CN211455981U - Automatic earthing device of formula of pushing down - Google Patents
Automatic earthing device of formula of pushing down Download PDFInfo
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- CN211455981U CN211455981U CN202020180330.4U CN202020180330U CN211455981U CN 211455981 U CN211455981 U CN 211455981U CN 202020180330 U CN202020180330 U CN 202020180330U CN 211455981 U CN211455981 U CN 211455981U
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Abstract
The utility model discloses an automatic earthing device of formula of pushing down, automatic earthing device of formula of pushing down includes rotary drive mechanism, first four-bar linkage, earthing rod postbrachium, earthing rod forearm, earthing arm joint, driven lever and ground connection module. The utility model discloses automatic ground connection dress of formula of pushing down contacts the contact net with ground connection module from top to bottom through setting up three four-bar linkage, has improved contact stability to the operator can follow the contact condition of supreme direct observation contact net down, has improved the convenience of judgement.
Description
Technical Field
The utility model relates to a railway technology field, concretely relates to automatic earthing device of formula of pushing down.
Background
The railway electrification contact network is a line which is erected along an electrification railway and supplies power to an electric locomotive or an electric motor train unit. Because the electric locomotive receives electric energy from the contact net in a moving state, the contact net is required to be safe and reliable and have good elasticity, so that uninterrupted power supply and high wear resistance and corrosion resistance are ensured. The general contact network of the electrified railway is an overhead flexible cable type (also adopts a rigid type), and consists of a contact suspension device, a supporting device and the like.
In the maintenance work of railway engineering, motor cars and subway vehicles, maintenance personnel need to climb up the roof to carry out maintenance operation, and in order to conveniently climb up the roof, a roof climbing platform is generally designed in a maintenance yard. When the overhead working is carried out in an electrified region, the power supply of a contact net needs to be cut off, and meanwhile, the contact net needs to be effectively grounded. The existing grounding mechanism generally adopts a contact mode that a grounding arm turns from bottom to top. Because the contact net has flexibility, when the locomotive rises the bow and tests the electricity, very easily with the contact net jack-up for the earthing knife of earthing arm breaks away from the contact net, appears the hidden danger that can not effectively ground connection. In addition, due to the blocking of the grounding knife box, an operator cannot obviously see the attachment of the grounding knife and a contact net, so that the judgment of the operator is difficult.
SUMMERY OF THE UTILITY MODEL
Therefore, the utility model provides an automatic earthing device of formula of pushing down to solve among the prior art because the contact failure that the grounding arm leads to by the contact net of lower supreme upset and the problem that there is the difficulty in judgement.
In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:
the utility model provides a down-pressing automatic grounding device, the down-pressing automatic grounding device comprises a rotary driving mechanism, a first four-bar mechanism, a grounding rod rear arm, a grounding rod front arm, a grounding arm joint, a driven rod and a grounding module, the first four-bar mechanism comprises a first hinge shaft, a second hinge shaft, a third hinge shaft, a fourth hinge shaft, a first connecting rod connecting the first hinge shaft and the fourth hinge shaft, a second connecting rod connecting the first hinge shaft and the second hinge shaft, a third connecting rod connecting the second hinge shaft and the third hinge shaft, and a fourth connecting rod connecting the third hinge shaft and the fourth hinge shaft, the first hinge shaft is fixedly connected with the rotary driving mechanism and can be driven by the rotary driving mechanism to rotate, the fourth hinge shaft is fixedly connected with one end of the grounding rod rear arm, the second hinge shaft and the third hinge shaft are driven shafts, the grounding arm joint has a T-shaped joint body and a joint arm connected with the T-shaped joint body, each end of the T-shaped joint body is provided with a sixth hinge shaft, a seventh hinge shaft and a ninth hinge shaft respectively, the other end of the joint body and the other end of the rear arm of the grounding rod are hinged through the seventh hinge shaft, the joint body and one end of the driven rod are hinged through the sixth hinge shaft, the joint body and one end of the joint arm are hinged through the ninth hinge shaft, the other end of the joint arm and the front arm of the grounding rod are hinged through the eighth hinge shaft, the joint body and the front arm of the grounding rod are hinged through the tenth hinge shaft, the other end of the driven rod is provided with a fifth hinge shaft, the fourth hinge shaft, the fifth hinge shaft, the sixth hinge shaft, the seventh hinge shaft, a fifth connecting rod, the driven rod, the joint body and the rear arm of the grounding rod are connected between the fourth hinge shaft and the fifth hinge shaft to form a second mechanism, and the seventh hinge shaft, the ninth hinge shaft, the eighth hinge shaft, the tenth hinge shaft and the rear arm of the grounding rod are connected between the seventh hinge shaft, the ninth hinge shaft, the eighth hinge, The joint body, the joint arm and the front arm of the grounding rod form a third four-bar mechanism.
Furthermore, the rotary driving mechanism comprises a speed reduction motor, a single-head worm and a turbine which are in transmission connection in sequence, and the turbine is fixedly connected with the first hinge shaft.
Further, the ground connection module includes earth conductor, wiring fastening bolt and ground conductor board, earth conductor follows the earth bar forearm extends to the earth bar postbrachium, the ground conductor board is connected the earth bar forearm both sides just are less than the earth bar forearm, wiring fastening bolt electricity is connected earth conductor and ground conductor board.
Further, the ground module still includes insulating interval bolt group, insulating spacer, insulation board, stroke guide arm, spring box fastening bolt group, adjusting washer, spring box and spring, the insulation board along the direction of height set up in the earth bar forearm with between the ground wire board, the spring box sets up in through spring box fastening bolt group in the earth bar forearm, the ground wire board with the insulation board links to each other through insulating interval bolt group and insulating spacer, the lower extreme of stroke guide arm is connected the insulation board, the movably pass of upper end the spring box, the spring sets up in the spring box and overlaps stroke guide arm periphery and with the lower part of stroke guide arm links to each other.
Further, the automatic earthing device of formula of pushing down still includes the headstock, ground is connected to the lower extreme of headstock, fifth hinge shaft and fourth hinge shaft from top to bottom with the upper end of headstock is articulated.
Furthermore, the automatic grounding device of formula of pushing down still includes ground connection status indicator lamp and detection and indicating cable, ground connection status indicator lamp with earth conductor links to each other.
The embodiment of the utility model provides a have following advantage:
the utility model discloses automatic ground connection dress of formula of pushing down contacts the contact net with ground connection module from top to bottom through setting up three four-bar linkage, has improved contact stability to the operator can follow the contact condition of supreme direct observation contact net down, has improved the convenience of judgement.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structure, ratio, size and the like shown in the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by people familiar with the technology, and are not used for limiting the limit conditions which can be implemented by the present invention, so that the present invention has no technical essential significance, and any structure modification, ratio relationship change or size adjustment should still fall within the scope which can be covered by the technical content disclosed by the present invention without affecting the efficacy and the achievable purpose of the present invention.
Fig. 1 is a schematic structural diagram of a push-down automatic grounding device according to an embodiment of the present invention (the push-down automatic grounding device is folded);
fig. 2 is a schematic structural diagram of a push-down automatic grounding device according to an embodiment of the present invention (dropping of the push-down automatic grounding device);
fig. 3 is a top view of a front arm of a grounding rod according to an embodiment of the present invention;
fig. 4 is a vertical cross-sectional view of a front arm of a grounding rod provided in an embodiment of the present invention;
fig. 5 is a side view of the push-down automatic grounding device according to the embodiment of the present invention.
In the figure:
the device comprises a speed reducing motor 1, a single-headed worm 2, a turbine 3, a first four-bar mechanism 4, a grounding rod rear arm 5, a grounding rod front arm 6, a grounding arm joint 7, a driven rod 8, a grounding lead 9, a wiring fastening bolt 10, a grounding lead plate 11 (copper or carbon), an insulation spacing bolt group 12, an insulation spacer sleeve 13, an insulation plate 14, a stroke guide rod 15, a spring box fastening bolt group 16, an adjusting washer 17, a spring box 18, a spring 19, a detection and indication cable 102, a power box 101, a grounding arm 20, a grounding module 103, a grounding state indicator lamp 104, a contact net 110, first to tenth hinged shafts a to j, a first connecting rod g1, a second connecting rod g2, a third connecting rod g3, a fourth connecting rod g4 and a fifth connecting rod g 5.
Detailed Description
The present invention is described in terms of specific embodiments, and other advantages and benefits of the present invention will become apparent to those skilled in the art from the following disclosure. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Example 1
As shown in fig. 1-2 and 5, the present embodiment provides a press-down type automatic grounding device, which includes a rotation driving mechanism, a first four-bar linkage 4, a rear grounding rod arm 5, a front grounding rod arm 6, a grounding arm joint 7, a driven rod 8 and a grounding module 103, wherein the first four-bar linkage 4 includes a first hinge shaft a, a second hinge shaft b, a third hinge shaft c, a fourth hinge shaft d, a first link g1 connecting the first hinge shaft a and the fourth hinge shaft d, a second link g2 connecting the first hinge shaft a and the second hinge shaft b, a third link g3 connecting the second hinge shaft b and the third hinge shaft c, and a fourth link g4 connecting the third hinge shaft c and the fourth hinge shaft d, the first hinge shaft a is fixedly connected to the rotation driving mechanism and can be rotated by the rotation driving mechanism, the fourth hinge shaft d is fixedly connected to one end of the rear grounding rod arm 5, the second hinge shaft b and the third hinge shaft c are driven shafts, the grounding arm joint 7 is provided with a T-shaped joint body and a joint arm connected with the T-shaped joint body, each end of the T-shaped joint body is provided with a sixth hinge shaft f, a seventh hinge shaft g and a ninth hinge shaft i, the joint body is hinged to the other end of the grounding rod rear arm 5 through the seventh hinge shaft g, the joint body is hinged to one end of the driven rod 8 through the sixth hinge shaft f, the joint body is hinged to one end of the joint arm through the ninth hinge shaft i, the other end of the joint arm is hinged to the grounding rod front arm 6 through the eighth hinge shaft h, the joint body is hinged to the grounding rod front arm 6 through the tenth hinge shaft j, the other end of the driven rod 8 is provided with the fifth hinge shaft e, the fourth hinge shaft d, the fifth hinge shaft e, the sixth hinge shaft f, the seventh hinge shaft g and a fifth connecting rod g5 connecting between the fourth hinge shaft d and the fifth hinge shaft e, The driven rod 8, the joint body and the grounding rod rear arm 5 form a second four-bar mechanism, and the seventh hinge shaft g, the ninth hinge shaft i, the eighth hinge shaft h, the tenth hinge shaft j, the grounding rod rear arm 5, the joint body, the joint arm and the grounding rod front arm 6 which are connected between the seventh hinge shaft g, the ninth hinge shaft i, the eighth hinge shaft h and the tenth hinge shaft j form a third four-bar mechanism. The rotary driving mechanism comprises a speed reducing motor 1, a single-head worm 2 and a worm wheel 3 which are in transmission connection in sequence, and the worm wheel 3 is fixedly connected with the first hinge shaft a.
The working principle of the device of the embodiment is as follows: the output rotation of the gear motor 1 drives a worm reducer composed of a single-head worm 2 and a turbine 3 through an intermediate link such as coupling or key connection, and outputs the low-speed rotation of the turbine 3 vertical to the axis of the gear motor 1. An output shaft of the turbine 3 is fixedly connected to a first hinge shaft a of the first four-bar mechanism 4, the first four-bar mechanism 4 comprises a first hinge shaft a, a second hinge shaft b, a third hinge shaft c, a fourth hinge shaft d and four connecting rods for connecting the four hinge shafts, and a first connecting rod g1 between the first hinge shaft a and the fourth hinge shaft d is a frame. The rotation of the output shaft of the turbine 3 drives a second connecting rod g2 of the four-bar mechanism connected between a first hinge shaft a and a second hinge shaft b to perform a revolving motion, the second connecting rod g2 swings through control output in work, the third connecting rod g3 between the second hinge shaft b and a third hinge shaft c is transmitted to a fourth connecting rod g4 between the third hinge shaft c and a fourth hinge shaft d, and the fourth connecting rod g4 swings by 0-90 degrees. The second four-bar mechanism in the power box comprises a fourth hinge shaft d, a fifth hinge shaft e, a sixth hinge shaft f, a seventh hinge shaft g and four connecting rods for connecting the four hinge shafts, the power box 1 is fixed through a fifth connecting rod g5 between the fourth hinge shaft d and the fifth hinge shaft e, a fifth connecting rod g5 which is connected with the fourth hinge shaft d and the fifth hinge shaft e at the fourth hinge shaft d is fixedly connected with a fourth connecting rod g4 of the first four-bar mechanism 4, and the rear arm 5 of the grounding rod and the fourth connecting rod g4 have the same 0-90-degree swing. The driven rod 8 connecting the fifth hinge shaft e and the sixth hinge shaft f has a structural support and a manufacturing process adjustment function, so that the second four-bar mechanism forms an approximately parallel four-bar mechanism. In the mechanism, two seventh hinge shafts g and a ninth hinge shaft i which are hinged on a grounding arm joint 7 between a sixth hinge shaft f and the seventh hinge shaft g, and an eighth hinge shaft h and a tenth hinge shaft j which are hinged on a front arm 6 of a grounding rod also form a planar third four-bar mechanism. When the rear arm 5 of the grounding rod swings from the vertical position to the horizontal position, the joint 7 of the grounding rod between the seventh hinge shaft g and the tenth hinge shaft j of the third four-bar mechanism can be regarded as a motive power piece and rotates anticlockwise in the vertical plane around the seventh hinge shaft g, and then the front arm 6 of the grounding rod between the tenth hinge shaft j and the eighth hinge shaft h swings to obtain the motion track of the front arm of the grounding rod hinged on the front arm of the grounding rod, which is unfolded from the vertical position to the horizontal position. The grounding arm is composed of a transmission mechanism composed of a parallel four-bar mechanism and a guide mechanism composed of another four-bar mechanism, the input is the rotation of 0-90 degrees of the output of the power box, a parallel four-bar mechanism connecting rod is fixed on the power box, and the output forms the bending action of 0-180 degrees of the front arm and the rear arm of the grounding arm; in-place detection is carried out at two positions of 0 degree and 90 degrees, and corresponding signals are provided; the automatic locking function at two positions of 0 degree and 90 degrees is realized; considering that the swing arm does not have large impact when being swung, the structure with two sections of swing arms different in length is adopted, and the lengths of the rear arm 5 and the front arm 6 of the grounding rod are respectively set to be 1.9m and 1.3 m. In the design, the limitation of a manufacturing process and an installation process is considered, and in the parallel four-bar mechanism where the swinging pair connected with the grounding arm is located, an adjusting rod is designed in the driven part, so that the length of a certain margin can be adjusted according to the requirement during installation, and the unfolding and folding position states of the grounding arm can be further adjusted.
The utility model discloses automatic ground connection dress of formula of pushing down contacts the contact net with ground connection module from top to bottom through setting up three four-bar linkage, has improved contact stability to the operator can follow the contact condition of supreme direct observation contact net down, has improved the convenience of judgement.
Example 2
As shown in fig. 3 to 4, in the present embodiment, the grounding module 103 includes a grounding wire 9, a wire fastening bolt 10, and a grounding wire plate 11, the grounding wire 9 extends along the front grounding rod arm 6 to the rear grounding rod arm 5, the grounding wire plate 11 is connected to both sides of the front grounding rod arm 6 and is lower than the front grounding rod arm 6, and the wire fastening bolt 10 electrically connects the grounding wire 9 and the grounding wire plate 11. Grounding module 103 still includes insulating interval bolt group 12, insulating spacer 13, insulating board 14, stroke guide 15, spring case fastening bolt group 16, adjusting washer 17, spring case 18 and spring 19, insulating board 14 along the direction of height set up in grounding rod forearm 6 with between the grounding wire board 11, spring case 18 through spring case fastening bolt group 16 set up in grounding rod forearm 6, grounding wire board 11 with insulating board 14 links to each other through insulating interval bolt group 12 and insulating spacer 13, the lower extreme of stroke guide 15 is connected insulating board 14, the movably passing of upper end spring case 18, spring 19 sets up in spring case 18 and overlaps stroke guide 15 periphery and with the lower part of stroke guide 15 links to each other. The automatic earthing device of formula of pushing down still includes headstock 101, ground is connected to the lower extreme of headstock 101, fifth hinge shaft e and fourth hinge shaft d from top to bottom with the upper end of headstock 101 is articulated. The press-down automatic grounding device further comprises a grounding state indicator light 104 and a detection and indication cable 102, wherein the grounding state indicator light 104 is connected with the grounding conductor 9.
The grounding module of the present embodiment includes: the grounding wire 9, the wire fastening bolt 10, the grounding wire plate 11 (copper or carbon), the insulating spacer bolt group 12, the insulating spacer sleeve 13, the insulating plate 14, the stroke guide rod 15, the spring box fastening bolt group 16, the adjusting washer 17, the spring box 18, the spring 19 and other parts. A pair of ground lead plates 11 (for example, ground lead plates made of copper or carbon) disposed on the left and right sides of the end of the ground bar front arm 6, an insulating plate 14 disposed below each ground lead plate 11 and spaced apart from and fixed to the ground lead plate 11 by bolts, and a spring case 18 disposed below the insulating plate 14 and spaced apart from and movably connected to the insulating plate 14 by a stroke guide 15. The spring box 18 is installed on two sides of the front arm 6 of the grounding rod through a bolt and nut set. The travel guide 15 extends simultaneously into the interior of the spring case 18 and the end of the travel guide 15 protrudes from the bottom of the spring case, enabling guiding and constraining degrees of freedom. An adjusting washer 17 is arranged between the end of the travel guide 15 and the bottom of the spring case 18 for adjusting the height position of the spring case 18 relative to the travel guide 15. Furthermore, a spring 19 is arranged inside the spring housing 18 through the middle of the travel guide 15. The upper and lower ends of the spring 19 press against the top and bottom of the spring case 18.
The grounding module mainly has the effects of ensuring that the grounding electrode is reliably connected with a contact network, ensuring that a contact network wire moves up and down, and keeping a certain contact pressure and a certain following stroke. The 110 sign work piece represents the power supply contact net of electrified railway, and at the ground wire station that articulates, two earth plates of ground module pass through spring pressure, guarantee reliable crimping on the contact net wire.
The hardware implementation comprises an electrical control box which can be arranged at any position convenient for operation and maintenance, an operation panel of the electrical control box is provided with ground wire hanging and removing state and power state indicating lamps, ground wire hanging and removing and emergency stop buttons and the like, and the electrical control box has functions of near-moving and far-moving control and in-place detection. The electric control box controls the lifting and falling angles of the automatic ground wire hanging device by using a stroke positioning switch and a program, and positioning blocks are arranged at two limit positions to be used as overtravel protection, so that the support of a contact net is mainly prevented from exceeding the designed pressure; and the swinging and falling speeds of the grounding arm are controlled, so that the time of 8-10 seconds is ensured, and the speed cannot be too high.
Although the invention has been described in detail with respect to the general description and the specific embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made based on the invention. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (6)
1. A push-down type automatic grounding device, comprising a rotation driving mechanism, a first four-bar mechanism (4), a grounding rod rear arm (5), a grounding rod front arm (6), a grounding arm joint (7), a driven rod (8) and a grounding module (103), wherein the first four-bar mechanism (4) comprises a first hinge shaft (a), a second hinge shaft (b), a third hinge shaft (c), a fourth hinge shaft (d), a first connecting rod (g1) connecting the first hinge shaft (a) and the fourth hinge shaft (d), a second connecting rod (g2) connecting the first hinge shaft (a) and the second hinge shaft (b), a third connecting rod (g3) connecting the second hinge shaft (b) and the third hinge shaft (c), and a fourth connecting rod (g4) connecting the third hinge shaft (c) and the fourth hinge shaft (d), the first hinge shaft (a) is fixedly connected to the rotation driving mechanism and is rotatably driven by the rotation driving mechanism, the fourth hinge shaft (d) is fixedly connected with one end of the grounding rod rear arm (5), the second hinge shaft (b) and the third hinge shaft (c) are driven shafts, the grounding arm joint (7) is provided with a T-shaped joint body and a joint arm connected with the T-shaped joint body, each end of the T-shaped joint body is respectively provided with a sixth hinge shaft (f), a seventh hinge shaft (g) and a ninth hinge shaft (i), the joint body is hinged with the other end of the grounding rod rear arm (5) through the seventh hinge shaft (g), the joint body is hinged with one end of the driven rod (8) through the sixth hinge shaft (f), the joint body is hinged with one end of the joint arm through the ninth hinge shaft (i), the other end of the joint arm is hinged with the grounding rod front arm (6) through the eighth hinge shaft (h), the joint body is hinged with the grounding rod front arm (6) through the tenth hinge shaft (j), the other end of the driven rod (8) is provided with a fifth hinge shaft (e), a fourth hinge shaft (d), the fifth hinge shaft (e), a sixth hinge shaft (f), a seventh hinge shaft (g) and a fifth connecting rod (g5) connected between the fourth hinge shaft (d) and the fifth hinge shaft (e), the driven rod (8), the joint body and the grounding rod rear arm (5) form a second four-bar mechanism, and the seventh hinge shaft (g), the ninth hinge shaft (i), the eighth hinge shaft (h), the tenth hinge shaft (j) and the grounding rod rear arm (5), the joint body, the joint arm and the grounding rod front arm (6) connected between the seventh hinge shaft (g), the ninth hinge shaft (i), the eighth hinge shaft (h) and the tenth hinge shaft (j) form a third four-bar mechanism.
2. The automatic grounding device of claim 1, wherein the rotary driving mechanism comprises a reduction motor (1), a single-headed worm (2) and a worm wheel (3) which are in transmission connection in sequence, and the worm wheel (3) is fixedly connected with the first hinge shaft (a).
3. The push-down automatic grounding device according to claim 1, wherein the grounding module (103) comprises a grounding wire (9), a wire fastening bolt (10) and a grounding wire plate (11), the grounding wire (9) extends along the front grounding rod arm (6) to the rear grounding rod arm (5), the grounding wire plate (11) is connected on both sides of the front grounding rod arm (6) and is lower than the front grounding rod arm (6), and the wire fastening bolt (10) electrically connects the grounding wire (9) and the grounding wire plate (11).
4. The push-down automatic grounding device according to claim 3, wherein the grounding module (103) further comprises an insulating spacer bolt set (12), an insulating spacer set (13), an insulating plate (14), a stroke guide rod (15), a spring case fastening bolt set (16), an adjusting washer (17), a spring case (18) and a spring (19), the insulating plate (14) is disposed between the grounding rod front arm (6) and the grounding conductor plate (11) along a height direction, the spring case (18) is disposed in the grounding rod front arm (6) through the spring case fastening bolt set (16), the grounding conductor plate (11) and the insulating plate (14) are connected through the insulating spacer bolt set (12) and the insulating spacer set (13), a lower end of the stroke guide rod (15) is connected to the insulating plate (14), and an upper end thereof movably penetrates through the spring case (18), the spring (19) is arranged in the spring box (18), sleeved on the periphery of the stroke guide rod (15) and connected with the lower part of the stroke guide rod (15).
5. The automatic grounding device of claim 1, further comprising a power box (101), wherein the lower end of the power box (101) is connected to the ground, and the fifth hinge shaft (e) and the fourth hinge shaft (d) are hinged to the upper end of the power box (101) from top to bottom.
6. The push-down automatic grounding device according to claim 3, further comprising a grounding status indicator lamp (104) and a detection and indication cable (102), wherein the grounding status indicator lamp (104) is connected to the grounding conductor (9).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020180330.4U CN211455981U (en) | 2020-02-18 | 2020-02-18 | Automatic earthing device of formula of pushing down |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020180330.4U CN211455981U (en) | 2020-02-18 | 2020-02-18 | Automatic earthing device of formula of pushing down |
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| CN211455981U true CN211455981U (en) | 2020-09-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112217001A (en) * | 2020-09-14 | 2021-01-12 | 广东雅达电子股份有限公司 | Contact net safety measure operation earthing device |
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2020
- 2020-02-18 CN CN202020180330.4U patent/CN211455981U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112217001A (en) * | 2020-09-14 | 2021-01-12 | 广东雅达电子股份有限公司 | Contact net safety measure operation earthing device |
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