CN110993420A

CN110993420A - Safety interlocking device of switch cabinet

Info

Publication number: CN110993420A
Application number: CN201911271609.1A
Authority: CN
Inventors: 巫珏
Original assignee: Jiangsu Tiangang Cabinet Co ltd
Current assignee: Jiangsu Tiangang Cabinet Co ltd
Priority date: 2019-12-12
Filing date: 2019-12-12
Publication date: 2020-04-10

Abstract

The invention discloses a safety interlocking device of a switch cabinet, which comprises: operating shaft, back door interlocking device: the rear door is provided with a rear mounting frame on the cabinet body, the rear mounting frame is provided with a lock rod with the rear end hinged with a lock hook, a driving frame fixed with the lock rod is arranged in front of the rear mounting frame, the rear mounting frame is provided with an elastic pressing mechanism, a middle mounting frame with a driving rod is arranged in the cabinet body, one side of the driving rod is provided with an interlocking rod fixed with the driving rod, the driving rod and the driving frame are driven by a driving rod, the rear door is provided with a lock column with a notch, and an operating shaft; front lower door interlocking mechanism: the cabinet body is provided with an operation hole and a valve; a front mounting frame with a lifting rod and a valve baffle is arranged on the cabinet body at the front lower door, a mounting seat is fixed on the lifting rod, a locking plate with a locking groove and abutting against the step is arranged on the mounting seat in a penetrating manner, an elastic extending mechanism is arranged between the locking plate and the mounting seat, and an elastic pushing mechanism is arranged between the lifting rod and the front mounting frame; the operating shaft is provided with a cam, and the front lower door is provided with a lock pin. The device can improve the safety of the switch cabinet.

Description

Safety interlocking device of switch cabinet

Technical Field

The invention relates to the field of switch cabinets, in particular to a safety interlocking device of a 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 of a switch cabinet is provided, which can make the switches of a rear door and a front lower door of the switch cabinet interlocked with the opening and closing of a grounding switch respectively.

In order to solve the problems, the technical scheme adopted by the invention is as follows: a safety interlock for a switchgear cabinet, 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: further comprising: back door interlocking device and preceding lower door interlocking device, back door interlocking device's structure includes: a rear mounting rack arranged on the cabinet body at the rear door of the switch cabinet, a lock rod capable of moving back and forth is arranged on the rear mounting rack in a penetrating way, a lock hook capable of swinging up and down is hinged at the rear end of the lock rod and is positioned at the rear part of the rear mounting rack, a driving rack is arranged in front of the rear mounting rack, the lock rod is fixed with the driving rack so that the lock rod can drive the driving rack to move back and forth together, an elastic pressing mechanism capable of elastically pressing the driving rack backwards to enable the driving rack to abut against the rear mounting rack is also arranged on the rear mounting rack, a middle mounting rack is arranged in the cabinet body of the switch cabinet, a driving rod capable of moving back and forth is arranged on the middle mounting rack in a penetrating way, an interlocking rod is arranged at one side of the driving rod and is fixed with the driving rod so that the driving rod, so that the driving frame can drive the driving rod to move back and forth together, a lock column is arranged on the inner side of the rear door of the switch cabinet, the lower part of the lock post is provided with a gap, when the back door is closed, the lock post can overcome the elasticity of the elastic pressing mechanism to push the lock rod forwards under the driving of the back door, so that the lock rod can drive the lock hook and the driving frame to move forwards together, the lock hook can swing upwards by the abutting of the front lower part of the lock hook and the rear mounting frame after moving forwards, so that the lock hook can be hooked in the gap at the lower part of the lock column, the driving frame can drive the driving rod to drive the interlocking rod to move forwards through the driving rod after moving forwards, a stop block positioned on one side of the interlocking rod is arranged on the side surface of the operating shaft, when the rear door is opened, the interlocking rod can stop the stop block to enable the operating shaft not to rotate towards the direction of opening the grounding switch, and therefore closing and grounding of the grounding switch are guaranteed when the rear door is opened; when the rear door is closed, the interlocking rod can move forwards under the driving of the driving rod, so that the interlocking rod does not block the stop block, and the operating shaft can rotate towards the direction of opening the grounding switch; when the operating shaft is rotated to enable the grounding switch to be disconnected from the ground, the stop block can move to the rear of the interlocking rod to stop the interlocking rod, so that the interlocking rod cannot move backwards, the elastic pressing mechanism cannot reset the locking hook, and the locking hook can enable the back door to be prevented from being opened after the grounding switch is disconnected by hooking the locking column; the front lower door interlocking mechanism has the structure 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 front 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 front mounting frame in a penetrating manner, the valve baffle can extend forwards and reset to the position where the valve can move downwards under the action of the second spring, 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 elastically extend; 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 cubical switchboard of the aforesaid, wherein: the structure of the elastic pressing mechanism comprises: move towards the spring post of wearing to locate on after-mounting frame and the drive frame around one, be provided with one on the rear end of spring post and block the boss, the cover is equipped with a reset spring on blocking the spring post between boss and the after-mounting frame, reset spring's both ends respectively with block boss and after-mounting frame counterbalance and lean on, make reset spring can push away the spring post backward, it has one to be located drive frame the place ahead and pushes away the nut with the drive frame counterbalance and lean on to go back threaded connection on the spring post, the drive frame is pressed backward through pushing away the nut to the spring post.

Further, the safety interlock device of cubical switchboard of the aforesaid, wherein: the front part of the rear mounting frame is also provided with a guide plate, the guide plate is provided with two guide holes, the front end of the lock rod penetrates through one guide hole, the front end of the spring column penetrates through the other guide hole, and the two guide holes can respectively guide the lock rod and the spring column in the front and back directions.

Further, the safety interlock device of cubical switchboard of the aforesaid, wherein: an anti-jamming spring capable of helping the locking hook to reset is arranged between the locking hook and the rear end of the locking rod, and two ends of the anti-jamming spring are respectively abutted against the rear ends of the locking hook and the locking rod.

Further, the safety interlock device of cubical switchboard of the aforesaid, wherein: the rear end face of the lock column is provided with a threaded hole, the rear door is provided with a mounting hole, the bolt penetrates through the mounting hole from the outer side of the rear door and is screwed into the threaded hole in the rear end of the lock column, the lock column can be mounted on the inner side of the rear door, the outer side of the rear door is further provided with an indicating cover covering the mounting hole, the indicating cover is lifted to expose the bolt, and then the bolt can be dismounted from the outer side of the rear door, so that the lock column is dismounted.

Further, the safety interlock device of cubical switchboard of the aforesaid, wherein: and a limiting step which can be used for the front lower part of the lock hook to abut against when the lock hook hooks the lock column is arranged on the rear lower part of the rear mounting frame.

Further, the safety interlock device of cubical switchboard of the aforesaid, 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 cubical switchboard of the aforesaid, 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 cubical switchboard of the aforesaid, 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 top of spacer pin position in the front of the mounting bracket, the below of mounting bracket is located before the lower spacer pin, the cover is equipped with a compressed third spring on the lifter between last spacer pin and preceding mounting bracket, the both ends of third spring respectively with last spacer pin and preceding mounting bracket offset lean on for the third spring can promote the lifter to rise, until the spacer pin supports with preceding mounting bracket and lean on down.

Further, the safety interlock device of cubical switchboard of the aforesaid, 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.

The invention has the advantages that: the safety interlocking device of the switch cabinet can interlock the switch of the rear door of the switch cabinet and the opening and closing of the grounding switch on one hand, so that the rear door can be opened only after the grounding switch is closed and grounded, the grounding switch cannot be opened to disconnect the brake and the ground after the rear door is opened, the grounding switch can be opened to disconnect the brake and the ground only after the rear door is closed, and the rear door cannot be opened after the grounding switch is opened to disconnect the ground; on the other hand, the switch of the front lower door of the switch cabinet is interlocked with 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; thus, the safety of the switch cabinet is greatly improved; in addition, the safety interlocking device 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 rear door interlock mechanism according to the present invention in a state where a rear door is opened.

Fig. 2 is a schematic top view of the structure of fig. 1.

FIG. 3 is a schematic sectional view of the structure at A-A in FIG. 1.

FIG. 4 is a schematic view of the rear door interlock mechanism of the present invention in a rear door closed latch timing condition.

FIG. 5 is a schematic structural view of a section B-B in FIG. 4.

FIG. 6 is a schematic structural view of a section C-C in FIG. 4.

Fig. 7 is a schematic view of the front lower door interlocking mechanism according to the present invention in a state where the front lower door is locked.

FIG. 8 is a schematic view of the front lower door interlock mechanism of the present invention in a state when the front lower door is unlocked.

Fig. 9 is a schematic view of the front lower door interlocking mechanism according to the present invention in a state where the front lower door is opened.

Fig. 10 is a schematic view showing a 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.

A safety interlock for a switchgear cabinet, comprising: install the operating axis 11 of the front and back trend in the cubical switchboard cabinet body 1, just, can drive earthing switch separating brake or closing a floodgate in the cubical switchboard behind the reversal operating axis 11, still include: a rear door interlocking mechanism and a front lower door interlocking mechanism.

As shown in fig. 1, 2, 3, 4, 5, and 6, the rear door interlock mechanism includes: a rear mounting frame 92 arranged on the cabinet body at the rear door 97 of the switch cabinet, a lock rod 93 capable of moving back and forth is arranged on the rear mounting frame 92 in a penetrating way, a lock hook 931 capable of swinging up and down is hinged on the rear end of the lock rod 93, the lock hook 931 is positioned at the rear part of the rear mounting frame 92, a driving frame 94 is arranged in front of the rear mounting frame 92, the lock rod 93 is fixed with the driving frame 94, so that the lock rod 93 can move back and forth together with the driving frame 94, an elastic pressing mechanism capable of elastically pressing the driving frame 94 backwards to enable the driving frame 94 to be abutted against the rear mounting frame 92 is also arranged on the rear mounting frame 92, a middle mounting frame 95 is arranged inside the cabinet body 1 of the switch cabinet, a driving rod 951 capable of moving back and forth is arranged on the middle mounting frame 95 in a penetrating way, an interlocking rod 951 is arranged on one side of the driving rod 951, the interlocking rod 952 is, in this embodiment, the interlock rod 952 and the driving rod 951 are fixed by screws, the driving rod 951 and the driving rack 94 are connected and driven by the driving rod 96, so that the driving rack 94 can move back and forth with the driving rod 951, a lock post 971 is arranged on the inner side of the rear door 97 of the switch cabinet, a notch 972 is arranged on the lower part of the lock post 971, when the rear door 97 is closed, the lock post 971 can push the lock rod 93 forward against the elastic force of the elastic pressing mechanism under the driving of the rear door 97, so that the lock rod 93 can move forward with the lock hook 931 and the driving rack 94, the lock hook 931 can swing upward by abutting against the rear mounting rack 92 through the front lower part thereof after moving forward, so that the lock hook 931 can be hooked in the notch 972 on the lower part of the lock post 971, the driving rod 951 can be driven by the driving rod 96 to move forward with the driving rod 952 after moving forward, a stopper 912 is arranged on one side of the interlock rod 952 on the, when the rear door 97 is opened, the interlocking rod 952 can block the stopper 912 to prevent the operating shaft 11 from rotating in the direction of opening the grounding switch, so that the grounding switch is switched on and grounded when the rear door 97 is opened; when the rear door 97 is closed, the interlocking rod 952 moves forward under the driving of the driving rod 951, so that the interlocking rod 952 does not block the stopper 912, and the operating shaft 11 can rotate towards the direction of opening the grounding switch; when the operating shaft 11 is rotated to disconnect the ground switch from the ground, the stopper 912 moves to the rear of the interlock rod 952 to block the interlock rod 952, so that the interlock rod 952 cannot move backward, the elastic pressing mechanism cannot reset the latch hook 931, and the latch hook 931 can hook the latch post 971 to prevent the rear door 97 from being opened after the ground switch is disconnected.

In practical application, the driving end of the operating shaft 11 is located at the front part of the switch cabinet, the rear door 97 is located at the rear part of the switch cabinet, when the rear door 97 is manually closed but the grounding switch is not opened and grounded, in order to prevent the closed rear door 97 from being pushed open by the lock rod 93 when a person leaves the operation shaft 11 for rotating, the closed rear door 97 is temporarily fixed with the cabinet body through screws, and then the grounding switch is opened and grounded when the operation shaft 11 is rotated.

In the present embodiment, as shown in fig. 2 and 5, the structure of the elastic pressing mechanism includes: a spring post 98 passing through the rear mounting frame 92 and the driving frame 94 is arranged in a front-back direction, a blocking boss 981 is arranged at the rear end of the spring post 98, a return spring 982 is sleeved on the spring post 98 between the blocking boss 981 and the rear mounting frame 92, two ends of the return spring 982 are respectively abutted against the blocking boss 981 and the rear mounting frame 92, so that the return spring 982 can push the spring post 98 backwards, a pushing nut 983 which is positioned in front of the driving frame 94 and abutted against the driving frame 94 is further in threaded connection with the spring post 98, and the driving frame 94 is pressed backwards by the spring post 98 through the pushing nut 983.

As shown in fig. 2 and 5, a guide plate 913 is further disposed at the front portion of the rear mounting bracket 92, two guide holes are disposed on the guide plate 913, the front end of the lock rod 93 passes through one guide hole, the front end of the spring post 98 passes through the other guide hole, and the two guide holes can respectively guide the lock rod 93 and the spring post 98 forward and backward.

As shown in fig. 5, the fixing structure between the lock lever 93 and the driving bracket 94 is: the locking rod 93 is provided with an installation step, the locking rod 93 penetrates through the driving frame 94, the driving frame 94 abuts against the installation step, the locking rod 93 is further in threaded connection with a locking nut 932, and the locking nut 932 can lock and press the driving frame 94 between the locking nut 932 and the installation step, so that the driving frame 94 and the locking rod 93 are fixed.

As shown in fig. 1 and 4, an anti-seize spring 933 for assisting the reset of the lock hook 931 is disposed between the lock hook 931 and the rear end of the lock lever 93, and both ends of the anti-seize spring 933 respectively abut against the lock hook 931 and the rear end of the lock lever 93. The anti-seize spring 933 can help the latch hook 931 to reset, preventing the latch hook 931 from seizing and failing to swing downward.

As shown in fig. 1 and 4, a screw hole is provided on the rear end surface of the lock post 971, a mounting hole is provided on the rear door 97, the lock post 971 can be mounted on the inner side of the rear door 97 by screwing a bolt 973 into the screw hole on the rear end of the lock post 971 through the mounting hole from the outer side of the rear door 97, an indication cover 974 covering the mounting hole is further provided on the outer side of the rear door 97, and the bolt 973 can be detached from the outer side of the rear door 97 by lifting the indication cover 974 to expose the bolt 973, thereby detaching the lock post 971. This is provided for emergency unlocking of the rear door 97 when the interlock is stuck and the rear door 97 cannot be opened.

A limiting step 921 is provided on the rear lower portion of the rear mounting frame 92 for allowing the front lower portion of the latch hook 931 to abut when the latch hook 931 hooks the latch post 971. This arrangement provides for a more reliable operation of the latch 931.

The rear door interlocking mechanism of the invention has the following functions: the rear door 97 can be opened only after the grounding switch is switched on and grounded, after the rear door 97 is opened, the grounding switch cannot be switched off and grounded, only after the rear door 97 is closed, the grounding switch can be switched off and grounded, and after the grounding switch is switched off and grounded, the rear door 97 cannot be opened.

As shown in fig. 7, the front lower door interlock mechanism has the structure: an operation hole 2 for rotating an operation shaft 11 is formed in the front cabinet wall of a switch cabinet body 1, and a driving end of the operation shaft 11 can be exposed out of the operation hole 2, so that an operation handle can be butted with the driving end of the operation shaft 11 by penetrating through the operation hole 2, and the operation shaft 11 can be driven to rotate by shaking the operation 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 front 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 front mounting frame 4 in a penetrating way, the valve baffle 6 can extend forwards under the action of the second spring 61 to reset to a position for blocking the valve 3 from moving downwards, 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 front mounting rack 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. 7, 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 moves backwards 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. 8, 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. 9, 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. 10, a lock bar 9 is hinged to the outer side of the front cabinet wall on one side of the operation hole 2, the lock bar 9 can swing to shield the operation hole 2, a lock plate 919 is arranged on the outer side of the front cabinet wall on the other side of the operation hole 2, a first upper lock hole 929 is arranged on the lock plate 919, a second upper lock hole 939 is arranged on the outer end of the lock bar 9, when the lock bar 9 swings to a position of shielding the operation hole 2, the first upper lock hole 929 and the second upper lock hole 939 can be aligned with each other, so that the lock bar 9 can be locked by the locking device through the first upper lock hole 929 and the second upper lock hole 939, so that the lock bar 9 can be locked at the 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. 7, 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 a last spacer pin 52 and a lower spacer pin 53 on lifter 5, go up the top that spacer pin 52 is located preceding mounting bracket 4, lower spacer pin 53 is located the below of preceding mounting bracket 4, the cover is equipped with a compressed third spring 54 on lifter 5 between last spacer pin 52 and preceding mounting bracket 4, the both ends of third spring 54 respectively with last spacer pin 52 and preceding mounting bracket 4 counterbalance, make third spring 54 can promote lifter 5 to rise, until lower spacer pin 53 and preceding mounting bracket 4 counterbalance.

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 front lower door interlocking mechanism has the following functions: only after the front lower door 8 is closed, the valve 3 can be pressed down without shielding the operation hole 2, 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

1. A safety interlock for a switchgear cabinet, 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: further comprising: back door interlocking device and preceding lower door interlocking device, back door interlocking device's structure includes: a rear mounting rack arranged on the cabinet body at the rear door of the switch cabinet, a lock rod capable of moving back and forth is arranged on the rear mounting rack in a penetrating way, a lock hook capable of swinging up and down is hinged at the rear end of the lock rod and is positioned at the rear part of the rear mounting rack, a driving rack is arranged in front of the rear mounting rack, the lock rod is fixed with the driving rack so that the lock rod can drive the driving rack to move back and forth together, an elastic pressing mechanism capable of elastically pressing the driving rack backwards to enable the driving rack to abut against the rear mounting rack is also arranged on the rear mounting rack, a middle mounting rack is arranged in the cabinet body of the switch cabinet, a driving rod capable of moving back and forth is arranged on the middle mounting rack in a penetrating way, an interlocking rod is arranged at one side of the driving rod and is fixed with the driving rod so that the driving rod, so that the driving frame can drive the driving rod to move back and forth together, a lock column is arranged on the inner side of the rear door of the switch cabinet, the lower part of the lock post is provided with a gap, when the back door is closed, the lock post can overcome the elasticity of the elastic pressing mechanism to push the lock rod forwards under the driving of the back door, so that the lock rod can drive the lock hook and the driving frame to move forwards together, the lock hook can swing upwards by the abutting of the front lower part of the lock hook and the rear mounting frame after moving forwards, so that the lock hook can be hooked in the gap at the lower part of the lock column, the driving frame can drive the driving rod to drive the interlocking rod to move forwards through the driving rod after moving forwards, a stop block positioned on one side of the interlocking rod is arranged on the side surface of the operating shaft, when the rear door is opened, the interlocking rod can stop the stop block to enable the operating shaft not to rotate towards the direction of opening the grounding switch, and therefore closing and grounding of the grounding switch are guaranteed when the rear door is opened; when the rear door is closed, the interlocking rod can move forwards under the driving of the driving rod, so that the interlocking rod does not block the stop block, and the operating shaft can rotate towards the direction of opening the grounding switch; when the operating shaft is rotated to enable the grounding switch to be disconnected from the ground, the stop block can move to the rear of the interlocking rod to stop the interlocking rod, so that the interlocking rod cannot move backwards, the elastic pressing mechanism cannot reset the locking hook, and the locking hook can enable the back door to be prevented from being opened after the grounding switch is disconnected by hooking the locking column; the front lower door interlocking mechanism has the structure 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 front 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 front mounting frame in a penetrating manner, the valve baffle can extend forwards and reset to the position where the valve can move downwards under the action of the second spring, 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 elastically extend; 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. A safety interlock device for a switchgear cabinet according to claim 1, wherein: the structure of the elastic pressing mechanism comprises: move towards the spring post of wearing to locate on after-mounting frame and the drive frame around one, be provided with one on the rear end of spring post and block the boss, the cover is equipped with a reset spring on blocking the spring post between boss and the after-mounting frame, reset spring's both ends respectively with block boss and after-mounting frame counterbalance and lean on, make reset spring can push away the spring post backward, it has one to be located drive frame the place ahead and pushes away the nut with the drive frame counterbalance and lean on to go back threaded connection on the spring post, the drive frame is pressed backward through pushing away the nut to the spring post.

3. A safety interlock device for a switchgear cabinet according to claim 2, wherein: the front part of the rear mounting frame is also provided with a guide plate, the guide plate is provided with two guide holes, the front end of the lock rod penetrates through one guide hole, the front end of the spring column penetrates through the other guide hole, and the two guide holes can respectively guide the lock rod and the spring column in the front and back directions.

4. A safety interlock device for a switchgear cabinet according to claim 1, 2 or 3, characterized in that: an anti-jamming spring capable of helping the locking hook to reset is arranged between the locking hook and the rear end of the locking rod, and two ends of the anti-jamming spring are respectively abutted against the rear ends of the locking hook and the locking rod.

5. A safety interlock device for a switchgear cabinet according to claim 1, 2 or 3, characterized in that: the rear end face of the lock column is provided with a threaded hole, the rear door is provided with a mounting hole, the bolt penetrates through the mounting hole from the outer side of the rear door and is screwed into the threaded hole in the rear end of the lock column, the lock column can be mounted on the inner side of the rear door, the outer side of the rear door is further provided with an indicating cover covering the mounting hole, the indicating cover is lifted to expose the bolt, and then the bolt can be dismounted from the outer side of the rear door, so that the lock column is dismounted.

6. A safety interlock device for a switchgear cabinet according to claim 1, 2 or 3, characterized in that: and a limiting step which can be used for the front lower part of the lock hook to abut against when the lock hook hooks the lock column is arranged on the rear lower part of the rear mounting frame.

7. A safety interlock device for a switchgear cabinet according to claim 1, 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.

8. A safety interlock device for a switchgear cabinet according to claim 1 or 7, characterized in that: 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.

9. A safety interlock device for a switchgear cabinet according to claim 1 or 7, characterized in that: the structure of the elastic pushing mechanism comprises: set up a spacer pin and a lower spacer pin on the lifter, go up the top of spacer pin position in the front of the mounting bracket, the below of mounting bracket is located before the lower spacer pin, the cover is equipped with a compressed third spring on the lifter between last spacer pin and preceding mounting bracket, the both ends of third spring respectively with last spacer pin and preceding mounting bracket offset lean on for the third spring can promote the lifter to rise, until the spacer pin supports with preceding mounting bracket and lean on down.

10. A safety interlock device for a switchgear cabinet according to claim 1 or 7, characterized in that: 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.