CN108110584B - Following type grounding device - Google Patents
Following type grounding device Download PDFInfo
- Publication number
- CN108110584B CN108110584B CN201810073729.XA CN201810073729A CN108110584B CN 108110584 B CN108110584 B CN 108110584B CN 201810073729 A CN201810073729 A CN 201810073729A CN 108110584 B CN108110584 B CN 108110584B
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- grounding
- assembly
- limit switch
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- rod
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- 230000009467 reduction Effects 0.000 claims abstract description 10
- 239000003638 chemical reducing agent Substances 0.000 claims description 24
- 230000008878 coupling Effects 0.000 claims description 8
- 238000010168 coupling process Methods 0.000 claims description 8
- 238000005859 coupling reaction Methods 0.000 claims description 8
- 230000007704 transition Effects 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 10
- 230000009471 action Effects 0.000 description 7
- 230000008901 benefit Effects 0.000 description 4
- 230000003137 locomotive effect Effects 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M1/00—Power supply lines for contact with collector on vehicle
- B60M1/02—Details
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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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R11/00—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts
- H01R11/11—End pieces or tapping pieces for wires, supported by the wire and for facilitating electrical connection to some other wire, terminal or conductive member
- H01R11/12—End pieces terminating in an eye, hook, or fork
- H01R11/14—End pieces terminating in an eye, hook, or fork the hook being adapted for hanging on overhead or other suspended lines, e.g. hot line clamp
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/02—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Patch Boards (AREA)
- Elimination Of Static Electricity (AREA)
Abstract
The invention relates to the technical field of rail transit, in particular to a following type grounding device, which comprises: a bracket; a deceleration assembly mounted on the support; the grounding component is connected to the output end of the speed reduction component and can rotate along with the rotation of the output end of the speed reduction component; the elastic following component is connected with the support and the grounding component and can keep the grounding component in a contact state with the contact net all the time; the limiting assembly and the speed reducing assembly are electrically connected to the control system, and the control system can control the speed reducing assembly to be started and can control the speed reducing assembly to stop running according to signals sent by the limiting assembly. The following type grounding device provided by the invention realizes automatic net hanging and automatic net picking of the grounding assembly, omits the process of manually operating the grounding rod, thereby avoiding the potential safety hazard existing in manual operation and reducing the labor intensity of operators; the elastic following component is arranged to ensure that the grounding component can always reliably follow the contact net, so that the grounding performance is ensured.
Description
Technical Field
The invention relates to the technical field of rail transit, in particular to a following type grounding device.
Background
The electrified railway contact network is usually provided with high voltage, so that before the operation of the contact network, such as overhaul, equipment maintenance, roof overhaul and maintenance on an electric locomotive and the like, reliable grounding of the contact network is a necessary condition for ensuring safe operation under the condition of no electricity, and at present, a grounding wire is hung or detached by adopting a mode of manually operating a grounding rod after the contact network in a machine section or a motor train overhaul warehouse is powered off, namely, after a contact network disconnecting switch is switched off, a related operator holds the grounding insulating rod by hand and lifts the grounding rod to the contact network, and a grounding hook is hung on the contact network, so that the purpose of grounding related electrical equipment is realized; when the maintenance is completed, an operator still needs to manually remove the grounding hook from the contact net.
The traditional operation mode is completely dependent on manpower in the whole process, has high labor intensity and low working efficiency, greatly restricts the development of the electric locomotive servicing operation to the mechanized, automatic and automatic control direction of the system, has the condition of human errors such as missed hanging and missed dismantling, has larger potential safety hazard and is not beneficial to safe construction. In addition, when workers work the car roof, the safety belt is tied, the fixed end of the safety belt is hung on the contact net, and the contact net can move up and down under the action of external force, so that the contact net is connected with the grounding device unstably, and the grounding performance is affected.
Therefore, it is necessary to provide a following grounding device to overcome the drawbacks and shortcomings of the prior art and to realize the automation of the whole process of the servicing operation.
Disclosure of Invention
The invention aims to provide the following type grounding device which can replace manual ground wire hanging operation, realize automatic operation of hanging hooks and unhooking hooks, save the process of manually lifting a ground rod to hang a net, effectively avoid potential safety hazards existing in manual operation of the ground rod and reduce the labor intensity of operators; the device can realize the purpose that the hook jumps up and down along with the contact net.
To achieve the purpose, the invention adopts the following technical scheme:
a follow-up grounding device comprising:
a bracket;
a deceleration assembly mounted on the support;
the grounding component is connected to the output end of the speed reduction component and can rotate along with the rotation of the output end of the speed reduction component;
the elastic following component is connected with the bracket and the grounding component, and can enable the grounding component to be always in a contact state with the contact net;
the limiting assembly is electrically connected with the speed reducing assembly and is used for controlling the speed reducing assembly to be started, and controlling the speed reducing assembly to stop running according to signals sent by the limiting assembly.
As a preferable technical scheme, the speed reducing assembly comprises a motor and a speed reducer, the motor is electrically connected with the control system, the speed reducer is in transmission connection with the motor, and the grounding assembly is connected with an output shaft of the speed reducer.
As the preferable technical scheme, the grounding assembly comprises a connecting piece, a clamp, a grounding rod and a hook, wherein the connecting piece is sleeved on an output shaft of the speed reducer, the clamp is fixed on the connecting piece, the clamp can clamp the grounding rod, and the hook is arranged at one end, close to the contact net, of the grounding rod.
As a preferred technical scheme, a compensating clearance is arranged between the coupling piece and the output shaft of the speed reducer.
As the preferable technical scheme, the grounding rod comprises a connecting rod, an insulating rod and a transition head which are sequentially connected in the direction close to the contact net, the connecting rod can be clamped by the clamp, and the hook is arranged on the transition head.
As the preferable technical scheme, the elastic following assembly comprises a damper, a pull rod and a clamping device, wherein the damper is fixed on the support, the pull rod is rotatably arranged on the damper, the clamping device is arranged on the pull rod, and the clamping device can clamp the grounding rod.
As a preferable technical scheme, the clamping device is arranged at the tail end of the pull rod.
As the preferable technical scheme, limit assembly includes limit flange and limit switch, limit flange cover is established on the output shaft of reduction gear, limit flange's periphery epirelief is equipped with limit baffle, limit switch sets up on the support, limit switch electricity connect in control system, limit switch with during limit baffle contact, reduction assembly stop operation.
As the preferable technical scheme, limit switch includes couple limit switch and plucks and construct limit switch, couple limit switch is located the reducing assembly is close to one side of contact net, pluck and construct limit switch including first pluck and construct limit switch and second, first pluck construct limit switch with couple limit switch for limit flange symmetry sets up, the second plucks and constructs limit switch setting in the bottom of support.
As a preferable technical scheme, the elastic following component is a door closer.
Compared with the prior art, the invention has the advantages that:
1) The following type grounding device provided by the invention realizes the automation of the whole process of the servicing operation by adopting an automatic control theory and an advanced electromechanical integration technology, and omits the process of manually operating the grounding assembly, thereby avoiding the potential safety hazard existing in the manual operation process, reducing the labor intensity of operators, shortening the safety preparation time and improving the working efficiency and the locomotive operation efficiency; by arranging the elastic following component, the grounding component can still reliably follow when the contact net is jumped up and down, so that stable grounding performance is ensured.
2) The following type grounding device provided by the invention has the advantages of compact structure, small occupied area, simplicity and convenience in operation, safety in use, low cost, simplicity and convenience in maintenance and strong practicability.
Drawings
Fig. 1 is a schematic structural view of a hook state of a following type grounding device provided by the invention;
fig. 2 is a front view of a hook state of the following type grounding device provided by the invention;
FIG. 3 is an enlarged view of a portion of FIG. 2 at A;
fig. 4 is a schematic structural diagram of an off-hook state of the following grounding device provided by the invention;
fig. 5 is a front view of the following grounding device according to the present invention in an off-hook state.
In the figure:
1-a bracket; 2-an electric motor; 3-speed reducer; 4-a coupling; 5-clamping; 6-a grounding rod; 7-hooking; 8-contact net; 9-a damper; 10-a pull rod; 11-a clamping device; 12-limiting flanges; 13-a hook limit switch; 14-a first stripping limit switch; 15-a second picking limit switch;
31-wedge sleeve;
41-connecting sleeve; 42-connecting plates;
61-connecting rods; 62-insulating rod; 63-transition head;
121-limit baffles.
Detailed Description
The technical scheme of the invention is further described below with reference to the attached drawings and the embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the drawings related to the present invention are shown.
The embodiment provides a follow-up grounding device, as shown in fig. 1-5, including fixing the support 1 on the on-the-spot operation platform, be provided with the deceleration module on the support 1, the grounding module, elasticity follows subassembly and spacing subassembly, wherein, the grounding module is connected in the output of deceleration module, the grounding module can follow the rotation of deceleration module output and rotate in order to realize the net of hanging of grounding module and to pluck the net, elasticity follows the subassembly and can make grounding module and contact net 8 remain contact state throughout when the grounding module hangs the net, spacing subassembly and deceleration module are all electrically connected in control system (not shown in the figure), control system can control the opening of deceleration module, and can control the stop operation of deceleration module according to the signal control that spacing subassembly sent. The following type grounding device realizes the automation of the whole process of the servicing operation by adopting an automatic control theory and an advanced electromechanical integration technology, and omits the process of manually operating the grounding assembly, thereby avoiding the potential safety hazard existing in the manual operation process, reducing the labor intensity of operators, shortening the safety preparation time and improving the working efficiency and the locomotive operation efficiency; by arranging the elastic following component, the grounding component can still reliably follow when the contact net 8 is jumped up and down, so that stable grounding performance is ensured.
Specifically, the speed reducing assembly comprises a motor 2 and a speed reducer 3, the motor 2 is electrically connected to the control system, the speed reducer 3 is in transmission connection with the motor 2, the grounding assembly is connected to an output shaft of the speed reducer 3, and the grounding assembly can rotate along with rotation of the output shaft of the speed reducer 3. Further, the grounding assembly comprises a connecting piece 4, a clamp 5, a grounding rod 6 and a hook 7, wherein the connecting piece 4 comprises a connecting sleeve 41 and a connecting plate 42, the connecting sleeve 41 is sleeved on an output shaft of the speed reducer 3, the connecting plate 42 is vertically fixed at one end of the connecting sleeve 41, and the clamp 5 is fixed on the connecting plate 42; the grounding rod 6 comprises a connecting rod 61, an insulating rod 62 and a transition head 63 which are sequentially connected in the direction close to the contact net 8, the connecting rod 61 can be clamped by the clamp 5, and the hook 7 is arranged on the transition head 63. The clamps 5 in this embodiment are provided in two pairs to ensure the stability of clamping.
In this embodiment, the elastic following assembly includes a damper 9, a pull rod 10 and a clamping device 11, the damper 9 is fixed on the bracket 1, the pull rod 10 is rotatably disposed on the damper 9, the clamping device 11 is disposed on the pull rod 10, and the clamping device 11 can clamp the connecting rod 61, and preferably clamps the end of the connecting rod 61. More preferably, the clamping means 11 are provided at the end of the tie rod 10 to obtain maximum torque. The elastic following component in the embodiment is a door closer, and the door closer has wide application, simple structure, noiseless use and stable and reliable movement.
The coupling sleeve 41 in this embodiment is welded to the coupling plate 42, the inner diameter of the coupling sleeve 41 is larger than the outer diameter of the output shaft of the speed reducer 3, and the coupling plate 42 is in driving connection with the output shaft of the speed reducer 3 through the wedge sleeve 31, as shown in fig. 2-3. Further, the end of the output shaft of the speed reducer 3 is fixedly connected with a wedge sleeve 31, a wedge hole matched with the shape of the wedge sleeve 31 is correspondingly arranged on the connecting plate 42, and a compensation gap is arranged between the wedge sleeve 31 and the wedge hole. The advantage of setting up the compensation clearance lies in, when contact net 8 takes place to beat from top to bottom under the effect of external force, because the existence of compensation clearance for the grounding subassembly is under the effect of elasticity following the subassembly, can follow the jump of contact net 8 and swing by a small margin, has satisfied the demand of following the compensation, has guaranteed the reliable articulated of couple 7 and contact net 8, thereby has guaranteed the reliable stable grounding performance of contact net 8. The compensation gap in this embodiment is designed to be 10 °.
In this embodiment, the limiting assembly includes a limiting flange 12 and a limiting switch, the limiting flange 12 is sleeved on the output shaft of the reducer 3 and is abutted to the coupling sleeve 41, a limiting baffle 121 is convexly arranged on the circumferential surface of the limiting flange 12, the limiting switch is arranged on the bracket 1, the limiting switch is electrically connected to the control system, when the limiting switch contacts with the limiting baffle 121, the signal is transmitted to the control system, and the control system cuts off the power supply of the motor 2, so that the motor 2 stops running.
Specifically, the limit baffle 121 includes a first baffle and a second baffle, the limit switch includes a hook limit switch 13 and a hook limit switch, and the hook limit switch 13 is located at one side of the speed reducing assembly close to the contact net 8, and the hook limit switch is located at one side of the speed reducing assembly far away from the contact net 8. More preferably, the picking limit switch comprises a first picking limit switch 14 and a second picking limit switch 15, the first picking limit switch 14 and the hook limit switch 13 are symmetrically arranged relative to the limit flange 12, the second picking limit switch 15 is arranged at the bottom of the bracket 1, the first picking limit switch 14 is used for realizing the picking state by being matched with the second baffle plate when the picking action, and the second picking limit switch 15 is used for realizing the picking state by being matched with the grounding component when the picking action. The two picking limit switches have the advantages that double insurance is set for the picking action, namely, when one of the picking limit switches fails or fails, the picking state can be realized.
The following describes the operation of the following grounding device according to the present embodiment:
referring to fig. 4-5, the initial state of the following type grounding device is an off-hook state, that is, the grounding rod 6 is in a vertical state, at this time, the wedge sleeve 31 is kept stationary under the self-locking action of the speed reducing assembly, so that the connecting piece 4 cannot rotate anticlockwise towards the direction of the contact net 8, and the grounding assembly cannot rotate towards the direction of the contact net 8 under the resilience force of the elastic following assembly;
when the speed reducing assembly receives a hooking signal sent by the control system, the motor 2 starts to operate, the output shaft of the speed reducer 3 drives the wedge sleeve 31 to rotate anticlockwise towards the contact net 8, the wedge sleeve 31 drives the connecting plate 42 provided with the wedge hole to rotate together, and then the grounding assembly is driven to rotate, the grounding assembly stably rotates under the elastic recovery action of the elastic following assembly, and after the hook 7 at the tail end of the grounding assembly is hung on the contact net 8, the hook 7 stops rotating under the blocking action of the contact net 8; the speed reducing assembly continues to operate until the hook limit switch 13 contacts the first baffle plate and sends a signal to the control system, and the control system cuts off the power supply of the speed reducing assembly to stop operation; after that, under the action of the elastic following component, the grounding component is matched with the compensation gap on the connecting plate 42, so that the hook 7 can always follow the contact net 8 to jump and keep the set pressure with the contact net 8, the whole-course reliable grounding is realized, and the safety of operators is ensured;
when the speed reducing assembly receives the off-hook signal sent by the control system, the motor 2 starts to operate, the output shaft of the speed reducer 3 drives the grounding assembly to rotate clockwise in a direction away from the contact net 8, the first off-hook limit switch 14 sends a signal to the control system when contacting the second baffle plate, or the second off-hook limit switch 15 sends a signal to the control system when contacting the connecting rod 61 of the grounding assembly, and the control system cuts off the power supply of the speed reducing assembly to stop operation, and then the off-hook state is maintained.
It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (7)
1. A follow-up grounding device, comprising:
a bracket (1);
a deceleration assembly mounted on the support (1);
the grounding component is connected to the output end of the speed reduction component and can rotate along with the rotation of the output end of the speed reduction component;
the elastic following component is connected with the bracket (1) and the grounding component, and can enable the grounding component to be always in a contact state with the contact net (8);
the limiting assembly and the speed reducing assembly are electrically connected to a control system, and the control system can control the speed reducing assembly to be started and can control the speed reducing assembly to stop running according to signals sent by the limiting assembly;
the speed reduction assembly comprises a motor (2) and a speed reducer (3), the motor (2) is electrically connected with the control system, the speed reducer (3) is in transmission connection with the motor (2), and the grounding assembly is connected with an output shaft of the speed reducer (3);
the grounding assembly comprises a connecting piece (4), a clamp (5), a grounding rod (6) and a hook (7), wherein the connecting piece (4) is sleeved on an output shaft of the speed reducer (3), the clamp (5) is fixed on the connecting piece (4), the clamp (5) can clamp the grounding rod (6), and the hook (7) is arranged at one end, close to the contact net (8), of the grounding rod (6);
the elastic following component is a door closer.
2. The following-type grounding device according to claim 1, characterized in that a compensating gap is provided between the coupling member (4) and the output shaft of the reducer (3).
3. The following-type grounding device according to claim 1, characterized in that the grounding rod (6) comprises a connecting rod (61), an insulating rod (62) and a transition head (63) which are connected in sequence in a direction approaching the contact net (8), the clamp (5) can clamp the connecting rod (61), and the hook (7) is arranged on the transition head (63).
4. The following type grounding device according to claim 1, wherein the elastic following assembly comprises a damper (9), a pull rod (10) and a clamping device (11), the damper (9) is fixed on the support (1), the pull rod (10) is rotatably arranged on the damper (9), the clamping device (11) is arranged on the pull rod (10), and the clamping device (11) can clamp the grounding rod (6).
5. The following-type grounding device according to claim 4, characterized in that the clamping device (11) is arranged at the end of the pull rod (10).
6. The following type grounding device according to claim 1, wherein the limit assembly comprises a limit flange (12) and a limit switch, the limit flange (12) is sleeved on an output shaft of the speed reducer (3), a limit baffle (121) is convexly arranged on the circumferential surface of the limit flange (12), the limit switch is arranged on the support (1), the limit switch is electrically connected to the control system, and the speed reducer assembly stops running when the limit switch is in contact with the limit baffle (121).
7. The following type grounding device according to claim 6, wherein the limit switch comprises a hook limit switch (13) and a unhooking limit switch, the hook limit switch (13) is located on one side of the speed reduction assembly, which is close to the contact net (8), the unhooking limit switch comprises a first unhooking limit switch (14) and a second unhooking limit switch (15), the first unhooking limit switch (14) and the hook limit switch (13) are symmetrically arranged relative to the limit flange (12), and the second unhooking limit switch (15) is arranged at the bottom of the support (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810073729.XA CN108110584B (en) | 2018-01-25 | 2018-01-25 | Following type grounding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810073729.XA CN108110584B (en) | 2018-01-25 | 2018-01-25 | Following type grounding device |
Publications (2)
| Publication Number | Publication Date |
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| CN108110584A CN108110584A (en) | 2018-06-01 |
| CN108110584B true CN108110584B (en) | 2024-02-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810073729.XA Active CN108110584B (en) | 2018-01-25 | 2018-01-25 | Following type grounding device |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109449629A (en) * | 2018-12-20 | 2019-03-08 | 北京铁道工程机电技术研究所股份有限公司 | A kind of contact net earthing or grounding means, contact net ground connection control system and control method |
| CN110391602A (en) * | 2019-08-29 | 2019-10-29 | 吴晨 | Automatic switch cabinet |
| FR3116028B1 (en) * | 2020-11-10 | 2022-10-07 | SNCF Voyageurs | System for the temporary electrical connection of a catenary to a circulation rail of a railway line |
| FR3120574A1 (en) * | 2021-03-14 | 2022-09-16 | Securite Machines Systemes | Perching device and method for earthing a railway catenary |
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| CN106655008A (en) * | 2015-11-04 | 2017-05-10 | 国网辽宁省电力有限公司本溪供电公司 | High voltage earthing operation auxiliary device for voltage transformer area on 20kV distribution pillar |
| CN106877024A (en) * | 2017-02-21 | 2017-06-20 | 国网安徽省电力公司检修公司 | Electric hang grounding wire device |
| CN106869658A (en) * | 2017-03-07 | 2017-06-20 | 希美克(广州)实业有限公司 | A kind of automatic shutoff door gear and door |
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| CN107611638A (en) * | 2017-09-12 | 2018-01-19 | 国网山东省电力公司潍坊供电公司 | Ground wire hangs servicing unit |
| CN207819143U (en) * | 2018-01-25 | 2018-09-04 | 北京铁道工程机电技术研究所股份有限公司 | A kind of follower type earthing or grounding means |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04295215A (en) * | 1991-03-25 | 1992-10-20 | Ngk Insulators Ltd | Automatic grounding device for grounding conductor |
| CN103531925A (en) * | 2013-10-29 | 2014-01-22 | 国网河南省电力公司漯河供电公司 | High voltage grounding tool for power maintenance |
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| CN106869658A (en) * | 2017-03-07 | 2017-06-20 | 希美克(广州)实业有限公司 | A kind of automatic shutoff door gear and door |
| CN206506044U (en) * | 2017-03-15 | 2017-09-19 | 纪墨 | A kind of Portable power construction grounding device of driven by power |
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| CN108110584A (en) | 2018-06-01 |
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