阅读说明：本技术 隔离接地刀闸 (Isolation grounding knife switch ) 是由 许金友 樊帆 曾谷元 钟炜锋 于 2021-08-23 设计创作，主要内容包括：本发明提供了一种隔离接地刀闸,包括：触头组件,触头组件包括动触头和多个静触头,多个静触头包括馈线静触头和接地静触头,动触头活动设置,并具有与馈线静触头接触的合闸位置、与接地静触头接触的接地位置、以及与馈线静触头和接地静触头均不接触的分闸位置；机构组件,机构组件与触头组件驱动连接,且二者之间可分离设置,机构组件能够带动、控制动触头在各静触头之间切换,机构组件位于触头组件的前方,并且避让触头组件的动触头和静触头的正前方。本发明解决了现有技术中的三工位隔离接地刀闸的安全性低的问题。(The invention provides an isolation grounding switch, comprising: the contact assembly comprises a moving contact and a plurality of fixed contacts, the plurality of fixed contacts comprise a feeder line fixed contact and a ground fixed contact, and the moving contact is movably arranged and is provided with a switching-on position in contact with the feeder line fixed contact, a ground position in contact with the ground fixed contact and a switching-off position which is not in contact with both the feeder line fixed contact and the ground fixed contact; the mechanism component is in driving connection with the contact component and is arranged separately from the contact component, the mechanism component can drive and control the moving contact to switch between the static contacts, and the mechanism component is located in front of the contact component and avoids the moving contact of the contact component and the dead ahead of the static contacts. The invention solves the problem of low safety of the three-station isolation grounding disconnecting link in the prior art.)

1. An isolated grounding switch, comprising:

the contact assembly (10) comprises a moving contact (11) and a plurality of fixed contacts, the fixed contacts comprise a feeder line fixed contact (12) and a ground fixed contact (13), the moving contact (11) is movably arranged and is provided with a switch-on position contacted with the feeder line fixed contact (12), a ground position contacted with the ground fixed contact (13) and a switch-off position not contacted with the feeder line fixed contact (12) and the ground fixed contact (13);

the mechanism assembly (20) is in driving connection with the contact assembly (10) and is arranged in a separable mode, the mechanism assembly (20) can drive and control the movable contact (11) to be switched between the fixed contacts, and the mechanism assembly (20) is located in front of the contact assembly (10) and is arranged right in front of the movable contact (11) and the fixed contacts of the contact assembly (10).

2. The isolation and grounding knife switch of claim 1, wherein the contact assembly (10) further comprises a main mounting plate (14), the movable contact (11) and the fixed contact are both disposed on the main mounting plate (14), the mechanism assembly (20) comprises an auxiliary mounting plate (21), the main mounting plate (14) and the auxiliary mounting plate (21) are disposed in parallel and spaced apart, and the movable contact (11) and the fixed contact are located outside a projection range of the auxiliary mounting plate (21) on the main mounting plate (14).

3. The isolated earthing switch of claim 2, characterized in that said auxiliary mounting plate (21) is located in the upper region of said main mounting plate (14) and above said movable contact (11) and said stationary contact.

4. The isolated grounding knife switch of claim 2, characterized in that the surface size of the secondary mounting plate (21) is smaller than the surface size of the main mounting plate (14).

5. The isolation grounding disconnecting link according to claim 2, wherein the contact assembly (10) further comprises a main shaft (15), the main shaft (15) is arranged on the main mounting plate (14) in a penetrating manner and is in driving fit with the movable contact (11), the mechanism assembly (20) comprises a driving part (22) and a connecting shaft (23), the connecting shaft (23) is arranged on the auxiliary mounting plate (21) in a penetrating manner and is in driving connection with the main shaft (15), the driving part (22) drives the movable contact (11) to rotate through the connecting shaft (23) and the main shaft (15), and the main shaft (15) and the connecting shaft (23) are arranged in a separable manner.

6. The isolated grounding knife switch of claim 1, wherein the mechanism assembly (20) comprises:

a drive member (22);

the connecting shaft (23) is used for driving the movable contact (11) to move, and the connecting shaft (23) is in driving connection with the driving piece (22);

the driving control switch (24), the driving control switch (24) is electrically connected with the driving part (22), and can control the driving part (22) to start and stop;

an auxiliary node switch (25), the auxiliary node switch (25) cooperating with an external component;

the driving control cam (26) is used for triggering the driving control switch (24), the driving control cam (26) is in driving connection with the connecting shaft (23), and the driving control cam and the connecting shaft rotate synchronously;

an auxiliary node cam (27) for triggering the auxiliary node switch (25), wherein the auxiliary node cam (27) is in driving connection with the connecting shaft (23) and rotates synchronously with the connecting shaft, and the width of the triggering end of the auxiliary node cam (27) is larger than that of the triggering end of the driving control cam (26), so that the action of triggering the auxiliary node switch (25) by the auxiliary node cam (27) is prior to the action of triggering the driving control switch (24) by the driving control cam (26).

7. The isolated earthing knife-switch of claim 6, characterized in that the width of the trigger end of said auxiliary node cam (27) is 15-25% greater than the width of the trigger end of said drive control cam (26).

8. The isolation earthing switch of claim 1, wherein the mechanism assembly (20) includes a connecting shaft (23) for driving the movable contact (11) to move, a first limiting member (28) and a middle limiting member (29), the first limiting member (28) is connected to the connecting shaft (23) and rotates synchronously with the connecting shaft (23), the first limiting member (28) is provided with a limiting hole (281), the middle limiting member (29) has a limiting end, when the movable contact (11) is located at the switch-off position, the limiting hole (281) is aligned with the limiting end, and the limiting end can extend into the limiting hole (281) to keep the movable contact (11) at the switch-off position.

9. The isolated earthing knife-switch of claim 8, characterized in that said intermediate limiting assembly (29) comprises:

a mount (291);

the marble (292) is movably arranged on the base (291) in a penetrating mode, the marble (292) is provided with a limiting end, and the limiting end is arc-shaped and can extend out of the base (291) to extend into the limiting hole (281);

the elastic piece (293) is arranged in the base (291), two ends of the elastic piece (293) are respectively abutted to the base (291) and the marble (292), and the marble (292) is provided with elastic force extending into the limiting hole (281).

10. The isolation grounding knife switch of claim 8, wherein the mechanism assembly (20) further comprises an end stopper (210), the end stopper (210) is located on a rotation path of the first stopper (28), and when the movable contact (11) rotates to the switch-on position or the grounding position, the first stopper (28) abuts against the end stopper (210) to control a rotation range of the movable contact (11).

11. The isolation grounding knife-switch of claim 1, wherein the plurality of fixed contacts further comprises an intermediate fixed contact (16), along a movement trajectory of the movable contact (11), the intermediate fixed contact (16) is located between the feeder fixed contact (12) and the grounding fixed contact (13), and the movable contact (11) is in contact with the intermediate fixed contact (16) when the movable contact (11) is located at the switch-off position.

12. The isolated grounding knife switch of claim 1, wherein the mechanism assembly (20) comprises:

the connecting shaft (23) is in driving fit with the moving contact (11), and the connecting shaft (23) and the moving contact rotate synchronously;

a first manual shaft (220), wherein the first manual shaft (220) is in driving connection with the connecting shaft (23);

the second manual shaft (230), the second manual shaft (230) is connected with the connecting shaft (23) in a driving way;

a crank (240), wherein the crank (240) can be matched with the first manual shaft (220) or the second manual shaft (230), and the movable contact (11) is driven to switch positions by the first manual shaft (220) or the second manual shaft (230);

the second limiting piece (250) is connected with the connecting shaft (23) and synchronously rotates with the connecting shaft, the second limiting piece (250) can shield or avoid the front of the first manual shaft (220) or the second manual shaft (230) so as to prevent or avoid the crank (240) from being butted with the first manual shaft (220) or the second manual shaft (230), when the movable contact (11) is located at the switching-on position, the second limiting piece (250) avoids the first manual shaft (220) and shields the second manual shaft (230), the crank (240) can be in driving connection with the first manual shaft (220), and the movable contact (11) is driven by the first manual shaft (220) to be switched from the switching-on position to the switching-off position; when the movable contact (11) moves to the brake-off position, the second limiting member (250) abuts against the crank (240) and blocks the crank (240) from driving the movable contact (11) to continue rotating, the second limiting member (250) avoids the second manual shaft (230), the crank (240) can be switched from the first manual shaft (220) to the second manual shaft (230), and the second manual shaft (230) drives the movable contact (11) to be switched from the brake-off position to the grounding position.

13. The isolated grounding knife switch of claim 12, characterized in that the second limiting member (250) is provided with a first avoiding recess (2501) and a second avoiding recess (2502), the first avoiding recess (2501) is used for avoiding the first manual shaft (220), the second avoiding recess (2502) is used for avoiding the second manual shaft (230), when the movable contact (11) moves to the opening position, a side wall of the first avoiding recess (2501) abuts against the crank handle (240) and prevents the movable contact (11) from continuing to rotate, and the second avoiding recess (2502) is aligned with the second manual shaft (230) so that the crank handle (240) can be switched from the first manual shaft (220) to the second manual shaft (230).

14. The isolated grounding knife switch of claim 13, wherein a distance between the first avoidance recess (2501) and the second avoidance recess (2502) is equal to a distance between the first manual shaft (220) and the second manual shaft (230).

15. The isolation grounding knife switch of claim 12, wherein the second limiting member (250) further has a stopping portion (2503), when the moving contact (11) is driven by the crank (240) to move to the grounding position, the stopping portion (2503) abuts against the crank (240) and prevents the crank (240) from driving the moving contact (11) to rotate continuously.

16. The isolated grounding knife switch of claim 12, wherein the mechanism assembly (20) further comprises:

a drive member (22);

a speed reducing mechanism (260), wherein the speed reducing mechanism (260) is in driving connection with the driving piece (22);

the transmission mechanism (270), the transmission mechanism (270) with the reduction mechanism (260) with connecting axle (23) drive connection, driving piece (22) pass through the reduction mechanism (260) with transmission mechanism (270) drive connecting axle (23) rotate.

17. The isolated grounding knife switch of claim 1, wherein the contact assembly (10) further comprises:

the moving contact (11) and the fixed contact are both arranged on the main mounting plate (14);

the insulator (17) is arranged between the main mounting plate (14) and the moving contact (11) and the static contact;

the main shaft (15), the said main shaft (15) is worn and set up on the said main mounting plate (14), and cooperate with drive of the said mechanism assembly (20);

the crank connecting rod mechanism comprises a crank (18) and a connecting rod (19), the crank (18) is in driving connection with the main shaft (15) and rotates synchronously, and two ends of the connecting rod (19) are respectively connected with the crank (18) and the movable contact (11) to drive the movable contact (11) to rotate.

Technical Field

The invention relates to the technical field of rail transit, in particular to an isolation grounding disconnecting link.

Background

Before the rail transit is overhauled, the isolation disconnecting link needs to be disconnected, and then the grounding disconnecting link is switched on after electricity testing. Similarly, after the maintenance is completed, the grounding switch needs to be disconnected first, then the switch is closed and the isolation switch is isolated, and then the subsequent power transmission work can be performed. Therefore, the cooperation operation of the isolation switch and the grounding switch is related. At present, the cooperation of the isolation switch and the grounding switch, which is common in the industry, includes the following situations:

1. the isolation switch cabinet + the grounding cabinet, namely the isolation switch and the grounding switch are respectively positioned in different cabinet bodies and are arranged at different positions. Under the condition, the construction cost is higher, and the operation of different positions of the isolation disconnecting link and the grounding disconnecting link is inconvenient.

2. The isolation grounding disconnecting link, namely the isolation grounding integrated disconnecting link, is driven by two moving contacts under the drive of two motors to respectively realize the actions of isolation and grounding. Compared with the mode of the isolation switch cabinet and the grounding cabinet, the isolation and grounding integrated control is realized, the two cabinet body devices are combined into one cabinet body device, the application of one cabinet body device is reduced, and the integration is relatively higher.

At present, with the development of science and technology, the requirement for the integration of isolation and grounding is further provided in the field of rail transit. Namely, a moving contact (11) realizes the operation of two processes of isolation and grounding under the action of a motor. Through the design of the three-station isolation grounding disconnecting link, the mechanism is simplified, the cost is lower, and the reliability is higher. At present, products of three-station isolation grounding knife switches appear on the market. Although these products can achieve the isolation grounding, the following problems exist in the design layout of the whole knife switch:

1) a three-position isolation earthing switch is a primary + secondary device, the primary including a contact part, which is generally a high voltage region, the voltage grade being different according to the voltage grade of rail traffic, such as DC750V, DC1500V, DC3000V, etc. The secondary equipment comprises a control mechanism for the movement of the knife gate, an auxiliary node switch and the like. At present, most three-station disconnecting switches in the market are designed into a whole in a primary mode and a secondary mode, a design concept of so-called primary and secondary separation is not provided, and strong and weak currents are not designed in a separation mode, so that signal acquisition and corresponding signal control of secondary equipment are influenced;

2) the three-station disconnecting link in the current market is designed into a whole for the primary and the secondary, once an operator carries out maintenance or secondary equipment operations such as wiring acquisition auxiliary nodes and the like, the operator always faces the high-voltage risk of a primary contact, and the operator is bound to have psychological fear and certain potential safety hazard;

3) failure of the knife switch product typically occurs in the operating mechanism portion. The field maintenance time is short, and is usually only 2-3 hours. Three station switches on the existing market do not carry out the disconnect-type design, and the switch is dismantled to after-sales intelligence whole, including once contact and mechanism, still must dismantle the cable of being connected with the contact simultaneously. Once the cable is disassembled, the power failure must be required to be carried out on site, so that the maintenance requirement is higher, and the problem cannot be quickly and flexibly solved;

4) meanwhile, in the three-station disconnecting link in the current market, the operating mechanism and the disconnecting link contact part are designed in a front-back layout mode, and the middle of the three-station disconnecting link is separated by a partition plate. The operator can not see the contact state of the disconnecting link from the front, the adopted means is that an observation port is usually arranged on a middle partition plate between an operating mechanism and a disconnecting link contact, and the observation port is small because devices related to the mechanism are fully distributed in the middle, so that the operator is inconvenient to observe the state of the disconnecting link. Or the side of the cabinet body is directly windowed, so that an operator can only observe from the side.

Disclosure of Invention

The invention mainly aims to provide an isolation grounding switch to solve the problem that the safety of a three-station isolation grounding switch in the prior art is low.

In order to achieve the above object, the present invention provides an isolated grounding switch, comprising: the contact assembly comprises a moving contact and a plurality of fixed contacts, the plurality of fixed contacts comprise a feeder line fixed contact and a ground fixed contact, and the moving contact is movably arranged and is provided with a switching-on position in contact with the feeder line fixed contact, a ground position in contact with the ground fixed contact and a switching-off position which is not in contact with both the feeder line fixed contact and the ground fixed contact; the mechanism component is in driving connection with the contact component and is arranged separately from the contact component, the mechanism component can drive and control the moving contact to switch between the static contacts, and the mechanism component is located in front of the contact component and avoids the moving contact of the contact component and the dead ahead of the static contacts.

Further, the contact assembly further comprises a main mounting plate, the moving contact and the fixed contact are both arranged on the main mounting plate, the mechanism assembly comprises an auxiliary mounting plate, the main mounting plate and the auxiliary mounting plate are arranged in parallel at intervals, and the moving contact and the fixed contact are located outside the projection range of the auxiliary mounting plate on the main mounting plate.

Further, the auxiliary mounting plate is located in the upper region of the main mounting plate and is located above the movable contact and the fixed contact.

Further, the surface size of the sub-mounting plate is smaller than the surface size of the main mounting plate.

Further, the contact assembly further comprises a main shaft, the main shaft penetrates through the main mounting plate and is matched with the moving contact in a driving mode, the mechanism assembly comprises a driving piece and a connecting shaft, the connecting shaft penetrates through the auxiliary mounting plate and is connected with the main shaft in a driving mode, the driving piece drives the moving contact to rotate through the connecting shaft and the main shaft, and the main shaft and the connecting shaft can be arranged in a separated mode.

Further, the mechanism assembly includes: a drive member; the connecting shaft is used for driving the moving contact to move and is in driving connection with the driving piece; the driving control switch is electrically connected with the driving piece and can control the driving piece to start and stop; an auxiliary node switch cooperating with the external component; the driving control cam is used for triggering the driving control switch, is in driving connection with the connecting shaft and synchronously rotates; and the width of the trigger end of the auxiliary node cam is greater than that of the drive control cam, so that the action of triggering the auxiliary node switch by the auxiliary node cam is prior to the action of triggering the drive control switch by the drive control cam.

Further, the width of the trigger end of the auxiliary node cam is 15-25% larger than that of the drive control cam.

Further, the mechanism assembly comprises a connecting shaft, a first limiting part and a middle limiting part, the connecting shaft is used for driving the moving contact to move, the first limiting part is connected with the connecting shaft, the first limiting part and the connecting shaft rotate synchronously, the first limiting part is provided with a limiting hole, the middle limiting part is provided with a limiting end, when the moving contact is located at a brake separating position, the limiting hole is aligned with the limiting end, and the limiting end can stretch into the limiting hole so as to keep the moving contact at the brake separating position.

Further, the middle spacing subassembly includes: a base; the marble is movably arranged on the base in a penetrating way and is provided with a limiting end, and the limiting end is arc-shaped and can extend out of the base to extend into the limiting hole; elastic component, elastic component set up in the base, the both ends of elastic component respectively with base and marble butt to for the marble provides the elasticity that stretches into spacing hole.

Further, the mechanism assembly further comprises an end limiting block, the end limiting block is located on a rotating path of the first limiting block, and when the moving contact rotates to a switching-on position or a grounding position, the first limiting block is abutted against the end limiting block to control the rotating range of the moving contact.

Furthermore, the plurality of fixed contacts further comprise a middle fixed contact, the middle fixed contact is located between the feeder line fixed contact and the grounding fixed contact along the movement track line of the moving contact, and when the moving contact is located at the switch-off position, the moving contact is in contact with the middle fixed contact.

Further, the mechanism assembly includes: the connecting shaft is in driving fit with the moving contact and synchronously rotates; the first manual shaft is in driving connection with the connecting shaft; the second manual shaft is in driving connection with the connecting shaft; the crank can be matched with the first manual shaft or the second manual shaft and drives the moving contact to switch positions through the first manual shaft or the second manual shaft; the second limiting part can shield or avoid the front of the first manual shaft or the second manual shaft so as to block or avoid the crank from being in butt joint with the first manual shaft or the second manual shaft, when the moving contact is located at a switching-on position, the second limiting part avoids the first manual shaft and shields the second manual shaft, the crank can be in driving connection with the first manual shaft, and the moving contact is driven by the first manual shaft to be switched from the switching-on position to the switching-off position; when the moving contact moved to the separating brake position, second locating part and crank butt to hinder the crank to drive the moving contact and continue to rotate, and the second locating part dodges the manual axis of second, and the crank can be switched to the manual axis of second by first manual axis, and drive the moving contact through the manual axis of second and switch to ground position by separating brake position.

Furthermore, the second limiting part is provided with a first avoidance concave part and a second avoidance concave part, the first avoidance concave part is used for avoiding the first manual shaft, the second avoidance concave part is used for avoiding the second manual shaft, when the movable contact moves to the opening position, the side wall of the first avoidance concave part is abutted to the crank and prevents the movable contact from continuing to rotate, and the second avoidance concave part is aligned to the second manual shaft so that the crank can be switched to the second manual shaft by the first manual shaft.

Further, a distance between the first avoidance concave portion and the second avoidance concave portion is equal to a distance between the first manual shaft and the second manual shaft.

Furthermore, the second locating part is also provided with a stopping part, and when the crank drives the moving contact to move to the grounding position, the stopping part is abutted against the crank and prevents the crank from driving the moving contact to continue rotating.

Further, the mechanism assembly further comprises: a drive member; the speed reducing mechanism is in driving connection with the driving piece; and the transmission mechanism is in driving connection with the speed reducing mechanism and the connecting shaft, and the driving piece drives the connecting shaft to rotate through the speed reducing mechanism and the transmission mechanism.

Further, the contact assembly further comprises: the moving contact and the static contact are arranged on the main mounting plate; insulators are arranged between the moving contact and the main mounting plate and between the fixed contact and the main mounting plate; the main shaft penetrates through the main mounting plate and is in driving fit with the mechanism assembly; the crank connecting rod mechanism comprises a crank and a connecting rod, the crank is in driving connection with the main shaft and synchronously rotates with the main shaft, and two ends of the connecting rod are respectively connected with the crank and the moving contact to drive the moving contact to rotate.

By applying the technical scheme of the invention, the contact assembly and the mechanism assembly are in a modularized separation type design, so that the two parts form two relatively independent assemblies, the disassembly and the assembly can be quickly realized during the assembly, and the replacement of a fault mechanism can be quickly realized on site. Due to the modularized separation type design, the contact assembly and the mechanism assembly can be independently operated as required, when in subsequent maintenance and other operations, maintenance personnel only need to disassemble the mechanism assembly, the contact assembly and related cables which are disassembled once are not needed, the safety of personnel operation is improved, and the mechanism assembly which can be rapidly replaced, the maintenance and the overhaul of the knife gate product can be rapidly realized, meanwhile, the mechanism assembly can be replaced in a live state on site, the power-off treatment of the knife gate is not needed, and therefore the normal use is not influenced. Simultaneously, the mechanism subassembly setting of this embodiment is in the place ahead of contact subassembly, and the mode of the disconnect-type design of cooperation contact subassembly and mechanism subassembly for whole switch can install the contact subassembly of once in the primary chamber when the installation, and the secondary mechanism unit mount is in the secondary chamber, and maintainer is when maintaining or wiring collection auxiliary node, only need open the secondary chamber can, need not to face the contact subassembly in high-voltage area, makes the design of isolation ground connection switch safer, more reliable. In addition, the mechanism assembly avoids the dead ahead of the contact assembly, so that the mechanism assembly can not shield the contact assembly when the contact assembly is separated from the mechanism assembly, an operator can easily observe the switching-on and switching-off condition of the contact assembly, and the problem that the operator cannot observe the state of the contact because the contact part is shielded is solved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 shows a schematic structural diagram of an isolated grounding knife-switch of the present invention;

FIG. 2 is a schematic diagram of the contact assembly of the isolated grounding switch of FIG. 1;

FIG. 3 is a schematic structural diagram of the mechanism assembly of the isolated grounding switch of FIG. 1;

FIG. 4 shows a schematic structural view of the back side of the mechanism assembly of FIG. 1;

fig. 5 shows a schematic structural diagram of the isolated grounding knife switch in fig. 1 when closing;

FIG. 6 is a schematic structural diagram of the isolation grounding knife switch in FIG. 1 during switching off;

FIG. 7 is a schematic diagram of the isolated grounding knife-switch of FIG. 1 when grounded;

FIG. 8 shows a side view of the isolated grounding switch of FIG. 1;

FIG. 9 is a schematic structural diagram illustrating the driving connection between the main shaft and the connecting shaft of the isolation earthing switch in FIG. 1;

FIG. 10 is an exploded view of a portion of the structure of the mechanism components of the isolated grounding switch of FIG. 1;

FIG. 11 is a schematic diagram showing the magnitude relationship between the drive control cam and the subsidiary node cam of FIG. 10;

fig. 12 is a schematic structural diagram illustrating the middle limiting component of the isolated grounding switch in fig. 1 being matched with the first limiting component;

fig. 13 is a schematic structural diagram of the first limiting member in fig. 12;

FIG. 14 shows a schematic structural view of the intermediate stop assembly of FIG. 12;

fig. 15 is a schematic structural diagram illustrating a second limiting member of the isolation grounding switch in fig. 1;

fig. 16 is a schematic structural diagram illustrating the isolated grounding switch of fig. 1 with the crank coupled to the first manual shaft when the switch is closed;

fig. 17 is a schematic structural diagram illustrating that the crank of the isolated earthing knife-switch in fig. 1 abuts against the first avoiding concave part when the switch is opened;

fig. 18 shows a schematic view of the isolated earthing switch of fig. 1 with the crank switched to the second manual axis;

fig. 19 is a schematic structural view showing the isolated grounding knife switch in fig. 1, wherein the crank is abutted against the stop part when the isolated grounding knife switch is grounded;

FIG. 20 is a schematic view of the structure of the driving member of the isolated grounding knife switch in FIG. 1 cooperating with the speed reducing mechanism and the transmission mechanism;

fig. 21 is a schematic structural diagram illustrating the first and second manual shafts of the isolation earthing knife-switch in fig. 1 being engaged with the connecting shaft.

Wherein the figures include the following reference numerals:

10. a contact assembly; 11. a moving contact; 12. a feeder line static contact; 13. a grounding static contact; 14. a main mounting plate; 15. a main shaft; 16. a middle static contact; 17. an insulator; 18. a crank; 19. a connecting rod; 20. a mechanism assembly; 21. an auxiliary mounting plate; 22. a drive member; 23. a connecting shaft; 24. a drive control switch; 25. an auxiliary node switch; 26. a drive control cam; 27. an auxiliary node cam; 28. a first limit piece; 281. a limiting hole; 29. a middle limit component; 291. a base; 292. a marble; 293. an elastic member; 210. an end limiting block; 220. a first manual shaft; 230. a second manual shaft; 240. a crank; 250. a second limiting member; 2501. a first avoidance concave portion; 2502. a second avoidance concave portion; 2503. a stopper portion; 260. a speed reduction mechanism; 270. a transmission mechanism; 280. an auxiliary mounting plate; 30. connecting columns.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

In the present invention, unless specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like, generally refer to the orientation as shown in the drawings, or to the component itself in a vertical, perpendicular, or gravitational orientation; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.

The invention provides an isolation grounding disconnecting link, aiming at solving the problem that the safety of a three-station isolation grounding disconnecting link in the prior art is low.

As shown in fig. 1 to 21, an isolation grounding disconnecting link includes a contact component 10 and a mechanism component 20, the contact component 10 includes a moving contact 11 and a plurality of fixed contacts, the plurality of fixed contacts includes a feeder line fixed contact 12 and a grounding fixed contact 13, the moving contact 11 is movably disposed and has a switching-on position contacting the feeder line fixed contact 12, a grounding position contacting the grounding fixed contact 13, and a switching-off position not contacting both the feeder line fixed contact 12 and the grounding fixed contact 13; the mechanism component 20 is connected with the contact component 10 in a driving manner and is arranged separately from the contact component 10, the mechanism component 20 can drive and control the moving contact 11 to switch between the fixed contacts, and the mechanism component 20 is located in front of the contact component 10 and avoids the moving contact 11 and the fixed contacts of the contact component 10 from being in front of each other.

In the embodiment, the modular separation design is adopted for the contact assembly 10 and the mechanism assembly 20, so that the two parts form two relatively independent assemblies, and therefore, the disassembly and the assembly can be quickly realized during the assembly, and the replacement of a fault mechanism can be quickly realized on site. Due to the modularized separated design, the contact assembly 10 and the mechanism assembly 20 can be independently operated as required, when in subsequent maintenance and other operations, a maintainer only needs to disassemble the mechanism assembly 20 without disassembling the contact assembly 10 and related cables once, so that the safety of personnel operation is improved, the mechanism assembly 20 can be rapidly replaced, the maintenance and the overhaul of a knife gate product are rapidly realized, meanwhile, the mechanism assembly 20 can be replaced in an electrified way on site, the power-off treatment of the knife gate is not needed, and the normal use is not influenced. Meanwhile, the mechanism component 20 of the embodiment is arranged in front of the contact component 10, and is matched with the separated design mode of the contact component 10 and the mechanism component 20, so that the primary contact component 10 can be installed in a primary chamber when the whole disconnecting link is installed, the secondary mechanism component 20 is installed in a secondary chamber, and when maintenance personnel perform maintenance or collect auxiliary nodes in a wiring manner, only the secondary chamber needs to be opened, the contact component 10 facing a high-voltage area is not needed, and the design of the isolation grounding disconnecting link is safer and more reliable. In addition, mechanism component 20 has dodged the dead ahead of contact subassembly 10 to when having guaranteed contact subassembly 10 and mechanism component 20 separation, make mechanism component 20 can not shelter from contact subassembly 10, the operator can easily observe the divide-shut brake condition of contact subassembly 10, solved the contact part and sheltered from and make the operator can't observe the problem of contact state.

It should be noted that, in this embodiment, the front and the back are according to the direction when the isolated grounding disconnecting link is normally used, that is, when the maintenance personnel normally use, the direction close to the maintenance personnel is the front, and the direction far away from the maintenance personnel is the back.

As shown in fig. 1 and 2, the contact assembly 10 further includes a main mounting plate 14, the moving contact 11 and the static contact are both disposed on the main mounting plate 14, the static contact of the present embodiment is fixedly disposed on the main mounting plate 14, the moving contact 11 is communicated with a contact network, one end of the moving contact 11 is rotatably disposed on the main mounting plate 14, and the other end of the moving contact 11 can be matched with each static contact. Mechanism subassembly 20 includes vice mounting panel 21, parallel interval sets up between main mounting panel 14 and the vice mounting panel 21, this embodiment is provided with spliced pole 30 between main mounting panel 14 and vice mounting panel 21, pass through fasteners such as bolts between the tip of spliced pole 30 and main mounting panel 14 and the vice mounting panel 21 and be connected, thereby make and connect into a whole between the two, when mechanism subassembly 20 needs to be changed, can dismantle the fastener, can take off vice mounting panel 21 and the part on it is whole, thereby with mechanism subassembly 20 and contact subassembly 10 separation, realize the maintenance of mechanism subassembly 20 and change. In addition, the movable contact 11 and the fixed contact of the present embodiment are located outside the projection range of the auxiliary mounting plate 21 on the main mounting plate 14, so that the auxiliary mounting plate 21 does not shield the movable contact 11 and the fixed contact, so that the maintenance personnel can visually observe the matching relationship between the movable contact 11 and the fixed contact, and the judgment of the state of the isolation grounding disconnecting link is realized.

As shown in fig. 1 and 8, the surface size of the auxiliary mounting plate 21 of the present embodiment is smaller than the surface size of the main mounting plate 14, the auxiliary mounting plate 21 is located in the upper region of the main mounting plate 14, and the movable contact 11 and the fixed contact are located in the middle region and the lower region of the main mounting plate 14, so that the auxiliary mounting plate 21 is located above the movable contact 11 and the fixed contact, and the mechanism assembly 20 is convenient to detach while avoiding the movable contact 11 and the fixed contact. Of course, the position relationship between the auxiliary mounting plate 21 and the main mounting plate 14 and the position relationship between the movable contact 11 and the fixed contact can also be adjusted as required, as long as the mechanism component 20 is ensured to be positioned in front of the main mounting plate 14 and to avoid the movable contact 11 and the fixed contact.

As shown in fig. 2, the contact assembly 10 of the present embodiment includes a main shaft 15, a crank link mechanism and an insulator 17 in addition to the movable contact 11, the stationary contact and the main mounting plate 14. The main shaft 15 penetrates through the main mounting plate 14, the main shaft 15 is in driving connection with the connecting shaft 23 of the mechanism assembly 20, a non-circular protrusion and a non-circular groove are respectively formed in the main shaft 15 and the connecting shaft 23, as shown in fig. 9, the non-circular protrusion extends into the non-circular groove, so that driving connection between the main shaft 15 and the connecting shaft 23 is achieved, the mechanism assembly 20 can drive the main shaft 15 to rotate through the connecting shaft 23, meanwhile, the main shaft 15 and the connecting shaft 23 can be separated through the matching mode, when the mechanism assembly 20 is detached, the non-circular protrusion is separated from the non-circular groove, the main shaft 15 and the connecting shaft 23 can be separated, and therefore the mechanism assembly 20 and the contact assembly 10 can be separated. The crank-link mechanism comprises a crank 18 and a connecting rod 19, one end of the crank 18 is in driving connection with the main shaft 15, the crank 18 and the main shaft 15 rotate synchronously, one end of the connecting rod 19 is connected with one end, far away from the main shaft 15, of the crank 18, the other end of the connecting rod is connected with the middle of the movable contact 11, therefore, when the mechanism assembly 20 drives the main shaft 15 to rotate through the connecting shaft 23, the main shaft 15 drives the crank 18 to rotate, the crank 18 drives the connecting rod 19 to rotate, the connecting rod 19 can drive the movable contact 11 to rotate around one end, and the other end of the connecting rod is matched with each static contact. Insulators 17 are arranged between the moving contact 11 and each fixed contact and the main mounting plate 14, and the insulators 17 can isolate the conduction relation between the moving contact 11 and each fixed contact and the main mounting plate 14, so that the main mounting plate 14 is prevented from being electrified due to the influence of the moving contact 11 and the fixed contacts. Of course, the mating manner between the contact assembly 10 and the mechanism assembly 20 may be changed as desired, such as by using a gear engagement or the like.

The mechanism assembly 20 of this embodiment includes a driving element 22 and a connecting shaft 23, the driving element 22 is a motor and is installed in front of the sub-mounting plate 21, the connecting shaft 23 is inserted into the sub-mounting plate 21 and is drivingly connected to the main shaft 15, and when the movable contact 11 needs to rotate, the driving element 22 drives the movable contact 11 to rotate through the connecting shaft 23 and the main shaft 15.

As shown in fig. 10 and 11, the mechanism assembly 20 of the present embodiment further includes a drive control switch 24, an auxiliary node switch 25, a drive control cam 26 for activating the drive control switch 24, and an auxiliary node cam 27 for activating the auxiliary node switch 25. The driving control switch 24 is electrically connected to the driving member 22 and can control the driving member 22 to start and stop, and when the driving control cam 26 triggers the driving control switch 24, the driving control switch 24 can control the driving member 22 to stop. The auxiliary node switch 25 is engaged with the external member for transmitting the rotational position of the connecting shaft 23 to the external member and determining the state of the isolated earthing switch so that the external member is engaged with the state of the isolated earthing switch. The driving control cam 26 and the auxiliary node cam 27 are sleeved on the connecting shaft 23, and are in driving connection with the connecting shaft 23, and the three rotate synchronously. When the connecting shaft 23 rotates, the driving control cam 26 and the auxiliary node cam 27 on the connecting shaft 23 rotate together, so that when the movable contact 11 rotates to the switching-on position, the grounding position and the switching-off position, the driving control cam 26 and the auxiliary node cam 27 can respectively trigger the driving control switch 24 and the auxiliary node switch 25. And the width of the trigger end of the auxiliary node cam 27 of the present embodiment is larger than that of the drive control cam 26, so that the action of the auxiliary node cam 27 to trigger the auxiliary node switch 25 precedes the action of the drive control cam 26 to trigger the drive control switch 24. The reason for adopting this arrangement is that, during machining, the driving control cam 26 and the auxiliary node cam 27 cannot be completely consistent due to the limitation of the machining process, and there is an error, so that when the connecting shaft 23 rotates, it is difficult for the driving control cam 26 and the auxiliary node cam 27 to simultaneously trigger the driving control switch 24 and the auxiliary node switch 25. When the connecting shaft 23 rotates fast, the influence of the error on the detection is small and can be ignored, and the drive control switch 24 and the auxiliary node switch 25 are almost triggered simultaneously; in a low-temperature environment, since the speed of the driving member 22 is slowed down and the rotation speed of the connecting shaft 23 is slowed down, an error between the driving control cam 26 and the auxiliary node cam 27 is amplified, and it may occur that the driving control switch 24 is triggered before the auxiliary node switch 25, so that the driving member 22 is stopped, and once the driving member 22 is stopped, the auxiliary node cam 27 cannot continuously trigger the auxiliary node switch 25, so that the auxiliary node state acquired in the background is inconsistent with the actual state of the motor, and thus the matching between the external component and the isolation grounding disconnecting link is affected, or even a safety accident occurs. To avoid this, the present embodiment makes the width of the trigger terminal of the auxiliary node cam 27 larger than that of the drive control cam 26, so that the action of the auxiliary node cam 27 to trigger the auxiliary node switch 25 is inevitably prioritized over the action of the drive control cam 26 to trigger the drive control switch 24, thereby ensuring the reliability of the triggering of the auxiliary node switch 25.

Preferably, the width of the active end of the auxiliary node cam 27 is 15-25% greater than the width of the active end of the actuation control cam 26. More preferably 20%, on the premise that the auxiliary node cam 27 is ensured to trigger the auxiliary node switch 25 preferentially, the condition that the auxiliary node switch 25 is damaged due to an excessively large movement distance of the auxiliary node cam 27 is avoided.

The numbers of the drive control switches 24, the auxiliary node switches 25, the drive control cams 26, and the auxiliary node cams 27 may be set accordingly as needed.

As shown in fig. 4 and 12 to 14, in the present embodiment, the mechanism assembly 20 further includes a first limiting member 28, an intermediate limiting member 29 and an end limiting member 210. The first limiting member 28 is disposed on the back of the sub-mounting plate 21, connected to the connecting shaft 23, and rotates synchronously with the connecting shaft, and the first limiting member 28 of the present embodiment is disposed in a fan-shaped structure. In cooperation with the three positions of the movable contact 11, the first limiting member 28 has three positions correspondingly. Specifically, two end limiting blocks 210 are provided, the two end limiting blocks 210 are respectively located on the rotation path of the first limiting block 28 in two directions, when the movable contact 11 rotates to the switch-on position or the grounding position, the first limiting block 28 abuts against the end limiting block 210 to control the rotation range of the movable contact 11, and the position is the limit position of the first limiting block 28, that is, the rotatable limit position of the movable contact 11. And middle spacing subassembly 29 control first locating part 28 and keep between two extreme positions position, spacing hole 281 has been seted up to first locating part 28 of this embodiment, middle spacing subassembly 29 has the spacing end of activity, when the moving contact 11 was located the branch floodgate position, spacing hole 281 aligns with spacing end, spacing end can stretch into to spacing hole 281 in to keep the position of first locating part 28, just also keep the moving contact 11 at the branch floodgate position, realize that the moving contact 11 switches between three positions accurately and reliably.

In this embodiment, middle spacing subassembly 29 includes base 291, marble 292 and elastic component 293, wherein, the mounting hole has been seted up to base 291, marble 292 is the column, and the activity is worn to establish in the mounting hole, the mounting hole can be stretched out to marble 292's one end, thereby stretch into the spacing hole 281 of first locating part 28, this end is as the spacing end of middle spacing subassembly 29 promptly, and this end sets up into the arc, this embodiment sets up to the hemisphere, like this, when moving contact 11 rotates to the minute floodgate position, marble 292 aligns with spacing hole 281, marble 292 can stretch out base 291 and stretch into spacing hole 281 in, realize the stability to first locating part 28 position, make moving contact 11 can stabilize at minute floodgate position and unable random movement. It should be noted that, the limiting effect of the marble 292 on the first limiting member 28 is limited by a certain limit, which does not completely obstruct the movement of the first limiting member 28, in other words, when the movable contact 11 moves from the opening position to the closing position or the grounding position, the connecting shaft 23 drives the first limiting member 28 to rotate, at this time, the first limiting member 28 extrudes the limiting end of the marble 292, and because the limiting end is hemispherical, the limiting end exits the limiting hole 281 under the extrusion of the first limiting member 28, so that the first limiting member 28 is not limited, and the first limiting member 28 can rotate freely. The elastic component 293 of this embodiment adopts the spring, and it sets up in base 291 to the both ends of elastic component 293 respectively with base 291 and marble 292 butt, like this, elastic component 293 makes marble 292 have the elasticity that stretches out base 291 and stretch into spacing hole 281 all the time, makes when moving contact 11 rotates to the separating brake position, and marble 292 can stretch into to spacing hole 281 in under the effect of elastic component 293 is automatic.

As shown in fig. 5 to 7, the fixed contacts include a feeder line fixed contact 12, a ground fixed contact 13, and an intermediate fixed contact 16, and along the moving trajectory of the movable contact 11, the intermediate fixed contact 16 is located between the feeder line fixed contact 12 and the ground fixed contact 13, where the feeder line fixed contact 12 is conductive to the feeder line, the ground fixed contact 13 is conductive to the ground line, and the intermediate fixed contact 16 is not conductive to the line. Generally, a motor of an isolation grounding disconnecting link needs to move from an isolation closing position to an intermediate disconnecting position or from a grounding position to the intermediate disconnecting position within a range of 45 degrees, which puts forward a requirement on the movement speed of the motor, the movement speed of the motor cannot be too high, otherwise, the movement of the disconnecting position too high can cause large impact, and the motor cannot accurately stop at the disconnecting position. The action effect of the middle static contact 16 and the middle limiting component 29 is similar, and both the moving contact 11 can be stabilized at the opening position, so that the reliability of the position of the moving contact 11 is ensured. Of course, one of the above two structures may be selectively provided according to needs.

As shown in fig. 16 to 21, the mechanism assembly 20 includes a first manual shaft 220, a second manual shaft 230, a crank 240, and a second stopper 250, in addition to the sub-mounting plate 21 and the connecting shaft 23. The first manual shaft 220 and the second manual shaft 230 are both in driving connection with the connecting shaft 23; the crank 240 can be inserted into the first manual shaft 220 or the second manual shaft 230, and is matched with the first manual shaft 220 or the second manual shaft 230, the movable contact 11 is driven by the first manual shaft 220 or the second manual shaft 230 to switch positions, and the manual shaft matched with the crank 240 is adjusted according to actual requirements. The second limiting member 250 is connected to the connecting shaft 23 and rotates synchronously with the connecting shaft, the second limiting member 250 is located in front of the first manual shaft 220 and the second manual shaft 230, and the second limiting member 250 can block or avoid the front of the first manual shaft 220 or the second manual shaft 230 so as to block or avoid the crank 240 from butting against the first manual shaft 220 or the second manual shaft 230.

The concrete matching process among the components is as follows: when the isolation grounding disconnecting link is normally used, as shown in fig. 16, the movable contact 11 is located at the switching-on position, and at this time, the second limiting member 250 avoids the first manual shaft 220 and blocks the second manual shaft 230, so that the crank 240 can only be plugged into the first manual shaft 220 and is in driving connection with the first manual shaft 220, but cannot be matched with the second manual shaft 230, and thus, the crank 240 drives the movable contact 11 to be switched from the switching-on position to the switching-off position through the first manual shaft 220, the connecting shaft 23, the main shaft 15, the crank 18, the connecting rod 19 and other components, and in the rotating process, the second limiting member 250 gradually approaches the crank 240. Until the movable contact 11 moves to the opening position, as shown in fig. 17, the second limiting member 250 abuts against the crank 240, at this time, the second limiting member 250 cannot rotate continuously, and the connecting shaft 23, the first manual shaft 220, and the crank 240 cannot rotate, so as to achieve an effect of preventing the crank 240 from driving the movable contact 11 to rotate continuously, and at the same time, the second limiting member 250 avoids the second manual shaft 230, and the crank 240 can abut against the second manual shaft 230, at this time, an operator manually pulls out the crank 240 from the first manual shaft 220 and switches to insert the crank onto the second manual shaft 230, as shown in fig. 18, so that the second limiting member 250 no longer stops the crank 240, and the movable contact connecting shaft 23 and other components can rotate continuously, and the operator can drive the movable contact 11 to rotate continuously by rotating the crank 240 through the second manual shaft 230, and switch to the grounding position from the opening position. The arrangement mode enables the crank 240 and the second limiting part 250 to form a mutual self-locking limiting relation, so that the crank 240 can independently control two processes from a switching-on position to a switching-off position and from the switching-off position to a grounding position, and the design of preventing misoperation in manual operation is simpler and more convenient.

In the present embodiment, the second stopper 250 has a non-circular disk shape, and a first avoidance concave portion 2501 and a second avoidance concave portion 2502 are respectively opened at two opposite sides thereof, as shown in fig. 15, wherein the first avoidance concave portion 2501 is for avoiding the first manual shaft 220, and the second avoidance concave portion 2502 is for avoiding the second manual shaft 230. Specifically, when the movable contact 11 is located at the on position, although the first avoidance concave portion 2501 is displaced from the first manual shaft 220 and the second avoidance concave portion 2502 is displaced from the second manual shaft 230, the second stopper 250 is displaced from the front of the first manual shaft 220 and the second stopper 250 blocks the second manual shaft 230, so that the crank 240 can be drivingly connected to the first manual shaft 220 only and cannot be abutted against the second manual shaft 230, and the crank 240 can drive the movable contact 11 to rotate only by the first manual shaft 220. When the movable contact 11 moves to the opening position, since the crank 240 is inevitably engaged with the first manual shaft 220, the side wall of the first avoiding recess 2501 is inevitably abutted to the crank 240, so as to achieve the effect of preventing the crank 240 and the movable contact 11 from continuing to rotate, meanwhile, the second limiting member 250 rotates until the second avoiding recess 2502 is aligned with the second manual shaft 230, at this time, the crank 240 can be switched from the first manual shaft 220 to the second manual shaft 230, and then the movable contact 11 is driven by the second manual shaft 230 to continue to rotate.

Preferably, the distance between the first avoidance concave 2501 and the second avoidance concave 2502 is equal to the distance between the first manual shaft 220 and the second manual shaft 230, so as to ensure that the second avoidance concave 2502 can be aligned with the second manual shaft 230 when the first avoidance concave 2501 stops the crank 240.

As shown in fig. 19, in the present embodiment, the second limiting member 250 further has a stopping portion 2503, and when the crank 240 drives the movable contact 11 to move to the grounding position, the stopping portion 2503 abuts against the crank 240, so that the connecting shaft 23 cannot rotate continuously, and the effect of preventing the crank 240 from driving the movable contact 11 to rotate continuously is achieved. The second limiting member 250 and the first limiting member 28 of the present embodiment can limit the moving contact 11 when rotating to the switching-on position and the grounding position, and of course, the limiting function of the second limiting member 250 and the first limiting member 28 can also be selectively set according to the requirement. For example, the second limiting member 250 does not have the stopping portion 2503, and only the first limiting member 28 limits the movable contact 11 when it rotates to the closing position and the grounding position.

When the isolation grounding disconnecting link is installed in the cabinet body, the misoperation can be prevented only by locking the hole through which the crank 240 penetrates. Specifically, can set up two electromagnetic locks of first electromagnetic lock and second electromagnetic lock on the cabinet door of the cabinet body, the locking hole of first electromagnetic lock and second electromagnetic lock aligns with first manual axis 220 and second manual axis 230 respectively for it prevents mistake management and control to lock to crank 240. Before the manual operation, the first electromagnetic lock and the second electromagnetic lock are locked, and the crank 240 cannot pass through the electromagnetic locks to be connected with the manual shaft. When the condition that the isolation grounding disconnecting link is switched from the switching-on position to the switching-off position is met, the locking hole of the first electromagnetic lock is unlocked, the crank 240 can penetrate through the locking hole of the first electromagnetic lock and penetrate through the second limiting part 250 to be connected with the first manual shaft 220, the moving contact 11 is shaken, the moving contact 11 is made to move to the switching-off position, and at the moment, under the action of the second limiting part 250, the moving contact 11 stops moving. The operator then pulls the crank 240 away from the first manual shaft 220 and the first electromagnetic lock is automatically locked. When the condition that the isolation grounding disconnecting link moves from the disconnecting position to the grounding position is met, the locking hole of the second electromagnetic lock is unlocked, at this time, the crank 240 can penetrate through the locking hole of the second electromagnetic lock, penetrate through the second limiting piece 250, be connected with the second manual shaft 230, and shake the moving contact 11, so that the moving contact 11 moves to the grounding position, and at this time, under the action of the second limiting piece 250 and the first limiting piece 28, the moving contact 11 stops moving. Therefore, the operation of the whole isolation grounding disconnecting link is prevented from being mistaken, and the use is safer.

As shown in fig. 21, the mechanism assembly 20 of the present embodiment is provided with an installation box, the connection shaft 23, the first manual shaft 220 and the second manual shaft 230 are all inserted into the installation box, a gear is further disposed in the installation box, the gear sleeves are disposed on the connection shaft 23, the first manual shaft 220 and the second manual shaft 230 are respectively located at two opposite sides of the connection shaft 23, and the three are in driving engagement with each other through gear engagement, so that the effect that the connection shaft 23 can be driven to rotate by the first manual shaft 220 and the second manual shaft 230 is achieved.

As shown in fig. 3, in the mechanism assembly 20 of the present embodiment, since the drive control switch 24, the auxiliary node switch 25, the drive control cam 26 and the auxiliary node cam 27 are provided, the whole mechanism assembly 20 is also provided in two stages, i.e., a front stage and a rear stage, and the mechanism assembly 20 further includes an auxiliary mounting plate 280, the auxiliary mounting plate 280 is located in front of the auxiliary mounting plate 21 and spaced from the auxiliary mounting plate 21, the connecting shaft 23 is inserted into the auxiliary mounting plate 21 and the auxiliary mounting plate 280, the auxiliary node switch 25 and the auxiliary node cam 27 are both provided in the space between the auxiliary mounting plate 21 and the main mounting plate 14, and the driving member 22, the drive control switch 24, the drive control cam 26, the mounting box, the second stopper 250, and other components are all provided in front of the auxiliary mounting plate 280. Of course, the specific arrangement of the mechanism assembly 20 may also be adjusted as desired.

As shown in fig. 20, the mechanism assembly 20 of the present embodiment further includes a speed reducing mechanism 260 and a transmission mechanism 270, the speed reducing mechanism 260 and the transmission mechanism 270 are both disposed in front of the auxiliary mounting plate 280, and the speed reducing mechanism 260 is drivingly connected to the driving member 22; the transmission mechanism 270 is in driving connection with the speed reducing mechanism 260 and the connecting shaft 23, and the driving member 22 drives the connecting shaft 23 to rotate through the speed reducing mechanism 260 and the transmission mechanism 270. The electric control and the manual operation are not interfered with each other. The speed reducing mechanism 260 of the present embodiment is a planetary speed reducing mechanism, and the transmission mechanism 270 is a worm gear mechanism, but may be replaced by other mechanisms as needed.

It should be noted that, a plurality in the above embodiments means at least two.

From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:

1. the problem of low safety of a three-station isolation grounding disconnecting link in the prior art is solved;

2. the contact assembly and the mechanism assembly are in a modularized separation type design, so that the two parts form two relatively independent assemblies, the disassembly and the assembly can be quickly realized during the assembly, and the replacement of a fault mechanism can be quickly realized on site;

3. maintenance personnel only need to disassemble the mechanism assembly without disassembling the contact assembly and related cables once, so that the safety of personnel operation is improved;

4. the quick replacement of a new mechanism component is realized, and the maintenance and the overhaul of the knife gate product are quickly realized;

5. the mechanism components can be replaced in a live state on site, and the power-off treatment of the knife gate is not needed, so that the normal use is not influenced;

6. when maintenance personnel perform maintenance or wiring collection of the auxiliary node, only the secondary chamber needs to be opened, and a contact assembly facing a high-voltage area is not needed, so that the design of the isolation grounding disconnecting link is safer and more reliable;

7. the mechanism component avoids the right front side of the contact component, so that the mechanism component does not shield the contact component while the contact component is separated from the mechanism component, and an operator can easily observe the switching-on and switching-off conditions of the contact component;

8. the action of triggering the auxiliary node switch by the auxiliary node cam is certain to be prior to triggering the drive control switch by the drive control cam, so that the triggering reliability of the auxiliary node switch is ensured;

9. the middle limiting component realizes that the moving contact is accurately and reliably kept at the opening position;

10. the middle static contact is designed as an auxiliary structure for motor deceleration, so that the moving contact is braked, and the moving contact is stably and accurately stopped at a brake separating position;

11. the crank and the second limiting piece form a mutual self-locking limiting relation, so that the crank can independently control two processes from a switching-on position to a switching-off position and from the switching-off position to a grounding position, and the design of preventing misoperation in manual operation is simpler and more convenient;

12. in the aspect of preventing the mistake design, only need to carry out the shutting to the hole that the crank wore to establish, can realize preventing the operation of mistake for whole prevent mistake design is simpler.

It is to be understood that the above-described embodiments are only a few, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.