Cabinet door interlocking device with reverse locking

Abstract

The invention discloses a cabinet door interlocking device with a reverse locking function. Comprising a compartment partition plate, a slidable interlocking sliding plate installed on the upper plate face of the compartment partition plate, a pair of parallel sliding plate guide rails fixed to the upper plate face of the compartment partition plate, an electromagnetic lock installation plate fixed to the upper surfaces of the sliding plate guide rails, an electromagnetic lock arranged on the electromagnetic lock installation plate and a reset spring, and one end of the reset spring is connected with the interlocking sliding plate. One end of the interlocking sliding plate is connected with an electromagnetic lock mounting plate, the other end of the interlocking sliding plate is connected with an electromagnetic lock mounting plate, an interlocking deflector rod is arranged on the lower plate surface of the interlocking sliding plate, a long sliding hole extending in the sliding direction of the interlocking sliding plate and an avoiding hole allowing a lock rod of the electromagnetic lock to stretch out and draw back are formed in the compartment partition plate, and the interlocking deflector rod penetrates through the long sliding hole downwards and can slide along the long sliding hole to drive the interlocking sliding plate to move front and back. The situation of false locking or failure of the electromagnetic lock can be avoided, and the risk of electric shock can be greatly reduced. The device is simple in structure, reliable in function and easy to implement, and can be suitable for most switch equipment and control equipment of middle and high voltage non-grounding switches.

Description

Technical Field

[0001] The present invention belongs to the technical field of five-protection interlocking of metal-enclosed switchgear and control equipment in the power industry, and in particular relates to a cabinet door interlocking device with reverse locking, which is suitable for locking the cabinet door of a cable room door with no switch or a two-position switch as an incoming line functional unit device. Background Art

[0002] "Five-protection interlocking" is an important safety design principle for high-voltage switchgear (such as high-voltage switchgear) in power systems, intended to prevent personal injury and equipment damage caused by improper operation. Relevant standards such as IEC 62271-200 and GB 3906 have set clear requirements for the interlocking of equipment. Therefore, when designing high-voltage switchgear, comprehensive mechanical and electrical interlocks are provided between the circuit breaker mechanism and the isolation mechanism, between the isolation switch operation and the earthing switch operation, and between the earthing switch operation and the cable room door. This prevents improper operation or accidental entry into live gaps from causing equipment damage or casualties. The cable room is a compartment in the entire switchgear where people are most likely to come into contact with high-voltage live parts and suffer electric shock. Therefore, the interlocking design of its compartment door is particularly important.

[0003] The circuit breaker unit solution, load switch unit solution, load switch-fuse combination electrical unit solution, and busbar PT cabinet solution with switches in the standard typical solution lock the cable room door through the grounding operation of the isolation grounding switch mechanism (usually a three-position mechanism). A stable, reliable, and easy-to-implement interlock is designed between the grounding switch and the cable room door.

[0004] However, there is another type of functional unit solution without a grounding switch: 1) a busbar lifting cabinet unit without a switch; 2) a two-position isolating switch circuit breaker unit as an incoming line (without a grounding switch to prevent the incoming line from being accidentally closed with the grounding switch energized). The locking design of the cable room door is difficult, and the existing implementation plans mainly include: 1) installing a mechanical padlock on the cable room door; 2) designing a complex mechanical locking device in the mechanism room; 3) installing an electromagnetic lock in the mechanism room to lock / unlock the cable room door in one direction by checking whether the incoming and outgoing cable sheaths are energized; 4) installing the electromagnetic lock on the cable room door, cooperating with the cabinet frame, and locking / unlocking the cable room door in one direction by checking whether the incoming and outgoing cable sheaths are energized.

[0005] Although the above method has played a role in preventing accidental entry into the live gap to a certain extent, it also has the following defects:

[0006] 1) Complex mechanical locking devices are difficult to install, have high coordination requirements, and are difficult to implement.

[0007] 2) By installing an electromagnetic lock to lock the cable compartment door in one direction, when the inlet and outlet cable bushings are energized and the cable compartment door is not closed, the electromagnetic lock still extends the locking rod, completing a "false lock", which can easily give the appearance of no power, which is quite dangerous for operators and maintenance personnel;

[0008] 3) Install the electromagnetic lock on the cable room door. When the cable room door is removed and the inlet and outlet cable casings are energized again, the electromagnetic lock will become invalid regardless of whether it is in the locked or unlocked state. Summary of the Invention

[0009] The object of the present invention is to provide a cabinet door interlock device with reverse locking which is stable and reliable, has a simple structure, is easy to implement and can greatly reduce the risk of electric shock to personnel.

[0010] The object of the present invention is achieved through the following technical measures: a cabinet door interlock device with reverse locking, characterized in that it includes a compartment partition, a slidable interlocking slide mounted on the upper surface of the compartment partition, a pair of parallel slide rails fixed on the upper surface of the compartment partition and placed on both sides of the interlocking slide, an electromagnetic lock mounting plate fixed on the upper surface of the slide rails, an electromagnetic lock and a reset spring with a warning function arranged on the electromagnetic lock mounting plate, the electromagnetic lock mounting plate is located above the interlocking slide, one end of the reset spring is connected to the interlocking slide, and the other end is connected to the electromagnetic lock mounting plate, an interlocking lever for cooperating with the upper lock plate of the cable room door panel is provided on the lower plate surface of the interlocking slide, and an elongated sliding hole extending along the sliding direction of the interlocking slide and a reset spring for the electromagnetic lock are provided on the compartment partition. The avoidance hole of the locking rod is retracted, and the interlocking lever passes downward through the elongated sliding hole and can slide along the elongated sliding hole to drive the interlocking slide plate to move back and forth. When the cable room door is open or not closed in place, the interlocking slide plate slides to the slide plate guide rail limit position under the action of the reset spring to block the avoidance hole, and when the cable room inlet and outlet wire casings are energized, the electromagnetic lock cannot be locked and is in a reverse locking warning state; when the cable room door is closed in place, the cable room door overcomes the pulling force of the reset spring to push the interlocking slide plate backward to expose the avoidance hole. When the cable room inlet and outlet wire casings are energized, the electromagnetic lock locking rod extends out of the avoidance hole and touches the lock plate and is in an electromagnetic lock locked state. At this time, the cable room door cannot be opened, and when the cable room inlet and outlet wire casings are not energized, the electromagnetic lock locking rod retracts from the avoidance hole and is in an electromagnetic lock unlocked state, and the cable room door can be opened.

[0011] When the electromagnetic lock is locked, the present invention can lock the cable room door so that it cannot be opened. However, before the cable room door is closed or not closed in place, the reverse locking function of the present invention can prevent the electromagnetic lock from completing the locking operation and trigger an early warning sound to warn of the current "live" state, reminding operators or maintenance personnel not to approach or touch the high-voltage live parts in the cable room; the buzzer warning will continue throughout the entire troubleshooting process and will not interrupt automatically. When the cause is found and the locking operation can be completed, the electric lock early warning function needs to be manually reset to stop the buzzer prompt. Therefore, the present invention can avoid the occurrence of "false locking" or failure of the electromagnetic lock, and can greatly reduce the risk of electric shock. The present invention has a simple structure, reliable function, and is easy to implement. It is applicable to most medium and high voltage switchgear and control equipment without grounding switches.

[0012] The width between the pair of skateboard guide rails of the present invention is slightly wider than the interlocking skateboard, which restricts the interlocking skateboard from moving forward and backward in a straight line; the thickness of the skateboard guide rails is greater than the thickness of the interlocking skateboard, and the electromagnetic lock mounting plate is an L-shaped plate, on the vertical surface of which an electromagnetic lock is installed, and the horizontal surface is fixed on the skateboard guide rails, and a through hole adapted to the lock rod is provided on the horizontal plate surface.

[0013] The front end of the compartment partition of the present invention is provided with a folded edge for positioning the slide rail and the electromagnetic lock mounting plate.

[0014] The interlocking slide of the present invention is provided with wings on both sides of the rear portion, and the wings can be engaged with the rear end of the slide guide rail to limit the forward movement of the interlocking slide.

[0015] The interlocking skateboard of the present invention is provided with a positioning hole at the midline position of the wing, the lower plate surface of the interlocking skateboard and the interlocking lever are positioned and pressed into one through the positioning hole, and a long opening is provided at the midline position of the front part of the interlocking skateboard.

[0016] The present invention provides a circular through hole at the front of the compartment partition for the electromagnetic lock rod to extend and retract. The circular through hole is concentric with the electromagnetic lock rod, and the hole diameter is slightly larger than the diameter of the lock rod; an elongated sliding hole is provided at the rear of the compartment partition, and the interlocking rod passes through the elongated sliding hole. The interlocking rod can slide in the elongated sliding hole, and the length of the elongated sliding hole is slightly larger than the sliding stroke of the interlocking rod.

[0017] The rear end of the interlocking slide of the present invention is provided with a folded edge and a first spring hanging hole is provided on the folded edge, the rear end of the horizontal surface of the electromagnetic lock mounting plate is provided with a folded edge and a second spring hanging hole is provided on the folded edge, and the two ends of the reset spring are respectively connected to the first spring hanging hole and the second spring hanging hole.

[0018] The interlocking slide plate, the electromagnetic lock mounting plate, the electromagnetic lock, the reset spring and the slide plate guide rail of the present invention are all installed in an independently arranged mechanism room.

[0019] The lock plate of the present invention is a bent plate, the top surface of which is the contact surface with the electromagnetic lock rod, and the rear end surface of which is the pushing surface for pushing the interlocking lever.

[0020] The cable room door panel of the present invention can be slidably installed on a pair of door panel guide rails arranged on the left and right sides of the cable room door. The lock plate is fixed on the top surface of the door panel, and a hanging tooth is provided on the back of the door panel. The door panel guide rail is provided with a hanging tooth hole for the hanging tooth to engage.

[0021] The electromagnetic lock described in the present invention has an early warning function. When the lock rod is in the non-locked position / unlocked position due to factors such as jamming or obstruction, the electromagnetic lock will sound a long buzzer warning and will not automatically interrupt the warning. After troubleshooting the cause, the buzzer warning must be manually restored to interruption.

[0022] Compared with the prior art, the present invention has the following significant effects:

[0023] ⑴ When the electromagnetic lock is locked, the present invention can lock the cable room door so that it cannot be opened. Before the cable room door is closed, the reverse locking function of the present invention can prevent the electromagnetic lock from completing the locking operation and trigger an early warning sound to warn of the current "live" state, reminding operators or maintenance personnel not to approach or touch the high-voltage live objects in the cable room. After eliminating the abnormality, the early warning needs to be manually released. Therefore, the present invention can avoid the occurrence of "false locking" or failure of the electromagnetic lock, and can greatly reduce the risk of electric shock. The present invention has a simple structure, reliable function, and is easy to implement. It is applicable to most medium and high voltage switchgear and control equipment without grounding switches.

[0024] (2) Compared with conventional one-way locking devices, the reverse locking function of the present invention in the open door state can perfectly prevent the electromagnetic lock from being "falsely locked" and giving the appearance that the cable room inlet and outlet bushings are not energized, greatly reducing the risk of operators and maintenance personnel accidentally entering the energized gap and causing electric shock.

[0025] (3) The early warning function of the present invention can reduce the occurrence of electromagnetic lock jamming and cable room door not closing / missing closing.

[0026] ⑷ The main part of the present invention is installed in the mechanism room and is installed separately from the cable room door assembly. Compared with the integrated installation method in which the electromagnetic lock is directly installed on the cable room door, the electromagnetic lock will not fail due to the removal of the cable room door.

[0027] (5) The electromagnetic lock of the present invention is installed in an independent mechanism compartment without other mechanisms, which has sufficient space and is easy to install. Even if the electromagnetic lock fails, the electromagnetic lock can be replaced safely without power outage.

[0028] (6) The present invention has a reverse locking function, which is applicable not only to electromagnetic locks but also to mechanical program locks. If the cable room door is not closed, the program lock cannot reach the locked state, the key cannot be pulled out, and the upper switch cannot be unlocked with this key to perform power supply operation, thereby ensuring that the inlet and outlet bushings of the cable room at this level are not energized. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Figure 1 is a side view of the present invention;

[0031] Figure 2 It is a front view of the present invention;

[0032] Figure 3 is a top view of the present invention;

[0033] Figure 4 yes Figure 3 Middle A is a partial enlarged schematic diagram;

[0034] Figure 5 This is a side view of the assembly of the compartment partition, interlocking slide, interlocking lever, electromagnetic lock mounting plate and return spring of the present invention;

[0035] Figure 6 Schematic diagram of the present invention in a door-closed and locked state;

[0036] Figure 7 It is a schematic diagram of the present invention in a closed and unlocked state;

[0037] Figure 8 It is a schematic diagram of the present invention in a reverse locking warning state;

[0038] Figure 9 yes Figure 8 Middle B is a partial enlarged schematic diagram.

[0039] In the figure: 1-electromagnetic lock mounting plate, 2-electromagnetic lock, 3-interlocking slide plate, 4-reset spring, 5-compartment partition, 6-interlocking lever, 7-slide plate guide rail, 8-cable room door assembly, 9-door panel guide rail, 10-door panel, 11-lock plate, 12-elongated sliding hole, 13-avoidance hole, 14-cable room, 15-locking rod, 16-elongated opening, 17-mechanism room, 18-hanging tooth, 19-hanging tooth hole, 20-through hole, 21-contact surface, 22-pushing surface, 23-screw, 24-wing, 25-air chamber. DETAILED DESCRIPTION

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0041] like Figures 1 to 9 As shown, the present invention provides a cabinet door interlock device with reverse locking, comprising a compartment partition 5 for separating a mechanism chamber 17 and a cable chamber 14, a slidable interlocking slide 3 installed on the upper surface of the compartment partition 5, a pair of parallel slide rails 7 fixed on the upper surface of the compartment partition 5 and placed on both sides of the interlocking slide 3, an electromagnetic lock mounting plate 1 fixed on the upper surface of the slide rail 7, an electromagnetic lock 2 with an early warning function and a reset spring 4 arranged on the electromagnetic lock mounting plate 1, the interlocking slide 3, the electromagnetic lock mounting plate 1, the electromagnetic lock 2, the reset spring 4 and the slide rail 7 are all installed in an independently arranged mechanism chamber 17 and located above the compartment partition 5. Behind the mechanism chamber 17 and the cable chamber 14 is the air chamber 25. The electromagnetic lock mounting plate 1 is located above the interlocking slide 3. One end of the return spring 4 is connected to the interlocking slide 3, and the other end is connected to the electromagnetic lock mounting plate 1. The lower plate surface of the interlocking slide 3 is provided with an interlocking lever 6 for cooperating with the lock plate 11 at the upper end of the cable chamber door panel 10. An elongated sliding hole 12 extending along the sliding direction of the interlocking slide 3 and an avoidance hole 13 for the lock rod 15 of the electromagnetic lock 2 to be retracted are provided on the compartment partition 5. The interlocking lever 6 passes downward through the elongated sliding hole 12 and can slide along the elongated sliding hole 12 to drive the interlocking slide 3 to move back and forth. When the cable chamber door is open or not closed in place, the interlock Under the action of the return spring 4, the slide plate 3 slides to the limit position of the slide plate guide rail 7 to block the avoidance hole 13, and when the cable room inlet and outlet bushings are energized, the electromagnetic lock cannot be locked and is in a reverse locking warning state; when the cable room door is closed, the cable room door overcomes the tension of the return spring and pushes the interlocking slide plate 3 backward to expose the avoidance hole 13. When the cable room inlet and outlet bushings are energized, the electromagnetic lock rod 15 extends out of the avoidance hole 13 and touches the lock plate 11 and is in an electromagnetic lock locked state. At this time, the cable room door cannot be opened. When the cable room inlet and outlet bushings are not energized, the electromagnetic lock rod 15 retracts from the avoidance hole 13 and is in an electromagnetic lock unlocked state. At this time, the cable room door can be opened.

[0042] A pair of slide rails 7 are fixed to the upper surface of the compartment partition 5 by screws 23. The interlocking slide 3 is located between the pair of slide rails 7 and is slidably connected thereto, allowing the interlocking slide 3 to be slidably mounted on the compartment partition 5. The thickness of the slide rails 7 is greater than that of the interlocking slide 3. The electromagnetic lock mounting plate 1 is an L-shaped plate with the electromagnetic lock 2 mounted on its vertical surface. The horizontal surface is fixed to the slide rails 7 by screws 23, and a through hole 20 is provided on the horizontal surface to accommodate the lock rod 15. An elongated opening 16 is provided at the front midline of the interlocking slide 3.

[0043] The elongated sliding hole 12 and the elongated opening 16 are both racetrack-shaped holes.

[0044] The rear end of the interlocking slide 3 is provided with a folded edge and a first spring hole is provided on the folded edge. The rear end of the horizontal surface of the electromagnetic lock mounting plate 1 is provided with a folded edge and a second spring hole is provided on the folded edge. The first spring hole and the second spring hole are coaxial. The two ends of the reset spring 4 are respectively connected to the first spring hole and the second spring hole. The reset spring 4 is in a stretched state.

[0045] The cable room door assembly 8 and door panel guide rails 9 are mounted below the compartment partition 5. The lock plate 11 is fixed to the top surface of the door panel 10. The lock plate 11 is a bent plate member, with its top surface serving as a contact surface 21 for contacting the electromagnetic lock rod 15, and its rear end serving as a push surface 22 for pushing the interlock lever 6. The cable room door panel 10 is slidably mounted on a pair of door panel guide rails 9, located on the left and right sides of the cable room door. A tooth 18 is provided on the back of the door panel 10, and a tooth hole 19 is provided on the door panel guide rails 9 for engaging the tooth 18. When the door panel 10 moves upward, the tooth 18 disengages from the tooth hole 19, allowing the door panel 10 to move forward and open. When the electromagnetic lock 2 is locked and the lock rod 15 is extended, the lock rod 15 can just support the top surface of the lock plate 11.

[0046] The electromagnetic lock rod 15 and interlock lever 6 extend out of the mechanism chamber 17 through the compartment partition 5, cooperating with the cable compartment door assembly 8 to lock and unlock. When the inlet and outlet bushings of the cable compartment 14 are energized, the electromagnetic lock rod 15 extends and presses against the door panel assembly, preventing the door panel from lifting upward. The door panel's hanging teeth are blocked by the door panel guide rails, preventing the cable compartment door from opening. When the cable chamber 14 inlet and outlet conduits are de-energized, the electromagnetic lock 2 is unlocked and the locking rod 15 retracts upward to above the compartment partition 5, freeing up space for the door panel assembly to move upward. The door panel 10 is lifted, and the tooth 18 on the door panel 10 is disengaged from the tooth hole 19 on the door panel guide rail 9, allowing the cable chamber door to be opened. At this time, the interlocking slide 3 moves toward the front of the cabinet under the action of the return spring 4, blocking the extension and retraction direction of the electromagnetic lock rod 15 (the blockage can be removed by closing the cable chamber door). If the cable conduit is energized again, the electromagnetic lock 2 cannot be locked due to the obstruction of the locking rod 15, triggering the reverse locking function. At this time, the electromagnetic lock buzzer alarm indicates that the locking has failed and warns the operator: 1) The cable chamber door panel is not closed or not closed fully; 2) The high-voltage live parts in the cable chamber are now energized and must not be touched. After correcting the incorrect operation, the buzzer alarm must be manually released.

[0047] The elongated sliding hole on the compartment partition 5 is a runway-shaped hole, the length of which is slightly larger than the stroke of the interlocking lever 6 moving forward and backward; the avoidance hole 13 on the compartment partition 5 is coaxial with the locking rod 15 and has a diameter larger than the outer diameter of the locking rod 15; double screw holes are provided on the compartment partition 5 for fixing the slide guide 7 and the electromagnetic lock mounting plate 1; a folding edge is provided at the front end of the compartment partition 5, and the screw hole is positioned with the folding edge of the partition, and two parallel slide guides 7 are installed on the left and right, with the middle distance slightly wider than the interlocking slide 3, and the slide guide 7 is slightly thicker than the interlocking slide 3 to prevent the interlocking slide 3 from getting stuck when sliding back and forth.

[0048] Wings 24 are provided on either side of the rear of the interlocking slide 3. These wings 24 engage the rear end of the slide rail 7 to limit the forward travel of the interlocking slide 3. Positioning holes are provided at the midline of the wings of the interlocking slide 3. The lower surface of the interlocking slide 3 and the interlocking lever 6 are positioned and press-fitted together through the positioning holes.

[0049] The working process of the present invention is as follows:

[0050] 1. Door closed and locked state: When the cable room door panel is hung on the door panel guide rail, the lock plate at the upper end of the door panel overcomes the pulling force of the reset spring to push the interlocking lever backward, driving the interlocking slide to move toward the mechanism room side. The long opening on the interlocking slide is aligned with the avoidance hole on the compartment partition to remove the obstruction of the locking rod. At this time, if the cable room inlet and outlet bushings are energized, the electromagnetic lock is locked, the locking rod is extended, and it presses against the lock plate at the upper end of the cable room door panel. There is no space for the cable room door panel to be lifted up. The hanging teeth on the cable room door panel are restricted by the door panel guide rail, and the cable room door panel cannot be opened, completing the locking. Figure 5 .

[0051] 2. Door closed and unlocked: The cable room door panel is hung on the door panel guide rail, and the avoidance hole on the interlocking slide and the compartment partition is aligned with the axis of the lock rod. At this time, if the cable room inlet and outlet bushings are not energized, the electromagnetic lock is unlocked, and the lock rod is retracted to a distance above the interlocking slide, releasing the restriction on the lock plate at the upper end of the cable room door panel, making room for the cable room door to be lifted. When the cable room door is lifted, the hanging teeth will no longer be restricted by the door panel guide rail, and the cable room door can be opened safely. Figure 6 .

[0052] 3. Reverse Lockout Warning: With the cable compartment door open, the interlock lever, driven by the return spring, moves the interlock slide toward the front of the cabinet. Restricted by the butterfly wings at the rear of the interlock slide, it stops in a designated position. The elongated opening on the interlock slide is now misaligned with the electromagnetic lock rod and offset, obscuring the clearance hole in the compartment partition. If the cable compartment inlet and outlet bushings are live, the interlock slide will obstruct the electromagnetic lock, placing it somewhere between "locked" and "unlocked," preventing it from locking and triggering the reverse lockout warning. The electromagnetic lock will then sound a buzzer, indicating a lockout failure and alerting the operator: 1) The cable compartment door is not closed or not fully closed; 2) High-voltage live parts in the cable compartment are live and should not be touched. After correcting the incorrect operation, manually deactivate the buzzer.

[0053] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A cabinet door interlocking device with reverse locking, characterized in that: The lock assembly comprises a compartment partition, a slidable interlocking slide mounted on the upper surface of the compartment partition, a pair of parallel slide rails fixed on the upper surface of the compartment partition and placed on both sides of the interlocking slide, an electromagnetic lock mounting plate fixed on the upper surface of the slide rails, an electromagnetic lock and a reset spring with a warning function arranged on the electromagnetic lock mounting plate, the electromagnetic lock mounting plate is located above the interlocking slide, one end of the reset spring is connected to the interlocking slide, and the other end is connected to the electromagnetic lock mounting plate, an interlocking lever for cooperating with the upper lock plate of the cable room door plate is provided on the lower surface of the interlocking slide, an elongated sliding hole extending along the sliding direction of the interlocking slide and an avoidance hole for the extension and retraction of the electromagnetic lock rod are provided on the compartment partition, and the interlocking lever passes downward through The elongated sliding hole can slide along the elongated sliding hole to drive the interlocking slide plate to move back and forth. When the cable room door is open or not closed in place, the interlocking slide plate slides to the slide plate guide rail limit position under the action of the reset spring to block the avoidance hole, and when the cable room inlet and outlet bushings are energized, the electromagnetic lock cannot be locked and is in a reverse locking warning state; when the cable room door is closed in place, the cable room door overcomes the pulling force of the reset spring to push the interlocking slide plate backward to expose the avoidance hole. When the cable room inlet and outlet bushings are energized, the electromagnetic lock rod extends out of the avoidance hole and touches the lock plate and is in an electromagnetic lock locked state. At this time, the cable room door cannot be opened. When the cable room inlet and outlet bushings are not energized, the electromagnetic lock rod retracts from the avoidance hole and is in an electromagnetic lock unlocked state, and the cable room door can be opened.

2. The cabinet door interlocking device with reverse locking according to claim 1, characterized in that: The width between the pair of skateboard guide rails is greater than the width of the interlocking skateboard, which constrains the interlocking skateboard from moving forward and backward in a straight line; the thickness of the skateboard guide rails is greater than the thickness of the interlocking skateboard, and the electromagnetic lock mounting plate is an L-shaped plate, an electromagnetic lock is installed on its vertical surface, and the horizontal surface is fixed on the skateboard guide rails, and a through hole adapted to the locking rod is provided on the horizontal plate surface.

3. The cabinet door interlocking device with reverse locking according to claim 2, characterized in that: The front end of the compartment partition is provided with a folding edge for positioning the slide rail and the electromagnetic lock mounting plate.

4. The cabinet door interlocking device with reverse locking according to claim 3, characterized in that: Wings are provided on both sides of the rear portion of the interlocking slide, and the wings can be engaged with the rear end of the slide guide rail to limit the forward movement of the interlocking slide.

5. The cabinet door interlocking device with reverse locking according to claim 4, characterized in that: A positioning hole is provided at the midline position of the wing of the interlocking slide. The lower plate surface of the interlocking slide and the interlocking lever are positioned and pressed into one through the positioning hole. A long opening is provided at the midline position of the front part of the interlocking slide.

6. The cabinet door interlocking device with reverse locking according to claim 5, characterized in that: The rear end of the interlocking slide is provided with a folded edge and a first spring hanging hole is provided on the folded edge. The rear end of the horizontal surface of the electromagnetic lock mounting plate is provided with a folded edge and a second spring hanging hole is provided on the folded edge. The two ends of the reset spring are respectively connected to the first spring hanging hole and the second spring hanging hole.

7. The cabinet door interlocking device with reverse locking according to claim 6, characterized in that: The interlocking slide, the electromagnetic lock mounting plate, the electromagnetic lock, the return spring and the slide guide rail are all installed in an independently arranged mechanism room.

8. The cabinet door interlocking device with reverse locking according to claim 7, characterized in that: The lock plate is a bent plate, the top surface of which is the contact surface against the locking rod of the electromagnetic lock, and the rear end surface of which is the pushing surface for pushing the interlocking lever.

9. The cabinet door interlocking device with reverse locking according to claim 8, characterized in that: The cable room door panel can be slidably installed on a pair of door panel guide rails arranged on the left and right sides of the cable room door. The lock plate is fixed on the top surface of the door panel, and a hanging tooth is provided on the back of the door panel. The door panel guide rail is provided with a hanging tooth hole for the hanging tooth to engage.

10. The cabinet door interlocking device with reverse locking according to claim 9, characterized in that: The early warning function of the electromagnetic lock is triggered when the lock rod is in the non-locking position / unlocking position and emits a long buzzer warning sound, and the manual reset interrupts the buzzer warning.

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