CN110957171A - Safety interlocking device of front lower door of switch cabinet - Google Patents

Abstract

The invention discloses a safety interlocking device for a front lower door of a switch cabinet, which comprises: the operating shaft is arranged in the switch cabinet, an operating hole is formed in the cabinet body, and a valve which can shield the operating hole and is reset by a first spring is further arranged on the cabinet body; the cabinet body at the front lower door is provided with a mounting frame, a lifting rod and a valve baffle reset by a second spring penetrate through the mounting frame, the valve baffle can extend forwards and reset to a position where the valve can stop moving downwards, a mounting seat is fixed on the lifting rod, a locking plate with a locking groove and abutting against a step penetrates through the mounting seat, an elastic extension mechanism capable of enabling the locking plate to elastically extend forwards out of a avoiding hole in the cabinet body is arranged between the locking plate and the mounting seat, and an elastic pushing mechanism capable of enabling the lifting rod to elastically extend upwards is arranged between the lifting rod and the mounting frame; the operating shaft is provided with a cam capable of pressing the lifting rod, and the inner side of the front lower door is provided with a lock pin. The safety interlocking device can interlock the switch of the front lower door of the switch cabinet and the on-off of the grounding switch, so that the safety of the switch cabinet is greatly improved.

Description

Safety interlocking device of front lower door of switch cabinet

Technical Field

The invention relates to a switch cabinet, in particular to a safety interlocking device of a front lower door of the switch cabinet.

Background

A switch cabinet is a common electrical device mainly including a circuit breaker, and is divided into a low-voltage switch cabinet and a high-voltage switch cabinet. At present, the requirements on the technical performance, operation, use, overhaul, maintenance and the like of the removable switch cabinet in an electric power system are higher and higher, and particularly the requirements on safety are higher and higher. When the switch cabinet is maintained and overhauled, in order to prevent the switch cabinet from being electrified and endangering personal safety, the operating shaft in the switch cabinet needs to be rotated firstly to switch on and earth the earthing switch in the switch cabinet, then the front lower door or the rear door of the switch cabinet can be opened for maintenance and overhaul, and in the process of opening the door for maintenance and overhaul, the rotating operating shaft is not allowed to disconnect the earthing switch from the brake and the earthing. But the back door and preceding lower door and earthing switch of current cubical switchboard are not interlocked, promptly: the on-off of the grounding switch, the opening and closing of the rear door and the opening and closing of the front lower door are mutually independent, so that the grounding switch is easy to be in non-closed grounding, a maintainer opens the front lower door or the rear door of the switch cabinet to maintain, or the grounding switch of the switch cabinet is disconnected and grounded by mistaken opening in the process of opening, maintenance and repair, and electric shock danger is easy to occur.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: a safety interlocking device for a front lower door of a switch cabinet, which can interlock the opening and closing of the switch of the front lower door of the switch cabinet and the grounding switch, is provided.

In order to solve the problems, the technical scheme adopted by the invention is as follows: a safety interlock for a front lower door of a switchgear comprising: install the operating axis in the cubical switchboard cabinet body, can drive earthing switch separating brake or combined floodgate in the cubical switchboard behind the positive, reversal operating axis, its characterized in that: an operation hole for rotating an operation shaft is formed in the front cabinet wall of the switch cabinet body, a valve capable of shielding the operation hole and reset by a first spring is further arranged on the cabinet body, when external force overcomes the elastic force of the first spring, the valve can move downwards to a position where the operation hole is not shielded, and the valve can reset to a position where the operation hole is shielded under the action of the first spring; the switch cabinet is characterized in that a mounting frame which is positioned below an operating shaft is arranged on a cabinet body at the front lower door of the switch cabinet, a lifting rod and a valve baffle which can move back and forth and is reset by a second spring are arranged on the mounting frame in a penetrating manner, the valve baffle can extend forwards under the action of the second spring and reset to a position for blocking the valve from moving downwards, a mounting seat is fixed on the lifting rod, a locking plate which can move back and forth is arranged on the mounting seat in a penetrating manner, a locking groove which is provided with an upward opening and is positioned at the front end of the locking plate and an abutting step which is positioned behind the locking groove are arranged on the locking plate, an elastic extending mechanism which can enable the locking plate to elastically extend forwards out of an avoiding hole in the front cabinet wall of the cabinet body is arranged between the locking plate and the mounting seat, and an elastic pushing mechanism which can enable the lifting rod to; the operating shaft is provided with a cam positioned above the lifting rod, the operating shaft is rotated to enable the cam to press the lifting rod when the grounding switch is switched on, so that the lifting rod drives the locking plate to move downwards, the operating shaft is rotated reversely to enable the cam not to press the lifting rod when the grounding switch is switched off, the lifting rod drives the locking plate to reset upwards, and the inner side of the front lower door is provided with a locking pin; when the front lower door is closed, the front lower door presses the locking plate to enable the locking plate to move backwards, and the lock pin is located right above the lock groove; when the lower door is closed and locked and the grounding switch is in a brake-off state due to the operation shaft, the valve baffle plate is pushed by the locking plate and then moves to a position where the valve is not blocked, the lifting rod drives the locking plate to reset upwards to a position where the locking groove blocks the locking pin, at the moment, the abutting step moves backwards to the rear of the avoiding hole and is higher than the avoiding hole along with the upward resetting of the locking plate, and therefore the locking plate can abut against the step and is abutted against the inner wall of the cabinet body and cannot be pulled out; when the front lower door needs to be opened, the valve is pressed downwards, then the operating shaft is rotated to enable the grounding switch to be switched from open to closed, the valve is loosened to enable the valve to reset after the closed, the operating shaft drives the lower cam to press the lifting rod to drive the lock plate to move downwards to the position where the lock groove is separated from the lock pin, meanwhile, the lower cam is pressed against the step to move downwards to the position where the avoiding hole can be extended, then the front lower door can be opened, the lock plate can extend forwards to reset under the action of the elastic extension mechanism along with the opening of the front lower door, and meanwhile, the valve baffle also extends forwards to reset to the position where the valve can be stopped to move downwards under the action of the second spring.

Further, the safety interlock device of preceding lower door of cubical switchboard wherein: articulated on the preceding cabinet wall outside of handle hole one side have a locking strip, the locking strip can swing to sheltering from the handle hole, be provided with a lockplate on the preceding cabinet wall outside of handle hole opposite side, be provided with a first lockhole of going up on the lockplate, lockhole on being provided with a second on the locking strip outer end, the locking strip swings to when sheltering from the position of handle hole, lockhole can align each other on first lockhole and the second, make the locking strip can be through first, the second is locked the lockhole by the tool to lock, thereby make the locking strip can be locked in the position of sheltering from the handle hole.

Further, the safety interlock device of preceding lower door of cubical switchboard wherein: the pushing structure between the locking plate and the valve baffle is as follows: the valve baffle is provided with a vertical plate, the locking plate is provided with a transverse plate positioned in front of the vertical plate, and when the locking plate moves backwards, the transverse plate can be abutted against the vertical plate, so that the locking plate can overcome the elastic force of the second spring and push the valve baffle backwards.

Further, the safety interlock device of preceding lower door of cubical switchboard wherein: the structure of the elastic pushing mechanism comprises: set up a spacer pin and a lower spacer pin on the lifter, go up the spacer pin and be located the top of mounting bracket, lower spacer pin is located the below of mounting bracket, and the cover is equipped with a compressed third spring on the lifter between last spacer pin and mounting bracket, and the both ends of third spring are supported with last spacer pin and mounting bracket respectively and are leaned on for the third spring can promote the lifter and rise, and the spacer pin is leaned on with the mounting bracket counterbalance under until.

Further, the safety interlock device of preceding lower door of cubical switchboard wherein: the structure of the elastic extension mechanism comprises: set up rectangular shape hole and spacing post of a fore-and-aft trend on the jam plate, spacing post is located the rear of mount pad, it is rectangular to be provided with the installation of moving towards and wearing to locate in the mount pad around in rectangular shape hole, the rectangular front end of installation is fixed mutually with rectangular shape hole front end, the cover is equipped with the fourth spring of a compressed on the installation is rectangular, fourth spring rear end offsets with the mount pad rear portion and leans on, fourth spring front end supports with rectangular shape hole front end and leans on, make the fourth spring can promote the jam plate forward, support to lean on mutually with the mount pad until spacing post.

Further, the safety interlock device of preceding lower door of cubical switchboard wherein: the lock pin is a screw rod which is in threaded connection with the front lower door.

The invention has the advantages that: the safety interlocking device for the front lower door of the switch cabinet can interlock the switch of the front lower door of the switch cabinet and the opening and closing of the grounding switch, so that the valve can be pressed down without shielding the operation hole after the front lower door is closed, the operation shaft can be rotated to open the grounding switch, and the front lower door can be locked and cannot be opened after the grounding switch is opened; after the grounding switch is switched on by rotating the operating shaft, the front lower door can be opened, and after the front lower door is opened, the valve cannot be pressed down, so that the operating shaft cannot be rotated to switch off the grounding switch when the front lower door is opened, and the safety of the switch cabinet is greatly improved; in addition, the safety interlocking device of the front lower door of the switch cabinet is suitable for both a high-voltage switch cabinet and a low-voltage switch cabinet.

Drawings

FIG. 1 is a schematic view of a safety interlock device for a front lower door of a switch cabinet according to the present invention in a state when the front lower door is locked.

Fig. 2 is a schematic view of the safety interlock device for the front lower door of the switch cabinet, according to the present invention, when the front lower door is unlocked.

Fig. 3 is a schematic view of the safety interlock device for the front lower door of the switch cabinet according to the present invention in a state when the front lower door is opened.

Fig. 4 is a schematic view of the state where the operation hole is blocked by the locking bar and the shutter.

Detailed Description

The present invention will be described in further detail below with reference to specific embodiments and the attached drawings.

As shown in fig. 1, a safety interlock device for a front lower door of a switchgear cabinet comprises: an operating shaft 11 arranged in a switch cabinet body 1, after the operating shaft 11 is rotated forwards and backwards, a grounding switch in the switch cabinet can be driven to be switched off or switched on, an operating hole 2 for rotating the operating shaft 11 is formed in the front cabinet wall of the switch cabinet body 1, and a driving end of the operating shaft 11 can be exposed out of the operating hole 2, so that an operating handle can be butted with the driving end of the operating shaft 11 by penetrating through the operating hole 2, and the operating shaft 11 can be driven to rotate by shaking the operating handle; the cabinet body 1 is also provided with a valve 3 which can shield the operation hole 2 and is reset by a first spring 31, when external force overcomes the elastic force of the first spring 31, the valve 3 can move downwards to the position which does not shield the operation hole 2, the valve 3 can reset to the position which shields the operation hole 2 under the action of the first spring 31, and after the valve 3 shields the operation hole 2, an operation handle can be blocked by the valve 3 and cannot pass through the operation hole 2 to be in butt joint with the driving end of the operation shaft 11, so that the operation shaft 11 cannot be driven to rotate; a mounting rack 4 positioned below the operating shaft 11 is arranged on the cabinet body 1 at the front lower door of the switch cabinet, a lifting rod 5 and a valve baffle 6 which can move back and forth and is reset by a second spring 61 are arranged on the mounting frame 4 in a penetrating way, the valve baffle 6 can extend forwards and reset to the position for blocking the valve 3 from moving downwards under the action of the second spring 61, so that the reset valve 3 can not be pressed downwards, a mounting base 51 is fixed on the lifting rod 5, a locking plate 7 which can move back and forth is arranged on the mounting base 51 in a penetrating way, the locking plate 7 is provided with a locking groove 71 with an upward opening and positioned at the front end of the locking plate 7 and an abutting step 72 positioned at the rear of the locking groove 71, an elastic extending mechanism which can enable the locking plate 7 to elastically extend forwards out of the avoidance hole 12 on the front cabinet wall of the cabinet body 1 is arranged between the locking plate 7 and the mounting seat 51, an elastic pushing mechanism which can enable the lifting rod 5 to elastically extend upwards is arranged between the lifting rod 5 and the mounting frame 4; a cam 13 positioned above the lifting rod 5 is arranged on the operating shaft 11, the operating shaft 11 is rotated to enable the cam 13 to press the lifting rod 5 when the grounding switch is switched on, so that the lifting rod 5 drives the locking plate 7 to move downwards, the operating shaft 11 is rotated reversely to enable the cam 13 not to press the lifting rod 5 when the grounding switch is switched off, the lifting rod 5 drives the locking plate 7 to reset upwards, a lock pin 81 is arranged on the inner side of the front lower door 8, and in the embodiment, the lock pin 81 is a screw rod connected to the front lower door 8 in a threaded mode; when the front lower door 8 is closed, the front lower door 8 presses the locking plate 7, so that the locking plate 7 moves backwards, and the lock pin 81 is positioned right above the lock groove 71; as shown in fig. 1, when the front lower door 8 is locked and the operating shaft 11 makes the ground switch in the open state, the shutter baffle 6 is pushed by the locking plate 7 and then moves to a position where the shutter 3 is not blocked, the lifting rod 5 drives the locking plate 7 to return upwards to a position where the locking groove 71 blocks the locking pin 81, and at this time, the abutting step 72 abuts and then moves to the rear of the avoiding hole 12 and is higher than the avoiding hole 12 along with the upward return of the locking plate 7, so that the locking plate 7 can abut against the inner wall of the cabinet 1 through the abutting step 72 and cannot be pulled out; as shown in fig. 2, when the front lower door 8 needs to be opened, the shutter 3 is pressed downward, then the operating shaft 11 is rotated to change the earthing switch from open to close, after closing, the shutter 3 is released to reset the shutter 3, after closing, the operating shaft 11 drives the lower cam 13 to press the lifting rod 5 to drive the locking plate 7 to move down to the position where the locking groove 71 is separated from the locking pin 81, and meanwhile, the abutting step 72 also moves down to the position where the avoiding hole 12 can extend, and then the front lower door 8 can be opened, as shown in fig. 3, as the front lower door 8 is opened, the locking plate 7 extends forward to reset under the action of the elastic extending mechanism, and meanwhile, the shutter baffle 6 also extends forward to reset to the position where the shutter 3 can be blocked from moving down under the action of the second spring 61.

In practical applications, when the front lower door 8 is manually closed but unlocked, in order to prevent the closed front lower door 8 from being pushed open by the locking plate 7 when a person rotates the operating shaft 11 to open the grounding switch, the closed front lower door 8 is temporarily fixed to the cabinet by screws, and then the grounding switch is disconnected from the ground by rotating the operating shaft 11.

In this embodiment, as shown in fig. 4, a locking bar 9 is hinged to the outer side of the front cabinet wall on one side of the operation hole 2, the locking bar 9 can swing to shield the operation hole 2, a locking plate 91 is arranged on the outer side of the front cabinet wall on the other side of the operation hole 2, a first upper locking hole 92 is arranged on the locking plate 91, a second upper locking hole 93 is arranged on the outer end of the locking bar 9, when the locking bar 9 swings to a position of shielding the operation hole 2, the first upper locking hole 92 and the second upper locking hole 93 can be aligned with each other, so that the locking bar 9 can be locked by the locking device through the first upper locking hole 92 and the second upper locking hole 93, thereby the locking bar 9 can be locked at a position of shielding the operation hole 2, and the operation shaft 11 cannot be operated to rotate. The keys of the lock are kept by professional maintainers, so that the switch cabinet can be prevented from being opened by non-professional persons.

As shown in fig. 1, the pushing structure between the locking plate 7 and the shutter 6 is: a vertical plate 62 is arranged on the shutter baffle 6, a transverse plate 73 positioned in front of the vertical plate 62 is arranged on the locking plate 7, and when the locking plate 7 moves backwards, the transverse plate 73 can abut against the vertical plate 62, so that the locking plate 7 can overcome the elastic force of the second spring 61 and push the shutter baffle 6 backwards.

The structure of the elastic pushing mechanism comprises: set up an upper limit pin 52 and a lower limit pin 53 on lifter 5, upper limit pin 52 is located the top of mounting bracket 4, lower limit pin 53 is located the below of mounting bracket 4, the cover is equipped with a compressed third spring 54 on lifter 5 between upper limit pin 52 and mounting bracket 4, the both ends of third spring 54 respectively with last limit pin 52 and mounting bracket 4 counterbalance, make third spring 54 can promote lifter 5 to rise, until lower limit pin 53 and mounting bracket 4 counterbalance and lean on.

The structure of the elastic extension mechanism comprises: set up rectangular shape hole 74 and spacing post 75 of a fore-and-aft trend on jam plate 7, spacing post 75 is located the rear of mount pad 51, be provided with the installation rectangular 76 of a fore-and-aft trend and wearing to locate in mount pad 51 in rectangular shape hole 74, the front end of installing rectangular 76 is fixed with rectangular shape hole 74 front end, the cover is equipped with a compressed fourth spring 77 on rectangular 76 of installation, fourth spring 77 rear end offsets with the mount pad 51 rear portion and leans on, fourth spring 77 front end supports with rectangular shape hole 74 front end and leans on, make fourth spring 77 can promote jam plate 7 forward, lean on with mount pad 51 counterbalance until spacing post 75.

The interlocking function of the safety interlock device of the present invention is as follows: the front lower door 8 can be pressed down without shielding the operation hole 2 after the front lower door 8 is closed, so that the operation shaft 11 can be rotated to open the grounding switch, and the front lower door 8 can be locked and cannot be opened after the grounding switch is opened; after the earthing switch is switched on by rotating the operating shaft 11, the front lower door 8 can be opened, and after the front lower door 8 is opened, the valve 3 cannot be pressed down, so that the operating shaft 11 cannot be rotated to switch off the earthing switch when the front lower door 8 is opened.

Claims (6)

1. A safety interlock for a front lower door of a switchgear comprising: install the operating axis in the cubical switchboard cabinet body, can drive earthing switch separating brake or combined floodgate in the cubical switchboard behind the positive, reversal operating axis, its characterized in that: an operation hole for rotating an operation shaft is formed in the front cabinet wall of the switch cabinet body, a valve capable of shielding the operation hole and reset by a first spring is further arranged on the cabinet body, when external force overcomes the elastic force of the first spring, the valve can move downwards to a position where the operation hole is not shielded, and the valve can reset to a position where the operation hole is shielded under the action of the first spring; the switch cabinet is characterized in that a mounting frame which is positioned below an operating shaft is arranged on a cabinet body at the front lower door of the switch cabinet, a lifting rod and a valve baffle which can move back and forth and is reset by a second spring are arranged on the mounting frame in a penetrating manner, the valve baffle can extend forwards under the action of the second spring and reset to a position for blocking the valve from moving downwards, a mounting seat is fixed on the lifting rod, a locking plate which can move back and forth is arranged on the mounting seat in a penetrating manner, a locking groove which is provided with an upward opening and is positioned at the front end of the locking plate and an abutting step which is positioned behind the locking groove are arranged on the locking plate, an elastic extending mechanism which can enable the locking plate to elastically extend forwards out of an avoiding hole in the front cabinet wall of the cabinet body is arranged between the locking plate and the mounting seat, and an elastic pushing mechanism which can enable the lifting rod to; the operating shaft is provided with a cam positioned above the lifting rod, the operating shaft is rotated to enable the cam to press the lifting rod when the grounding switch is switched on, so that the lifting rod drives the locking plate to move downwards, the operating shaft is rotated reversely to enable the cam not to press the lifting rod when the grounding switch is switched off, the lifting rod drives the locking plate to reset upwards, and the inner side of the front lower door is provided with a locking pin; when the front lower door is closed, the front lower door presses the locking plate to enable the locking plate to move backwards, and the lock pin is located right above the lock groove; when the lower door is closed and locked and the grounding switch is in a brake-off state due to the operation shaft, the valve baffle plate is pushed by the locking plate and then moves to a position where the valve is not blocked, the lifting rod drives the locking plate to reset upwards to a position where the locking groove blocks the locking pin, at the moment, the abutting step moves backwards to the rear of the avoiding hole and is higher than the avoiding hole along with the upward resetting of the locking plate, and therefore the locking plate can abut against the step and is abutted against the inner wall of the cabinet body and cannot be pulled out; when the front lower door needs to be opened, the valve is pressed downwards, then the operating shaft is rotated to enable the grounding switch to be switched from open to closed, the valve is loosened to enable the valve to reset after the closed, the operating shaft drives the lower cam to press the lifting rod to drive the lock plate to move downwards to the position where the lock groove is separated from the lock pin, meanwhile, the lower cam is pressed against the step to move downwards to the position where the avoiding hole can be extended, then the front lower door can be opened, the lock plate can extend forwards to reset under the action of the elastic extension mechanism along with the opening of the front lower door, and meanwhile, the valve baffle also extends forwards to reset to the position where the valve can be stopped to move downwards under the action of the second spring.

2. The safety interlock device for a front lower door of a switch cabinet according to claim 1, characterized in that: articulated on the preceding cabinet wall outside of handle hole one side have a locking strip, the locking strip can swing to sheltering from the handle hole, be provided with a lockplate on the preceding cabinet wall outside of handle hole opposite side, be provided with a first lockhole of going up on the lockplate, lockhole on being provided with a second on the locking strip outer end, the locking strip swings to when sheltering from the position of handle hole, lockhole can align each other on first lockhole and the second, make the locking strip can be through first, the second is locked the lockhole by the tool to lock, thereby make the locking strip can be locked in the position of sheltering from the handle hole.

3. A safety interlock device for a front lower door of a switchgear cabinet according to claim 1 or 2, wherein: the pushing structure between the locking plate and the valve baffle is as follows: the valve baffle is provided with a vertical plate, the locking plate is provided with a transverse plate positioned in front of the vertical plate, and when the locking plate moves backwards, the transverse plate can be abutted against the vertical plate, so that the locking plate can overcome the elastic force of the second spring and push the valve baffle backwards.

4. A safety interlock device for a front lower door of a switchgear cabinet according to claim 1 or 2, wherein: the structure of the elastic pushing mechanism comprises: set up a spacer pin and a lower spacer pin on the lifter, go up the spacer pin and be located the top of mounting bracket, lower spacer pin is located the below of mounting bracket, and the cover is equipped with a compressed third spring on the lifter between last spacer pin and mounting bracket, and the both ends of third spring are supported with last spacer pin and mounting bracket respectively and are leaned on for the third spring can promote the lifter and rise, and the spacer pin is leaned on with the mounting bracket counterbalance under until.

5. A safety interlock device for a front lower door of a switchgear cabinet according to claim 1 or 2, wherein: the structure of the elastic extension mechanism comprises: set up rectangular shape hole and spacing post of a fore-and-aft trend on the jam plate, spacing post is located the rear of mount pad, it is rectangular to be provided with the installation of moving towards and wearing to locate in the mount pad around in rectangular shape hole, the rectangular front end of installation is fixed mutually with rectangular shape hole front end, the cover is equipped with the fourth spring of a compressed on the installation is rectangular, fourth spring rear end offsets with the mount pad rear portion and leans on, fourth spring front end supports with rectangular shape hole front end and leans on, make the fourth spring can promote the jam plate forward, support to lean on mutually with the mount pad until spacing post.

6. A safety interlock device for a front lower door of a switchgear cabinet according to claim 1 or 2, wherein: the lock pin is a screw rod which is in threaded connection with the front lower door.

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