CN110047664B - Lifting change-over switch - Google Patents
Lifting change-over switch Download PDFInfo
- Publication number
- CN110047664B CN110047664B CN201910152013.3A CN201910152013A CN110047664B CN 110047664 B CN110047664 B CN 110047664B CN 201910152013 A CN201910152013 A CN 201910152013A CN 110047664 B CN110047664 B CN 110047664B
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- Prior art keywords
- movable plate
- contact head
- contact
- switch
- controller
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/02—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/02—Bases, casings, or covers
- H01H9/04—Dustproof, splashproof, drip-proof, waterproof, or flameproof casings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/16—Indicators for switching condition, e.g. "on" or "off"
- H01H9/161—Indicators for switching condition, e.g. "on" or "off" comprising light emitting elements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/20—Interlocking, locking, or latching mechanisms
- H01H9/28—Interlocking, locking, or latching mechanisms for locking switch parts by a key or equivalent removable member
Landscapes
- Switch Cases, Indication, And Locking (AREA)
- Push-Button Switches (AREA)
Abstract
A lifting change-over switch comprises a shell, a fixed plate, a movable plate and a controller, wherein the shell comprises a shell main body and a control panel, the fixed plate is fixedly connected with a spring and is abutted against the inner wall of the shell, the fixed plate is respectively provided with a first contact head, a second contact head and a plurality of first travel switches, the first contact head and the second contact head are respectively arranged on one side close to the movable plate, the first contact head and the second contact head are respectively and symmetrically arranged, each first travel switch is also arranged on one side close to the movable plate, the movable plate comprises a first movable plate and a second movable plate, a third contact head and a fourth contact head are arranged at the positions of the first movable plate and the second movable plate corresponding to the first contact head and the second contact head, the first movable plate and the second movable plate are fixedly connected with racks and are meshed with the same gear, a plurality of second travel switches and a plurality of limiting columns are arranged on the movable paths of the first movable plate, the shell is also internally provided with a controller. The invention can reduce electric arc to the maximum extent and realize high-efficiency conversion effect.
Description
Technical Field
The invention relates to the field of electrical equipment, in particular to a lifting type change-over switch.
Background
The small universal change-over switch can be used for switching two or more power supplies or loads, and is widely applied to daily life.
In order to ensure that the transfer switch can stably operate in a particularly severe environment, an additional sealed shell needs to be added to the transfer switch to prevent dust and sand from entering the interior of the transfer switch or not entering the interior of the transfer switch, and further influencing the normal operation of the transfer switch.
The existing rotary change-over switch adopts the principle of staggered contact conduction of two rotating contact plates, so that the influence between the two contact heads is easily caused. Meanwhile, too close distance of the contact plates also affects the control effect. If the inside is out of order, the operator needs to open for inspection, which increases the inspection workload and reduces the efficiency of the work during the inspection.
In addition, the transfer switch with two contact plates in too close distance is only suitable for the low-voltage field, and the arc influence is easily generated due to too close distance in the high-voltage range, which is not beneficial to the transfer control.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides high-efficiency conversion, can meet different customer requirements, does not generate electric arc at the distance between two electrodes, and simultaneously improves the conversion efficiency. The invention adopts the following structure:
the invention provides a lifting change-over switch, which comprises a shell main body, a control panel, a fixed plate, a movable plate and a controller, wherein the fixed plate is abutted against the inner wall of the shell main body, the fixed plate is respectively provided with a first contact, a second contact and a plurality of first travel switches, the first contact and the second contact are both arranged on one side facing the movable plate, the first contact and the second contact are respectively and symmetrically arranged, each first travel switch is arranged on one side facing the movable plate, the movable plate comprises a first movable plate and a second movable plate, a third contact is arranged at the position of the first movable plate corresponding to the first contact, a fourth contact is arranged at the position of the second movable plate corresponding to the second contact, and the first movable plate and the second movable plate are both fixedly connected with a rack and meshed with the same gear, the gear is connected with the driving mechanism and driven by the driving mechanism to rotate, and a controller is arranged in the shell main body.
Furthermore, the shell is provided with a plurality of wiring members, each wiring member penetrates through the inner side and the outer side of the shell, and the wiring members are provided with fixing screws or bolts.
Furthermore, a shielding cover is arranged on the periphery of the controller.
Further, the first contact, the second contact, the third contact and the fourth contact are respectively in conductive connection with the corresponding wiring members through conducting wires.
Furthermore, four end corners of the control panel are respectively provided with a fixing hole.
Furthermore, a switching button, a locking button, a first movable plate state indicating lamp and a second movable plate state indicating lamp are further arranged on the control panel.
Further, the locking button controls a locking device to lock up and down movement of the racks of the first movable plate and the second movable plate.
Further, insulating layers are arranged between the first movable plate and the second movable plate and on the two sides of the first movable plate and the second movable plate, which are close to the inner wall of the shell.
Furthermore, an insulating layer is arranged on the fixing plate close to the inner wall side of the shell.
Further, the controller controls the driving mechanism to rotate forwards and backwards.
The invention has the beneficial effects that: the sealed shell is adopted, so that sand dust and coal cannot enter the interior of the change-over switch through the gap, and the change-over switch can run in a relatively sealed environment, so that the normal, stable and effective running of the change-over switch can be ensured, and the service life of the change-over switch is prolonged; in addition, a liftable conversion mode is adopted, so that the conversion efficiency is greatly facilitated, and the probability of misoperation can be reduced; the controller drives the driving mechanism to ensure the rapid lifting conversion; in addition, one part of the conductive piece of the mounting seat of the wiring component is positioned in the shell, the other part of the conductive piece of the mounting seat of the wiring component is exposed outside the shell, the conductive piece of the change-over switch positioned in the shell is connected through a wire, and the part positioned outside the shell is connected with an external wiring wire, so that the replacement is easy when the external wiring wire is damaged, and the wiring component in the shell of the change-over switch does not need to be opened.
Drawings
FIG. 1 is a cross-sectional view of a diverter switch of the present invention.
Fig. 2 is a top view of the transfer switch of the present invention.
Detailed Description
The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms described above will be understood by those of ordinary skill in the art according to the specific circumstances.
The embodiment provides a lifting type change-over switch, which comprises a housing main body, a control panel, a fixed plate, a movable plate and a controller, and is characterized in that the fixed plate is abutted against the inner wall of the housing main body, the fixed plate is respectively provided with a first contact 4, a second contact 5 and a plurality of first travel switches, the first contact 4 and the second contact 5 are both arranged on one side facing the movable plate, the first contact 4 and the second contact 5 are respectively and symmetrically arranged, each first travel switch 7 is arranged on one side facing the movable plate, the movable plate comprises a first movable plate and a second movable plate, a third contact 3 is arranged on the first movable plate corresponding to the first contact 4, a fourth contact 6 is arranged on the second movable plate corresponding to the second contact 5, the first movable plate and the second movable plate are fixedly connected with the rack 2 and meshed with the same gear, the gear is connected with the driving mechanism and driven by the driving mechanism to rotate, and the controller 10 is arranged in the shell main body. Specifically, spring 19 that is equipped with on the fixed plate has fastening, spacing effect, simultaneously, has guaranteed the fly leaf lies in the in-process of fixed plate butt to have the effect of a buffering, first contact 4 with second contact 5 global is the circular arc type, circular arc contact surface can increase with third contact 3, fourth contact 6's area of contact can guarantee good electric conductive property. The limit post 9 is disposed flush with the second travel switch 8, that is, the first movable plate and the second movable plate simultaneously contact the limit post 9 and the second travel switch 8 on the way of returning. When the second travel switch 8 is touched, a control signal is transmitted into the controller, and the controller controls the driving mechanism to stop rotating so as to prevent the gear 1 from being damaged due to the fact that the driving mechanism rotates beyond the set maximum range. In addition, a plurality of first travel switches 7 are arranged on one side of the fixed plate facing the first movable plate, and in the process that the first movable plate and the second movable plate abut against the fixed plate, when the first movable plate and the second movable plate abut against the first travel switches 7, the first travel switches 7 transmit signals to the controller, and the controller controls the driving mechanism to stop rotating, so that the first movable plate or the second movable plate is stopped being driven. The racks on the two sides of the gear are symmetrically distributed, the tooth directions of the racks are opposite, and meanwhile, the teeth of the racks vertically extend along the length direction of the racks.
The shell is provided with a plurality of wiring components 11, each wiring component 11 penetrates through the inner side and the outer side of the shell, and the wiring components 11 are provided with fixing screws or bolts. Specifically, the wiring member 11 may be connected to each of the contacts through a wire, and connected to a wiring wire outside the housing, and meanwhile, the wiring member penetrates through the wiring manner of the housing main body, and also effectively prevents dust and the like from entering the inside of the housing. The wiring member 11 protruding out of the housing main body is provided with a fixing screw, so that external equipment can be fixedly connected with the wiring member 11, and the effect of controlling conversion is achieved.
The controller 10 is provided with a shield 16 at its outer periphery. Specifically, the controller 10 is provided with a shielding cover 16 at the periphery thereof, which can ensure that the controller 10 is not affected by static electricity in the outer wires, and at the same time, can reduce the influence of the conduction between the currents between the contacts on the controller 10. In addition, since the controller 10 is a control center of the entire apparatus, control accuracy determines the effect of control, it is necessary to ensure that the controller 10 is not affected by other components on the periphery. In addition, the controller 10 is connected with each first travel switch 7 and the driving mechanism in the housing main body through wires, so that the first movable plate and the second movable plate can transmit control signals to the controller when abutting against each travel switch, and the controller can control the rotation of the driving mechanism after receiving the control signals, thereby realizing the conversion of the change-over switch.
The first contact 4, the second contact 5, the third contact 3, and the fourth contact 6 are electrically connected to the corresponding wiring members 11 by wires, respectively. Specifically, the first contact 4, the second contact 5, the third contact 3, and the fourth contact 6 are respectively connected to each of the wiring members 11 through wires, so that the control effect of the change-over switch is ensured, and each contact is rapidly switched on after being touched. In addition, the first contact 4 and the second contact 5 are connected to the same connection terminal together, that is, the first contact 4 and the second contact 5 are contacts of the same contact terminal at different positions, and the contacts are placed at different positions, so that the control of the change-over switch is more convenient. Simultaneously, first contact 4 is the semicircle arch, third contact 3 is the semicircle recess, first contact 4 with third contact 3 is just to matching the contact, when the contact, the arc surface of first contact 4 with the surface of third contact 3 closely laminates, guarantees that the contact effect through electric current or voltage above that reaches the best. In addition, the second contact 5 is also formed as a semicircular arc protrusion, the fourth contact 6 is formed as a semicircular arc groove, and the first contact 4 and the third contact 3 are in opposite matching contact with each other. When the second contact head 5 contacts with the fourth contact head 6, the arc surface of the second contact head 5 is tightly attached to the outer surface of the fourth contact head 6, so that the conduction effect between the second contact head 5 and the fourth contact head 6 is optimal.
Four end corners of the control panel are respectively provided with a fixing hole 15. Specifically, the control panel can be fixed on the housing through screws or bolts through the fixing holes 15, so that the control panel can rapidly control the controlled device.
The control panel is also provided with a switching button 13, a locking button 14, a first movable plate state indicator lamp 12 and a second movable plate state indicator lamp 18. Concretely, each control button that is equipped with on the control panel can control change over switch, change over button 13 and first movable plate state pilot lamp 12 correspond the setting, work as change over button 13 back of pressing, first movable plate will rise, reach appointed position after, support first travel switch 7, at this moment, first movable plate state pilot lamp 12 that corresponds will light, indicate the current state of operating personnel first movable plate leaves behind the fixed plate, first movable plate state pilot lamp 12 will close. Similar to the working process of the first movable plate, when the second movable plate is far away from the fixed plate, the first movable plate gradually approaches the fixed plate from the state of the abutting limiting part 9, and meanwhile, the second movable plate also gradually approaches the abutting part toward the second travel switch 8. When the second movable plate is fully abutted against the second travel switch 8, the first movable plate is just abutted against the first travel switch 7. When the second movable plate is separated from the fixed plate, the status indicator light 18 of the second movable plate is turned on and turned off.
The locking button 14 controls a locking device 17 to lock up the up and down movement of the racks of the first movable plate and the second movable plate. Specifically, after the first movable plate and the second movable plate are tightly attached to the fixed plate, the locking button locks the racks 2 of the first movable plate and the second movable plate to the control locking device 17, so as to prevent the racks from moving and deviating.
Insulating layers are arranged between the first movable plate and the second movable plate and on the two sides of the first movable plate and the second movable plate, close to the inner wall of the shell. Specifically, the insulating layer can prevent the first movable plate and the second movable plate from influencing each other, and simultaneously, the insulating layer of the first movable plate, the second movable plate and the shell on two sides can also prevent the main body of the shell from being electrified and causing harm to operators. In addition, each insulating layer can ensure that no electric arc is generated between the electrodes on the first movable plate and the second movable plate and mutual interference between the first movable plate and the second movable plate is caused.
And an insulating layer is arranged on the fixing plate close to the inner wall side of the shell. Specifically, the fixed plate and the insulating layer of the shell main body can also prevent the shell from being electrified to cause harm to operators. And the shell main body is also ensured to be electrically connected, so that the safety of the change-over switch can be improved.
The controller 10 controls the driving mechanism to rotate forward and backward. Specifically, the driving mechanism can realize the up-and-down movement of the first movable plate and the second movable plate by forward-and-backward rotation, and the first movable plate and the second movable plate are engaged with the same gear 1 through a rack, so that when the driving mechanism drives the gear 1 to rotate, the movement states of the first movable plate and the second movable plate are opposite, that is, when the first movable plate rises, the second movable plate moves down, and when the change-over switch is in the working state, one of the first movable plate and the second movable plate is in the conducting state.
The utility model discloses a working process: when the present invention is required to be used for switching control, one of the first movable plate and the second movable plate is in a conductive contact state with the fixed plate, and in this case, when the first movable plate is in a conductive state, the locking button 14 is firstly pressed on the control panel, and then the change-over switch 13 is pressed on the control panel, at this time, the locking device 17 is firstly released from the locking state with the rack 2, and the driving structure drives the gear 1 only after the change-over switch 13 is pressed. The first movable plate is driven by the driving mechanism to be in contact with the fixed plate to be in a far-away state, and in the process of the movement, the corresponding first movable plate control indicator lamp 12 is closed to indicate the current state of an operator. In the process that the first movable plate is far away from the fixed plate, the second movable plate is gradually close to the fixed plate, and when the first movable plate abuts against the limiting member 9 and the second travel switch 8, the second movable plate also abuts against the fixed plate, that is, the first travel switch 7. At this time, the corresponding second flap control indicator 18 will light up to indicate the current status of the operator. Meanwhile, the first travel switch 7 and the second travel switch 8 both send a control signal to the controller 10, and the controller 10 controls the driving action of the driving mechanism after receiving the control signal. After the switching operation is completed, the controller 10 automatically controls the locking device 17 to lock the rack 2.
In the other switching process, the locking button 14 is firstly pressed on the control panel, then the switch 13 is pressed on the control panel, at this time, the locking device 17 firstly releases the locking state with the rack 2, and the driving structure drives the gear 1 after the switch 13 is pressed. At this time, the second movable plate is driven by the driving mechanism to move from the state of contacting with the fixed plate to the state of being away from the fixed plate, and during the movement, the control indicator lamp 18 of the corresponding second movable plate is turned off to indicate the current state of the operator. In the process that the second movable plate is far away from the fixed plate, the first movable plate is gradually close to the fixed plate, and when the second movable plate abuts against the limiting member 9 and the second travel switch 8, the first movable plate also abuts against the fixed plate, that is, the first movable plate abuts against the first travel switch 7. At this time, the control indicator 12 of the corresponding first movable plate is lighted up to indicate the current status of the operator. Meanwhile, the first travel switch 7 and the second travel switch 8 both send a control signal to the controller 10, and the controller 10 controls the driving action of the driving mechanism after receiving the control signal. After the switching operation is completed, the controller 10 automatically controls the locking device 17 to lock the rack 2.
In summary, the lifting type change-over switch of the present embodiment adopts a lifting type structure driven by a driving mechanism, so that the conversion efficiency can be improved; the sealed shell design is adopted, so that the normal use can be ensured under the condition of avoiding severe environment; the design that different contact heads are separated is adopted, so that the electrostatic action of the different contact heads or the influence of electric arcs among the different contact heads can be reduced to the maximum extent; and the controller is also adopted to cooperatively control all actions, so that a high-efficiency conversion effect is realized.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A lifting change-over switch comprises a shell main body, a control panel, a fixed plate, a movable plate and a controller, and is characterized in that the fixed plate is abutted against the inner wall of the shell main body, a first contact head (4), a second contact head (5) and a plurality of first travel switches are respectively arranged on the fixed plate, the first contact head (4) and the second contact head (5) are both arranged on one side facing the movable plate, the first contact head (4) and the second contact head (5) are respectively and symmetrically arranged, each first travel switch (7) is arranged on one side facing the movable plate, the movable plate comprises a first movable plate and a second movable plate, a third contact head (3) is arranged at the position of the first movable plate corresponding to the first contact head (4), a fourth contact head (6) is arranged at the position of the second movable plate corresponding to the second contact head (5), the first movable plate and the second movable plate are fixedly connected with a rack (2) and meshed with the same gear, the gear is connected with a driving mechanism and driven by the driving mechanism to rotate, and a controller (10) is arranged in the shell main body;
the lifting change-over switch further comprises a limiting column (9) and a second travel switch (8), the limiting column (9) and the second travel switch (8) are arranged in parallel and level, the second movable plate is far away from the fixed plate, the first movable plate is gradually close to the fixed plate, and when the second movable plate is abutted to the limiting column (9) and the second travel switch (8), the first movable plate is abutted to the first travel switch (7).
2. The lifting type transfer switch according to claim 1, wherein the housing is provided with a plurality of wiring members (11), each wiring member (11) penetrates through the inner and outer sides of the housing, and the wiring members (11) are provided with fixing screws or bolts.
3. The elevating transfer switch of claim 1, wherein the controller is provided with a shield (16) around its periphery.
4. A lifting diverter switch according to claim 2, characterized in that the first contact (4), the second contact (5), the third contact (3) and the fourth contact (6) are each electrically conductively connected to a respective one of the connection members (11) by means of a conductor.
5. The up-down type transfer switch according to claim 1, wherein the four corners of the control panel are respectively provided with fixing holes (15).
6. The lifting type transfer switch of claim 1, wherein the control panel is further provided with a transfer button (13), a locking button (14), a first movable plate status indicator lamp (12) and a second movable plate status indicator lamp (18).
7. The elevating type changeover switch according to claim 6, wherein the locking button (14) controls a locking means (17) to lock up the up and down movement of the racks of the first movable plate and the second movable plate.
8. The elevating type transfer switch as claimed in claim 1, wherein an insulating layer is disposed between the first movable plate and the second movable plate and on both sides of the first movable plate and the second movable plate near the inner wall of the housing.
9. The elevating diverter switch according to claim 1, wherein the fixed plate is provided with an insulating layer on the inner wall side thereof adjacent to the housing.
10. The elevating transfer switch as claimed in any one of claims 1 to 9, wherein the controller controls the driving mechanism to rotate forward and backward.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910152013.3A CN110047664B (en) | 2019-02-28 | 2019-02-28 | Lifting change-over switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910152013.3A CN110047664B (en) | 2019-02-28 | 2019-02-28 | Lifting change-over switch |
Publications (2)
| Publication Number | Publication Date |
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| CN110047664A CN110047664A (en) | 2019-07-23 |
| CN110047664B true CN110047664B (en) | 2020-12-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910152013.3A Active CN110047664B (en) | 2019-02-28 | 2019-02-28 | Lifting change-over switch |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111243892B (en) * | 2020-01-14 | 2022-07-01 | 维沃移动通信有限公司 | Electronic device |
| CN112435874B (en) * | 2020-03-26 | 2023-07-28 | 深圳市卡贝电子技术有限公司 | Electronic switch with large current flux and manufacturing method |
| CN113539706B (en) * | 2020-04-16 | 2022-05-13 | 领航产业技术研究院(山东)有限公司 | High-voltage power distribution cabinet switch structure |
| CN111900027B (en) * | 2020-07-30 | 2022-07-26 | 晨诺电气科技集团有限公司 | Lockable multi-interface isolating switch |
| CN112017875B (en) * | 2020-08-23 | 2023-02-24 | 国网山东省电力公司莱芜供电公司 | Control device of high-voltage switch |
| CN113707474B (en) * | 2021-10-28 | 2022-03-01 | 江苏恒鹏智能电气有限公司 | Electric misoperation prevention device |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202178158U (en) * | 2011-08-22 | 2012-03-28 | 南京久驰机电实业有限公司 | Button switch device |
| CN203456945U (en) * | 2013-09-25 | 2014-02-26 | 浙江寺崎电气有限公司 | Double power supply shifting switch |
| KR101601910B1 (en) * | 2014-08-27 | 2016-03-10 | 윤여관 | Switching Device for Contact Breaker providing safety function of On Mode change |
| CN205282310U (en) * | 2015-11-20 | 2016-06-01 | Asco电力技术公司 | Switch's transmission and have this transmission's switch |
| CN205920891U (en) * | 2016-06-28 | 2017-02-01 | 山东达驰电气有限公司 | Off circuit tap changer for grounding transformer |
| CN107546057A (en) * | 2016-10-19 | 2018-01-05 | 河南众联云科工程技术有限公司 | Open disconnecting switch |
| CN208478182U (en) * | 2017-01-12 | 2019-02-05 | 天津市先智电气设备有限公司 | Lift dual power supply device with mechanical interlocking |
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2019
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