CN211045329U

CN211045329U - Interlocking device of grounding switch and cabinet door and switch cabinet

Info

Publication number: CN211045329U
Application number: CN201922302106.8U
Authority: CN
Inventors: 黄斯贝; 李剑胜; 余其贵; 袁宏志
Original assignee: Xiamen Huadian Switchgear Co Ltd
Current assignee: Xiamen Huadian Switchgear Co Ltd
Priority date: 2019-12-19
Filing date: 2019-12-19
Publication date: 2020-07-17
Anticipated expiration: 2029-12-19

Abstract

The disclosure discloses an interlocking device of a grounding switch and a cabinet door and a switch cabinet. The switch cabinet comprises the interlocking device. The interlocking device of earthing switch and cabinet door of this disclosure includes interlocking mounting bracket, movable assembly, cam mechanism, cabinet door interlocking piece and release mechanism. The interlocking mounting is mounted on the door frame. The movable assembly includes a travel bar, a top plate, and a boss disposed on the top plate. The cam mechanism is sleeved on a transmission shaft of the grounding switch and can press down the top plate to force the movable assembly to move downwards, and when the cam mechanism rotates along with the transmission shaft to the switching-on position of the grounding switch, the boss blocks the cam mechanism from rotating towards the switching-off direction; the cabinet door interlocking piece is used for being installed on a cabinet door of the switch cabinet, and a slot for the moving rod to insert is formed in the cabinet door interlocking piece. The unlocking mechanism comprises an unlocking connecting plate and an unlocking rod, the unlocking rod is extruded by the cabinet door to retract when the cabinet door is closed, the moving rod is driven to move downwards, and the blocking effect of the cam mechanism by the boss is relieved.

Description

Interlocking device of grounding switch and cabinet door and switch cabinet

Technical Field

The present disclosure relates to an electrical device for a medium-high voltage switch, and more particularly, to an interlock device for an earthing switch and a cabinet door of an electrical device for a medium-high voltage switch, and a switch cabinet having the same.

Background

The switch cabinet is a common electrical device in a power grid, and is opened, closed, controlled and protected in the process of generating, transmitting, distributing and converting electric energy of a power system. A switchgear generally includes a circuit breaker, an earthing switch, a load switch, an operating mechanism, a contactor, various protection devices, and the like, and has a "five-prevention" function of preventing disconnection and connection of an isolating switch under load, preventing disconnection and connection of a circuit breaker by mistake, preventing earthing knife-switch from being connected under load, preventing the isolating switch from being connected under ground, and preventing the isolating switch from being connected under ground and entering an electrified interval by mistake. Wherein, prevent that the electrified spaced function of mistake income from generally realizing through the interlock of earthing switch with the cabinet door, when the cabinet door of cubical switchboard was opened promptly, earthing switch can't the separating brake, and during earthing switch separating brake, the cabinet door can not be opened.

However, the traditional interlocking device of the grounding switch and the cabinet door has the problems of large quantity of parts, high cost and complex unlocking and interlocking matching.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems that the quantity of parts of an interlocking device of an earthing switch and a cabinet door is large, the cost is high, and unlocking and interlocking matching are complex in the prior art, the disclosure provides the interlocking device of the earthing switch and the cabinet door with a simplified structure and the switch cabinet.

The utility model provides an interlock of earthing switch and cabinet door, include:

the interlocking mounting rack is used for being mounted on a door frame of the switch cabinet;

the movable assembly comprises a moving rod, a top plate positioned at the top end of the moving rod and a boss arranged on the top plate, and the moving rod penetrates through the interlocking mounting frame from top to bottom and can move up and down relative to the interlocking mounting frame;

the cam mechanism is sleeved on a transmission shaft of the grounding switch, can press the top plate downwards to force the movable assembly to move downwards, and blocks the boss to rotate towards the opening direction when the cam mechanism rotates along with the transmission shaft to the closing position of the grounding switch;

the cabinet door interlocking piece is used for being installed on a cabinet door of the switch cabinet and is positioned below the interlocking installation frame, and a slot for inserting the moving rod is formed in the cabinet door interlocking piece;

unlocking mechanism, including unblock connecting plate and unblock pole, the unblock pole runs through from inside to outside the interlocking mounting bracket just the outer end of unblock pole can surpass the door frame, the one end of unblock connecting plate is connected the carriage release lever, the other end of unblock connecting plate is connected the inner of unblock pole, the unblock pole is in receive the extrusion of cabinet door and the internal contraction when the cabinet door is closed, drive the carriage release lever moves down, and it is right to relieve the boss cam mechanism block the effect.

In one embodiment, the cam mechanism comprises a first steering brake block and a second steering brake block which are cam-shaped, and the first steering brake block and the second steering brake block are used for being sleeved on the transmission shaft;

the first steering brake block is provided with a locking bulge part, and when the locking bulge part rotates to the boss in a first direction, the locking bulge part and the boss are matched to prevent the first steering brake block from rotating in a second direction, wherein the first direction and the second direction are opposite directions, and the second direction is a closing direction;

a distal hub radius of the second steer stop being greater than a distal hub radius of the first steer stop, the second steer stop for applying downward pressure to the top plate;

the second steering brake block is positioned on one side of the first steering brake block facing the cabinet door, and the second steering brake block is positioned on the outer side of the boss to avoid the boss.

In one embodiment, the first steering brake pad further includes a limit projection, and a length of the locking projection protruding from a center of the first steering brake pad is smaller than a length of the limit projection protruding from the center of the first steering brake pad.

In an embodiment, the first and second steer brake pads are two separately formed pieces, or the first and second steer brake pads are integrally formed.

In one embodiment, the second steering brake pad comprises a distal hub portion and a proximal hub portion, the distal hub portion having a distal hub radius greater than a proximal hub radius of the proximal hub portion, the distal hub portion having an arc length of approximately one-half of a total arc length of the second steering brake pad.

In an embodiment, the moving rod is further provided with an elastic part and a pin shaft, the pin shaft is located between the interlocking mounting frame and the top plate, the elastic part is located between the interlocking mounting frame and the pin shaft, and the elastic part is compressed to store energy in the moving rod moving down process.

In one embodiment, the pin shaft penetrates through the moving rod, so that two ends of the pin shaft protrude out of the outer surface of the moving rod.

In one embodiment, the interlocking mounting bracket has a U-shaped channel plate including a web and two side flanges, and the travel bar extends through both of the flanges.

In an embodiment, the interlocking mounting frame further comprises a fixing bracket, the fixing bracket comprises an extension plate and a supporting plate, the extension plate is connected to one side of a web plate of the U-shaped groove plate and protrudes towards the opposite direction of the wing plate, the supporting plate is perpendicular to the extension plate and extends towards the web plate, a through hole for the unlocking rod to penetrate through is formed in the supporting plate, a fixing hole is formed in the extension plate, and a fastener passes through the fixing hole to fix the interlocking mounting frame on a side plate of a door frame of the switch cabinet.

In one embodiment, the cabinet door interlocking piece is L type, and the cabinet door interlocking piece comprises a vertical plate and a transverse plate, the transverse plate is provided with the slot, and the vertical plate can be attached to the cabinet door of the switch cabinet and fixed on the cabinet door through a fastener.

In one embodiment, the top plate protrudes from the top of the moving rod in the direction of the cam mechanism, and the boss is located at the edge of the top plate on the side away from the moving rod.

In one embodiment, one side of the unlocking connecting plate is formed with an inward concave arc-shaped surface, so that the unlocking connecting plate can be contracted relative to the moving rod.

In one embodiment, the curvature of the arc surface is greater than or equal to 120 degrees and less than 180 degrees.

The present disclosure additionally provides a switchgear, comprising:

the refrigerator comprises a cabinet body, wherein a door frame and a cabinet door are arranged on the cabinet body;

the circuit breaker is arranged in the cabinet body;

the grounding switch is arranged in the cabinet body and is provided with a transmission shaft; and

in the interlocking device of the grounding switch and the cabinet door, the interlocking mounting frame of the interlocking device is mounted on the door frame of the switch cabinet, the cabinet door interlocking piece is mounted on the cabinet door and close to the door frame, the cam mechanism is sleeved on the transmission shaft, and the cam mechanism rotates along with the rotation of the transmission shaft.

The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:

the utility model discloses an interlock of earthing switch and cabinet door includes the interlocking mounting bracket, but movable assembly, cam mechanism, cabinet door interlocking piece and release mechanism, the interlocking mounting bracket is installed on the door frame, but movable assembly is under cam mechanism's effect, can reciprocate for the interlocking mounting bracket, and when shifting down, but movable assembly's carriage release lever can insert the cabinet door interlocking piece of fixing on the cabinet door, make the cabinet door can not open, but movable assembly shifts up, the carriage release lever breaks away from cabinet door interlocking piece, the cabinet door can be opened, when the cabinet door is opened, the boss at movable assembly top and cam mechanism cooperation locking earthing switch's transmission shaft, make the transmission shaft inequality to the branch brake direction rotate, carry out the branch brake operation when effectively preventing the cabinet door to open. Only when waiting that the cabinet door is closed, just accessible release mechanism unlocks the cooperation between boss and the cam mechanism, and when the cabinet door was closed promptly, release mechanism's unblock pole received the extrusion of cabinet door and removed in the cabinet, and release lever drives the unblock connecting plate shrink, and the unblock connecting plate drives movable assembly and moves down, and cam mechanism breaks away from blockking of boss, removes the locking of transmission axial separating brake direction, can carry out the separating brake operation. So, the boss of the portable subassembly that sets up through this disclosure and the cooperation structure of cam structure realize that the cabinet door can't carry out the separating brake operation when opening to just can carry out the separating brake operation when the cabinet door is closed through release mechanism, and through the cooperation of carriage release and cabinet door interlocking piece, realize that earthing switch is in when separating the floodgate position, can't open the cabinet door. Therefore, the personnel are prevented from being mistakenly operated and mistakenly entering the electrified interval. The interlocking device disclosed by the invention is ingenious in design, simple in structure, low in cost and high in safety and reliability.

The switch cabinet disclosed by the invention comprises a cabinet body, a circuit breaker arranged in the cabinet body, a grounding switch and an interlocking device of the grounding switch and a cabinet door, wherein the switch cabinet not only has the functions of preventing personnel from misoperation and mistakenly entering an electrified interval, but also has the advantages of simple structure, low cost and high safety and reliability.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

Fig. 1 is a side schematic view of a switchgear of the present disclosure.

Fig. 2 is a partially enlarged view of region a in fig. 1.

Fig. 3 is a schematic perspective view of the interlock device and the transmission shaft when the earthing switch is in the opening position.

Fig. 4 is a side sectional view of fig. 3.

Fig. 5 is a perspective view of a part of the interlock device when the grounding switch is in the open position.

FIG. 6 is a schematic view of the engagement between the first steering brake pad and the moveable assembly with the grounding switch in the tripped position.

FIG. 7 is a schematic view of the engagement between the second steering brake shoe and the moveable assembly with the grounding switch in the tripped position.

Fig. 8 is a perspective view of the interlock device and the drive shaft when the earthing switch is in the on position.

Fig. 9 is a side sectional view of fig. 8.

Fig. 10 is a perspective view of a portion of the interlock device when the ground switch is in the on position.

FIG. 11 is a schematic view of the engagement between the first steering brake shoe and the moveable assembly with the grounding switch in the ON position.

FIG. 12 is a schematic view of the engagement between the second steering brake shoe and the moveable assembly with the ground switch in the closed position.

Detailed Description

For further explanation of the principles and construction of the present disclosure, reference will now be made in detail to the preferred embodiments of the present disclosure, which are illustrated in the accompanying drawings.

As shown in fig. 1 and 2, fig. 1 is a schematic side view of the switchgear of the present disclosure, and fig. 2 is a partially enlarged view of a region a in fig. 1. The present disclosure provides a switchgear 100, the switchgear 100 comprising a cabinet body 101, an earthing switch 20 arranged in the cabinet body 101, a circuit breaker (not shown) and an interlock 10 of the earthing switch and the cabinet door.

The cable compartment of the cabinet body 101 is provided with a door frame 102 and a cabinet door 103 installed at the door frame 102. The inner side of the door frame 102 is provided with a side plate 1021 perpendicular to the cabinet door 103 and extending toward the inside of the cabinet.

The earthing switch 20 has a transmission shaft 21, and the transmission shaft 21 cooperates with the interlocking device 10 to interlock the earthing switch 20 and the cabinet door 103, that is: when the grounding switch 20 is in the opening position, the cabinet door 103 cannot be opened, and when the cabinet door 103 is opened, the grounding switch 20 cannot be operated in the opening position.

Fig. 3 is a schematic perspective view of the interlock device and the transmission shaft when the earthing switch is in the open position. The interlock device 10 includes an interlock mounting bracket 11, a movable assembly 12, a cabinet door interlock tab 13, a cam mechanism 14, and an unlock mechanism 15. An interlock mounting plate 11 is mounted on side plate 1021, and a movable assembly 12 extends through interlock mounting plate 11 and is movable up and down relative to interlock mounting plate 11. The cabinet door interlocking piece 13 is fixed on the cabinet door 103, the cam mechanism 14 is sleeved on the transmission shaft 21 of the grounding switch 20, when the transmission shaft 21 rotates to the opening position of the grounding switch 20, the cam mechanism 14 applies downward pressure to the movable assembly 12 to enable the lower end of the movable assembly 12 to be inserted into the cabinet door interlocking piece 13, and the cabinet door 103 cannot be opened. When the transmission shaft 21 rotates to the closing position of the grounding switch 20, the movable assembly 12 moves upward and the lower end thereof is pulled out from the cabinet door interlocking piece 13, the cabinet door 103 can be opened, and meanwhile, the boss on the top of the movable assembly 12 blocks the cam mechanism 14 from rotating in the opening direction to lock the transmission shaft 21, so that the transmission shaft 21 is prevented from opening when the cabinet door 103 is opened. When the cabinet door 103 is closed, the unlocking mechanism 15 is pushed by the cabinet door 103 to contract inwards, so that the movable assembly 12 is driven to move downwards, the boss unlocks the transmission shaft 21, the cam mechanism 14 is separated from the block of the boss, and the transmission shaft 21 can rotate towards the opening direction to perform opening.

Referring to fig. 4 and 5, fig. 4 is a side sectional view of fig. 3, and fig. 5 is a perspective view of a partial structure of the interlock device when the grounding switch is in the open position. The movable assembly 12 includes a moving rod 121, a top plate 122 at the top end of the moving rod 121, and a boss 123 provided on the top plate 122. The top plate 122 extends from the top of the travel bar 121 in the direction of the cam mechanism 14 by a length sufficient to allow the cam mechanism 14 to contact the top plate 122. The boss 123 is located at an edge of the top plate 122 on a side away from the moving rod 121.

Interlocking mount 11 has a U-shaped channel plate 111, and U-shaped channel plate 111 includes a web 1111 and two side wings 1112. The U-shaped slot plate 111 is vertically arranged, such that the web 1111 is parallel to the moving rod 121, and the two wing plates 1112 are perpendicular to the moving rod 121, such that the moving rod 121 penetrates through the two parallel wing plates 112 from top to bottom, thereby maintaining the smoothness and straightness of the moving rod 121 in the vertical direction.

In one embodiment, the interlocking mounting bracket 11 may also be an L template.

Further, the interlocking mounting bracket 11 may further include a fixing bracket 122, and the fixing bracket 122 includes an extension plate 1121 connected to one side of the web 1111 of the U-shaped channel plate 111 and protruding in the opposite direction to the wing plate 1112, and a support plate 1122 perpendicular to the extension plate 1122 and extending in the direction of the web 1112. The extension plate 1121 is provided with a fastening hole through which a fastener is inserted to fix the interlocking mounting bracket 11 to the side plate 1021 of the switchgear cabinet 100. The supporting plate 1122 is provided with a through hole for the unlocking rod of the unlocking mechanism 15 to pass through, so as to support the unlocking rod and keep the unlocking rod perpendicular to the cabinet door 103.

It is understood that in other embodiments, the interlocking mount 11 may be provided without the plate 1122.

The cabinet door interlocking piece 13 is L type, the cabinet door interlocking piece 13 comprises a vertical plate 131 and a transverse plate 132, the transverse plate 132 and the vertical plate 131 form a general L type, the transverse plate 131 extends towards the direction of the moving rod 121 and extends to a length beyond the moving rod 121, so that the lower end of the moving rod 121 can be inserted into the slot of the transverse plate 131, and the vertical plate 131 is attached to the cabinet door 103 of the switch cabinet 100 and fixed on the cabinet door 103 through a fastener.

Referring to fig. 6 and 7, fig. 6 is a schematic view showing the engagement between the first steering brake pad and the movable member when the earthing switch is in the brake separating position, fig. 7 is a schematic view showing the engagement between the second steering brake pad and the movable member when the earthing switch is in the brake separating position, the cam mechanism 14 includes a first steering brake pad 141 and a second steering brake pad 142, and the first steering brake pad 141 and the second steering brake pad 142 are both cam-shaped and are sleeved on the transmission shaft 21 to rotate with the rotation of the transmission shaft 21. The first steering stop block 141 has a stopper protrusion 1411 and a locking protrusion 1412. The limit projection 1411 is used to limit the rotation angle of the transmission shaft 21. When the transmission shaft 21 rotates to the opening position of the earthing switch 20, the limit projection 1411 of the first steering brake block 141 abuts against one side surface of the boss 123 close to the moving rod 121, and the transmission shaft 21 cannot rotate forwards due to the stop of the boss 123, so that the rotation angle of the transmission shaft 21 is limited within a preset range. The locking protrusion 1412 cooperates with the boss 123 to prevent the door 103 from being opened when the door is not closed. Specifically, as shown in fig. 11, the locking protrusion 1412 rotates to the boss 123 in a first direction (i.e., a closing direction), the movable assembly 12 moves upward integrally, the grounding switch is in a closing position, the cabinet door 103 can be opened, and the first steering brake block 141 cannot rotate in a second direction (i.e., an opening direction) when being blocked by the boss 123. Wherein, the first direction and the second direction are opposite directions.

In this embodiment, the direction in which the transmission shaft 21 rotates the first steering brake block 141 and the second steering brake block 142 in the first direction is the closing direction of the earthing switch, and the direction in which the transmission shaft rotates in the second direction is the opening direction of the earthing switch. The first direction and the second direction are opposite directions, for example, when the first direction is a clockwise direction, the second direction is a counterclockwise direction. It will be appreciated that where the first direction is counter-clockwise, the second direction is clockwise.

Since the movable assembly 12 is moved a distance as a whole when the earthing switch is in the on position, the length of the locking boss 1412 protruding from the center O of the first steering brake block 141 is shorter than the length of the limit boss 1411 protruding from the center O of the first steering brake block 141. That is, the protruding length of the stopper boss 1411 is greater than the distal hub radius R1 of the first steering brake pad 141. The distal hub radius R1 is the radius of the circle drawn from the center O of the cam (i.e., the first direction brake pad 141) to the radius of the highest point of the cam.

The second turn brake block 142 includes a distal hub portion 1421 and a proximal hub portion 1422. The distal hub radius R2 of the distal hub portion 1421 is greater than the proximal hub radius R3 of the proximal hub portion 1422. More specifically, the distal hub radius R2 of the distal hub portion 1421 is greater than twice the proximal hub radius R3 of the proximal hub portion 1422, so that the distal hub portion 1421 protrudes by a length that allows the entire pressed movable assembly 12 to be moved downward by a predetermined length sufficient for the lower end of the moving rod 121 to be inserted into the cabinet door interlocking piece 13. The arc length of the distal hub 1421 is approximately one-half of the total arc length of the second steering brake block 142, so that the second steering brake block 142 can always keep pressing down the movable assembly 12 during the closing rotation (i.e. the rotation of the transmission shaft from the opening position to the closing position), and the movable rod 121 is always inserted into the cabinet door interlocking piece 13 before the closing position, thereby preventing the cabinet door 103 from being opened during the closing rotation.

It should be noted that the near-hub radius R3 is a radius of a circle from the cam center Q to the lowest point of the cam (i.e., the second steering brake pad).

The first and second

steering brake pads

141 and 142 are two separately molded members. The second steering brake block 141 is located on a side of the first steering brake block 141 facing the cabinet door 103, and the second steering brake block 142 is located outside the boss 123 to avoid the boss 123.

The distal hub radius R2 of the second steering stop 142 is greater than the distal hub radius R1 of the first steering stop 141. In this way, the second steering brake block 142 applies downward pressure to the movable assembly 12, and the first steering brake block 141 mainly cooperates with the boss 123 to prevent the door 103 from opening.

In an embodiment, the first and second

steering brake blocks

141 and 142 may also be integrally formed.

Further, as shown in fig. 3, the transmission shaft 21 is further provided with a baffle 18 fixed in the cabinet, the baffle 18 is shaped like L, the baffle 18 is located outside the top plate 122 and surrounds the cam mechanism 14 to limit the cam mechanism 14 in the space surrounded by the baffle 18, on the other hand, the baffle 18 is further provided with an opening for the transmission shaft 21 to pass through for ensuring the rotating smoothness and straightness of the transmission shaft 21.

Referring back to fig. 4 and 5, the unlocking mechanism 15 includes an unlocking link plate 152 and an unlocking lever 151. The unlocking rod 151 penetrates the interlocking mounting frame 11 from the inside to the outside, and the outer end of the unlocking rod 151 can be protruded out of the door frame. More specifically, the release lever 151 is disposed through the web 1111 and the bracket 1122 of the interlock mount 11. The release lever 151 is movable inside and outside with respect to the interlocking mount 11. The unlocking link plate 152 has one end connected to the moving bar 121 and the other end connected to the inner end of the unlocking bar 151. An inwards concave arc-shaped surface 1521 is formed on one side of the unlocking connecting plate 152, and the other side of the unlocking connecting plate 152 protrudes outwards correspondingly, so that the unlocking connecting plate has a certain curvature, and when the unlocking rod 151 moves inwards, the unlocking connecting plate 152 can contract inwards. Thus, when the door 103 is closed and the lock release lever 151 is moved inward by the compression of the door 103, the lock release link 152 is retracted inward, thereby moving the moving rod 121 downward and releasing the cam mechanism 14 from the boss 122.

In one embodiment, the arc of curvature of the arc surface 1521 is greater than or equal to 120 degrees and less than 180 degrees, so that the unlocking connecting plate 152 can retract around the connecting point of the unlocking connecting plate 152 and the moving rod 121.

Further, the moving rod 121 is further provided with an elastic member 16 and a pin 17. The pin 17 is located between the interlocking mount 11 and the top plate 122. The pin 17 penetrates the moving rod 121, so that both ends of the pin 17 protrude from the outer surface of the moving rod 121. The resilient member 17 is trapped between the interlocking mount 11 and the pin. During the downward movement of the moving rod 121, the elastic member 17 is compressed to store energy. When the downward external force applied to the moving rod 121 is smaller than the elastic force of the elastic member 17, the elastic member 17 releases energy to force the moving rod 121 to move upward, so that the moving rod 121 is pulled out of the cabinet door interlocking piece 13, and the cabinet door 103 can be opened.

As shown in fig. 3-7, the states and positional relationships of the various components of the interlock device are shown when the earthing switch is in the on position. Specifically, when the earthing switch is rotated to the open position, the limit projection 1411 of the first steering stopper 141 of the cam mechanism 14 cooperates with the boss 123 to limit the transmission shaft 21 from further rotating, and the distal hub 1421 of the second steering stopper 142 contacts the top plate 123 and applies downward pressure to the top plate 123. The movable assembly 12 moves down integrally, the lower end of the movable rod 121 is inserted into the cabinet door interlocking piece 13, and the cabinet door 103 cannot be opened. The lock release lever 151 of the lock release mechanism 15 moves inward, retracting relative to the travel lever 121. Thus, when the grounding switch 20 is in the opening position, the cabinet door 103 cannot be opened.

Fig. 8 to 12 are perspective views of the interlock device and the transmission shaft when the earthing switch is in the on position, fig. 9 is a side sectional view of fig. 8, fig. 10 is a perspective view of a partial structure of the interlock device when the earthing switch is in the on position, fig. 11 is a view of the engagement between the first steering brake pad and the movable member when the earthing switch is in the on position, and fig. 12 is a view of the engagement between the second steering brake pad and the movable member when the earthing switch is in the on position. The states of the components and the positional relationship between each other of the interlock device of the present disclosure when the earthing switch is in the on position are described below with reference to fig. 8 to 12. When the grounding switch 20 is rotated to the on position, the locking protrusion 1412 of the first steering stop 141 of the cam mechanism 14 cooperates with the boss 123 to prevent the transmission shaft 21 from being rotationally locked to the transmission shaft 21 in the opening direction (i.e., counterclockwise direction), and the distal hub part 1421 of the second steering stop 142 is away from the top plate 123 and no longer applies downward pressure to the top plate 123. The movable assembly 12 moves upward as a whole, the lower end of the moving rod 121 is disengaged from the cabinet door interlocking piece 13, and the cabinet door 103 can be opened. After the cabinet door 103 is opened, the unlocking rod 151 of the unlocking mechanism 15 moves outward, so that the outer end of the unlocking rod 151 protrudes out of the cabinet door 103. When the cabinet door 103 is not closed, the locking protrusion 1412 of the first turning stopper 141 keeps the transmission shaft 21 in a locked state and cannot turn counterclockwise. When the cabinet door 103 is closed, the unlocking mechanism 15 pulls the movable assembly 12 to move down integrally, the locking boss 1412 is separated from the block of the boss 123, the transmission shaft 21 is unlocked, and the opening can be performed by counterclockwise rotation.

The above description is only for the purpose of illustrating the preferred embodiments of the present disclosure and is not to be construed as limiting the scope of the present disclosure, but rather is intended to cover all equivalent structural changes made by applying the teachings of the present disclosure to the accompanying drawings.

Claims

1. An interlock of earthing switch and cabinet door, characterized by includes:

the cam mechanism is sleeved on a transmission shaft of the grounding switch, can press the top plate downwards to force the movable assembly to move downwards, and blocks the cam mechanism from rotating towards the opening direction when the cam mechanism rotates along with the transmission shaft to the closing position of the grounding switch;

2. The interlock device of the earthing switch and the cabinet door according to claim 1, wherein the cam mechanism comprises a first and a second cam-shaped steering brake block for engaging with the transmission shaft;

3. The interlock of claim 2, wherein the first steering brake block further comprises a limit protrusion, and a length of the lock protrusion protruding from a center of the first steering brake block is less than a length of the limit protrusion protruding from the center of the first steering brake block.

4. The interlock device of claim 2, wherein the first and second turn stop blocks are formed as two separate pieces or are integrally formed.

5. The door interlock of claim 2, wherein said second diverter stop includes a distal hub portion and a proximal hub portion, said distal hub portion having a distal hub radius greater than a proximal hub radius of said proximal hub portion, said distal hub portion having an arc length that is one-half of a total arc length of said second diverter stop.

6. The interlock of claim 1, wherein the moving rod further comprises an elastic member and a pin, the pin is located between the interlock mounting bracket and the top plate, the elastic member is located between the interlock mounting bracket and the pin, and the elastic member is compressed to store energy during downward movement of the moving rod.

7. The interlock device for the grounding switch and the cabinet door as claimed in claim 6, wherein the pin shaft penetrates through the moving rod, so that two ends of the pin shaft protrude out of the outer surface of the moving rod.

8. The interlock device for grounding switch and cabinet door according to claim 1, wherein said interlock mounting bracket has a U-shaped channel plate, said U-shaped channel plate includes a web and two side flanges, said moving rod penetrates both said flanges.

9. The interlocking device of the grounding switch and the cabinet door as claimed in claim 8, wherein the interlocking mounting frame further comprises a fixing bracket, the fixing bracket comprises an extending plate connected to one side of the web of the U-shaped slot plate and protruding towards the opposite direction of the wing plate, and a supporting plate perpendicular to the extending plate and extending towards the web, a through hole for the unlocking rod to pass through is formed in the supporting plate, a fixing hole is formed in the extending plate, and a fastener fixes the interlocking mounting frame on the side plate of the door frame of the switch cabinet through the fixing hole.

10. The interlock device of claim 8, wherein said cabinet door interlock piece is shaped as L, and comprises a vertical plate and a horizontal plate, said horizontal plate is provided with said slot, and said vertical plate can be engaged with the cabinet door of said switch cabinet and fixed on the cabinet door by a fastener.

11. The interlock device for grounding switch and cabinet door according to claim 1, wherein the top plate protrudes from the top of the moving rod toward the cam mechanism, and the boss is located at the edge of the top plate on the side away from the moving rod.

12. The interlock device of claim 1, wherein one side of said unlocking connecting plate is formed with an arc surface that is concave so that said unlocking connecting plate can be retracted relative to said moving bar.

13. The interlock device for grounding switch and cabinet door according to claim 12, wherein the arc degree of the arc surface is greater than or equal to 120 degrees and less than 180 degrees.

14. A switchgear, comprising:

the circuit breaker is arranged in the cabinet body;

the interlock device of any one of claims 1 to 13, wherein the interlock mounting bracket of the interlock device is mounted on a door frame of the switchgear cabinet, the door interlock piece is mounted on the door close to the door frame, the cam mechanism is sleeved on the transmission shaft and rotates along with the rotation of the transmission shaft.