the connecting rod.
7. The grounding device of claim 1, wherein the inner housing is capable of driving the steel ball into abutment with the first sidewall when the connecting rod is separated from the device body.
8. The grounding device of claim 1, wherein the device body further comprises a protective shell, and the protective shell is sleeved on the periphery of the outer shell.
9. The grounding device of claim 8, wherein a waterproof layer is arranged on one side surface of the protective shell facing the tower, and the waterproof layer is abutted against the tower.
10. The grounding device of claim 8, further comprising a grounding wire, wherein the device body and the grounding grid are electrically connected through the grounding wire, and the grounding wire passes through the protective shell and is connected with the outer shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011150059.0A CN112310670B (en) | 2020-10-23 | 2020-10-23 | Grounding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011150059.0A CN112310670B (en) | 2020-10-23 | 2020-10-23 | Grounding device |
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| CN112310670A CN112310670A (en) | 2021-02-02 |
| CN112310670B true CN112310670B (en) | 2022-03-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011150059.0A Active CN112310670B (en) | 2020-10-23 | 2020-10-23 | Grounding device |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113144629A (en) * | 2021-03-30 | 2021-07-23 | 中山市金三模特道具有限公司 | Quick-dismantling doll skeleton |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4376559A (en) * | 1980-11-10 | 1983-03-15 | Sgl Industries, Inc. | Duplex grounding |
| US4613191A (en) * | 1985-04-15 | 1986-09-23 | E. I. Du Pont De Nemours And Company | Grounding connector |
| CN1988264A (en) * | 2005-12-19 | 2007-06-27 | 阿尔卡特公司 | Grounding device with plastic housing |
| CN208062268U (en) * | 2018-05-03 | 2018-11-06 | 重庆水利电力职业技术学院 | Square grounding device for power pole tower |
| CN209487793U (en) * | 2019-04-13 | 2019-10-11 | 青岛海纳能源环保科技开发有限公司 | A kind of Electro Sorb high-voltage connecting device |
| CN211295403U (en) * | 2020-03-11 | 2020-08-18 | 甘肃兰金民用爆炸高新技术有限责任公司 | Electrical equipment grounding device mounting structure |
-
2020
- 2020-10-23 CN CN202011150059.0A patent/CN112310670B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4376559A (en) * | 1980-11-10 | 1983-03-15 | Sgl Industries, Inc. | Duplex grounding |
| US4613191A (en) * | 1985-04-15 | 1986-09-23 | E. I. Du Pont De Nemours And Company | Grounding connector |
| CN1988264A (en) * | 2005-12-19 | 2007-06-27 | 阿尔卡特公司 | Grounding device with plastic housing |
| CN208062268U (en) * | 2018-05-03 | 2018-11-06 | 重庆水利电力职业技术学院 | Square grounding device for power pole tower |
| CN209487793U (en) * | 2019-04-13 | 2019-10-11 | 青岛海纳能源环保科技开发有限公司 | A kind of Electro Sorb high-voltage connecting device |
| CN211295403U (en) * | 2020-03-11 | 2020-08-18 | 甘肃兰金民用爆炸高新技术有限责任公司 | Electrical equipment grounding device mounting structure |
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