Interlocking device for low voltage switchgear

Abstract

The application provides an interlocking device for a low-voltage switch cabinet. The installation cabinet comprises a cabinet body and a cabinet door. The cabinet door is rotationally connected to the cabinet body. The inner side of the cabinet door is provided with a fixing seat. A door lock assembly is installed on the inner side of the cabinet door. The door lock assembly comprises a door lock and a self-locking mechanism. The rotating shaft of the door lock is rotationally connected to the cabinet door. The self-locking mechanism comprises a ratchet wheel, at least two sets of pawls and at least two sets of springs. The ratchet wheel is coaxially connected to the rotating shaft of the door lock. The at least two sets of pawls are engaged with the ratchet wheel. One side of the pawl is rotationally connected to the fixing seat through a connecting shaft. The at least two sets of springs are correspondingly arranged with the at least two sets of pawls. One end of the spring is connected to the pawl. The other end of the spring is connected to the fixing seat. A circuit breaker handle is installed on the cabinet door. An interlocking assembly is assembled on the inner side of the cabinet door. The interlocking assembly comprises a linkage and an unlocking mechanism. The two ends of the interlocking assembly are respectively connected to the circuit breaker handle and the self-locking mechanism. The application can guarantee the interlocking reliability of the circuit breaker and the cabinet door and ensure the safety of the equipment.

Description

Technical Field

[0001] This invention relates to the field of low-voltage switchgear technology, specifically to an interlocking device for low-voltage switchgear. Background Technology

[0002] In related technologies, interlocking devices for fixed low-voltage switchgear are used in power supply systems such as large-scale power grid security and defense systems and intelligent dispatching systems. They mainly consist of a single-path cam and connecting rod forming a purely mechanical transmission body. They rely on the coaxial cam of the external circuit breaker handle to link the connecting rod and locking tongue to achieve interlocking with the cabinet door, preventing personnel from accidentally touching live parts when opening the cabinet door while the circuit breaker is closed, and avoiding electric shock accidents caused by personnel accidentally entering live compartments.

[0003] However, in practical engineering applications, the applicant discovered the following shortcomings in the relevant technology: In related technologies, a purely mechanical interlocking component is installed between the circuit breaker handle and the cabinet door. When the circuit breaker is closed, the cabinet door is locked to prevent it from being opened while energized. If the cabinet door is not closed in place, the circuit breaker is restricted from closing. However, the door lock is only a simple spring-limited self-locking mechanism. The spring is prone to fatigue due to long-term reciprocating force, resulting in reduced elasticity and loosening of the spring, which reduces the self-locking function of the door lock. In addition, there is no interlocking status indication, making it impossible to intuitively view the interlocking status inside the cabinet. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an interlocking device for low-voltage ring main units, thereby solving the problems mentioned in the background section.

[0005] To achieve the above objectives, the present invention provides the following technical solution: An interlocking device for a low-voltage switchgear includes: a mounting cabinet comprising a cabinet body and a cabinet door, the cabinet body having an operating port, the cabinet door being rotatably connected to the cabinet body to open and close the operating port, and a fixing seat being provided on the inner side of the cabinet door; a door lock assembly installed on the inner side of the cabinet door, the door lock assembly including a door lock and a self-locking mechanism, the rotating shaft of the door lock being rotatably connected to the cabinet door; the self-locking mechanism including a ratchet, at least two sets of pawls, and at least two sets of springs, the ratchet being coaxially connected to the rotating shaft of the door lock; the at least two sets of pawls being coaxially connected to the rotating shaft of the door lock; and the at least two sets of pawls being coaxially connected to the rotating shaft of the door lock. The ratchet wheels mesh, and one side of the pawl is rotatably connected to the fixed seat via a connecting shaft; at least two sets of springs are correspondingly arranged with at least two sets of pawls, one end of the spring is connected to the pawl, and the other end of the spring is connected to the fixed seat; a circuit breaker handle is installed on the cabinet door; an interlocking assembly is assembled on the inside of the cabinet door, the interlocking assembly includes a linkage component and an unlocking mechanism, the unlocking mechanism is connected to the circuit breaker handle via the linkage component, and the unlocking mechanism includes an unlocking rack, a first gear, a second gear, and a third gear, wherein: The unlocking rack is vertically slidably connected to the fixed base. The first gear, the second gear, and the third gear mesh and drive in sequence. The first gear meshes with the unlocking rack and is rotatably connected to the fixed base. The second gear is coaxially connected to the rotating shaft of the door lock and is located on the side of the ratchet opposite to the cabinet door. The third gear is correspondingly arranged with the pawl and is connected to the connecting shaft of the corresponding pawl.

[0006] In some implementations, the interlocking assembly further includes a swing rod and a connecting rod, wherein the linkage, swing rod, connecting rod, and unlocking rack are sequentially hinged and driven to transmit the rotational power of the circuit breaker handle to the unlocking mechanism.

[0007] In some implementations, a status indicator is provided on the unlocking rack, and a viewing window is provided on the cabinet door to display the status indicator.

[0008] In some implementations, a guide seat is also provided on the inner side of the cabinet door, and a through guide hole is provided in the guide seat along the width direction of the cabinet door; The bottom of the unlocking rack is provided with a first inclined surface; The interlocking assembly further includes a limiting mechanism, which comprises a fourth gear and a limiting rod, wherein: The fourth gear is coaxially connected to the rotating shaft of the door lock and is assembled on the side of the second gear facing away from the fixed base; The limiting rod slides through the guide hole of the guide seat. The top of the limiting rod is provided with a rack portion, which meshes with the second gear to form a gear and rack engagement. The limiting rod is provided with a second inclined surface, which can engage with the first inclined surface to allow the first inclined surface to slide along the inclined surface of the second inclined surface.

[0009] In some embodiments, one of the first inclined surface and the second inclined surface is provided with a guide protrusion, and the other is provided with a guide groove that slides with the guide protrusion.

[0010] In some implementations, the circuit breaker handle includes a knob, a square shaft, and a toggle component. The knob is exposed on the outside of the cabinet door. The knob is connected to one end of the square shaft via a linkage, and the other end of the square shaft is connected to the toggle component for driving the circuit breaker to perform opening and closing operations.

[0011] In some embodiments, the interlocking device further includes an electromagnet assembled inside the cabinet door to attract at least a portion of the interlocking assembly when the cabinet door is opened, thereby limiting the interlocking assembly.

[0012] In some implementations, the interlocking device further includes a limit switch assembled on the door sill of the cabinet, on the side opposite to the cabinet door hinge, and the electromagnet is electrically connected to the limit switch.

[0013] In some implementations, the door lock assembly further includes a lever and a lever rod. The door lock is assembled on a corresponding mounting hole on the cabinet door. The center of the lever is coaxially connected to the rotation shaft of the door lock. Two lever rods are configured and assembled opposite to each other on both sides of the lever along the width direction of the cabinet door. The lever is rotated to drive the lever rods to move up and down relative to each other along the height direction of the cabinet door.

[0014] In some embodiments, the mounting base is provided with a vertical groove, and at least a portion of the unlocking rack is slidably disposed in the groove.

[0015] The interlocking device for low-voltage switchgear provided in this application, when implemented, uses a self-locking structure consisting of a circuit breaker handle, a multi-gear and an unlocking rack, and a ratchet and pawl linkage to the door lock. This structure can stably achieve bidirectional mechanical interlocking between the circuit breaker handle and the cabinet door lock. The multi-stage gear and rack transmission effectively avoids the problems of inadequate locking and easy failure of traditional single-link locking. At the same time, the door lock relies on a ratchet, pawl, and spring combination to achieve reliable self-locking, which can resist vibration and human prying to bypass the interlocking. Furthermore, a limit mechanism is set at the corresponding position of the door lock. The rotation of the door lock's rotating shaft controls the limit mechanism to tighten, ensuring that the circuit breaker handle cannot be closed when the cabinet door is open, thus effectively eliminating safety hazards such as opening the door while it is energized or accidentally closing the circuit breaker. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the structure of an interlocking device for a low-voltage switchgear according to one or more embodiments of this application is shown; Figure 2 It shows Figure 1 A schematic diagram of the assembly of the cabinet door and door lock components; Figure 3 A schematic diagram of the structure assembled at the cabinet door is shown; Figure 4 It shows Figure 3 A structural diagram from another perspective; Figure 5 It shows Figure 2 An enlarged structural diagram of point B in the middle; Figure 6 It shows Figure 5 A schematic diagram of the self-locking mechanism in the diagram; Figure 7 It shows Figure 4 An enlarged structural diagram of point C in the middle; Figure 8 It shows Figure 7 A schematic diagram of the unlocking rack in the middle; Figure 9 It shows Figure 7 A schematic diagram of the limiting rod in the middle; Figure 10 It shows Figure 1 A magnified structural diagram of point A in the middle.

[0018] In the diagram: 100, mounting cabinet; 110, cabinet body; 120, cabinet door; 121, mounting base; 1211, slide rail; 122, mounting hole; 123, viewing window; 124, guide seat; 200. Door lock assembly; 210. Door lock; 220. Paddle; 230. Paddle lever; 240. Self-locking mechanism; 241. Ratchet; 242. Pad; 243. Spring; 300. Limit switch; 400. Electromagnet; 500. Circuit breaker handle; 510. Knob; 520. Square shaft; 530. Toggle component; 600. Interlocking assembly; 610. Linkage component; 620. Swing rod; 630. Connecting rod; 640. Unlocking mechanism; 641. Unlocking rack; 6411. Status indicator; 6412. First inclined convex surface; 642. First gear; 643. Second gear; 644. Third gear; 650. Limiting mechanism; 651. Fourth gear; 652. Limiting rod; 6521. Second inclined convex surface. Detailed Implementation

[0019] To enable those skilled in the art to more clearly understand this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0020] Figure 1 A schematic diagram of the structure of an interlocking device for a low-voltage switchgear according to one or more embodiments of this application is shown. Figure 2 It shows Figure 1 A schematic diagram of the assembly of the cabinet door and door lock components. Figure 3The diagram shows the structural assembly at the cabinet door. Figure 4 It shows Figure 3 Another perspective on the structural diagram, combined with Figures 1-4 The interlocking device for the low-voltage switchgear includes a mounting cabinet 100, a door lock assembly 200, a circuit breaker handle 500, and an interlocking assembly 600. The mounting cabinet 100 serves as the overall load-bearing foundation structure and is mainly composed of a cabinet body 110 and a cabinet door 120. An operating port is provided on the front side of the cabinet body 110, and the cabinet door 120 is rotatably connected to the cabinet body 110 to open and close the operating port. Specifically, the cabinet door 120 and the operating port of the cabinet body 110 are connected by multiple sets of hinges to achieve a rotating hinge engagement; the door lock assembly 200 is assembled on the inner side of the cabinet door 120 and is located on the side of the cabinet door 120 away from the hinge with the cabinet body 110, for self-locking and locking limit of the cabinet door 120; the circuit breaker handle 500 is assembled in the middle of the cabinet door 120, serving as the power input source of the interlocking device. While performing circuit breaker opening and closing operations, it drives the interlocking assembly 600 to unlock the self-locking mechanism 240 of the door lock assembly 200, allowing the door lock assembly 200 to be manually released from its locked state when the circuit breaker is opened, thus enabling the cabinet door 120 to open and close; the interlocking assembly 600 is integrally assembled in the inner area of ​​the cabinet door 120, connecting the circuit breaker handle 500 and the self-locking mechanism 240 of the door lock assembly 200. The specific details of the interlocking device for low-voltage switchgear provided in this application are now further described with reference to the accompanying drawings.

[0021] Combination Figures 1-3 In some embodiments, a fixing seat 121 is fixedly provided on the inner side of the cabinet door 120 corresponding to the installation position of the door lock assembly 200, providing stable installation support for the self-locking mechanism 240 and the unlocking mechanism 640 of the door lock. In addition, the cabinet door 120 is provided with mounting holes 122, viewing windows 123 and guide seats 124 respectively corresponding to the assembly positions. The mounting holes 122 are used to fix the circuit breaker handle 500, ensuring that the circuit breaker handle 500 can stably drive the circuit breaker opening and closing operations. The viewing window 123 is arranged at the corresponding position of the cabinet door 120 corresponding to the movement path of the sliding groove 1211 of the fixing seat 121 and the status indicator 6411, which can display the working status of the internal interlocking assembly 600 in real time and intuitively, providing a visual judgment basis for operation and maintenance inspection. The guide seat 124 is provided on the inner side of the cabinet door 120, on the side of the fixing seat 121 with the sliding groove. The guide seat 124 has a guide hole along the width of the cabinet door, which facilitates the sliding of the limit rod 652 mentioned below.

[0022] Figure 5 It shows Figure 2 The enlarged structural diagram at point B, combined with Figure 2 as well as Figure 5In some embodiments, the door lock assembly 200 is integrally assembled and fixed to the inner side of the cabinet door 120. It is the core execution structure for realizing the self-locking and locking limit of the cabinet door 120. The door lock assembly 200 includes a door lock 210, a lever 220, a lever rod 230, and a self-locking mechanism 240. The door lock 210 is assembled at the corresponding mounting hole 122 position of the cabinet door 120 to ensure that the rotation shaft of the door lock 210 can rotate freely without radial movement. The lever 220 adopts an elliptical plate structure design and is assembled on the inner side of the fixing base 121. The middle part of the lever 220 The position is fixedly connected coaxially with the rotation shaft of the door lock 210, so that the lever 220 can rotate synchronously with the rotation shaft of the door lock 210; two levers 230 are configured, and the two levers 230 are symmetrically arranged on both sides of the lever 220 along the width direction of the cabinet door 120, forming a symmetrical linkage structure. When the lever 220 rotates with the rotation shaft of the door lock, it can synchronously push the two levers 230 on both sides to achieve relative up and down displacement along the height direction of the cabinet door 120, thereby cooperating with the subsequent self-locking mechanism 240 to complete the locking and unlocking action.

[0023] Figure 6 It shows Figure 5 The structural diagram of the self-locking mechanism in the diagram, combined with Figure 5 as well as Figure 6 In some embodiments, the self-locking mechanism 240 serves as the core one-way locking structure of the door lock assembly 200. It is integrally mounted on the fixed base 121 and rotates coaxially with the rotating shaft of the door lock 210. The self-locking mechanism 240 includes a ratchet 241, at least two sets of pawls 242, and at least two sets of springs 243. The ratchet 241 is coaxially fixedly connected to the rotating shaft of the door lock 210 and is located on the outside of the fixed base 121, allowing it to rotate synchronously with the rotating shaft of the door lock 210 and the lever 220. At least two sets of pawls 242 are symmetrically arranged and mesh with the outer toothed structure of the ratchet 241, forming a two-way meshing limiting structure, effectively improving the locking stability of the ratchet 241. One side of the pawl 242 is hinged to the cabinet door 12 by bolts. On the fixed base 121 of 0, the other side of the pawl 242 is coaxially connected to the third gear 644 mentioned below, so that the pawl 242 can complete the swinging action synchronously with the rotation angle of the third gear 644, thereby accurately controlling the engagement and disengagement state with the ratchet 241, and realizing the controllable unlocking of the self-locking mechanism 240; at least two sets of springs 243 are matched with the pawl 242 one by one. One end of the spring 243 is connected to the body of the pawl 242, and the other end is connected to the fixed base 121. The spring 243 can continuously provide the pawl 242 with the reset preload force, ensuring that the pawl 242 always maintains the locked state of tightly engaging with the ratchet 241 when unlocked without external force, realizing the one-way stable self-locking of the door lock, and effectively resisting the problem of locking loosening caused by the wear of parts.

[0024] Combination Figure 3 as well as Figure 4 In some embodiments, the circuit breaker handle 500 includes a knob 510, a square shaft 520, and a toggle component 530. The knob 510 is exposed on the outside of the cabinet door 120, facilitating manual opening and closing operations by the operator from the outside of the cabinet door 120. The knob 510 forms a stable transmission connection with one end of the square shaft 520 through a linkage 610, and the other end of the square shaft 520 is connected to the toggle component. When the operator rotates the knob 510, the linkage 610 and the square shaft 520 rotate synchronously in sequence, stably transmitting the manual operation power to the interlocking assembly 600 and the toggle component 530. The toggle component 530 drives the circuit breaker to perform opening and closing operations. The interlocking assembly 600 drives the self-locking mechanism 240 of the door lock assembly 200 to unlock, thereby realizing the linkage between the circuit breaker operation and the door lock state, ensuring that the circuit breaker opening and closing operations can control the interlocking state of the cabinet door 120.

[0025] Combination Figure 4 In some embodiments, the interlocking device further includes an interlocking assembly 600, which includes a linkage 610, a swing rod 620, a connecting rod 630, and an unlocking mechanism 640. The linkage 610, the swing rod 620, the connecting rod 630, and the unlocking mechanism 640 are sequentially hinged end to end to form a continuous and stable power transmission link, which can transmit the rotational power of the circuit breaker handle 500 to the unlocking mechanism 640 step by step without loss, providing a stable power input to the unlocking mechanism 640.

[0026] Figure 7 It shows Figure 4 An enlarged structural diagram at point C, combined with... Figure 4 as well as Figure 7In some embodiments, the fixed base 121 has a sliding groove 1211 extending vertically along the cabinet door 120. The unlocking mechanism 640 includes an unlocking rack 641, a first gear 642, a second gear 643, and at least two third gears 644. The unlocking rack 641 meshes with the first gear 642, and the unlocking rack 641 is slidably mounted in the sliding groove 1211 of the fixed base 121. The sliding groove 1211 is used to precisely guide and limit the vertical displacement of the unlocking rack 641. The sliding groove 1211 forms a stable displacement limit and guiding constraint on the unlocking rack 641, so that the unlocking rack... 641 can only reciprocate in a straight line along the slide groove 1211, preventing the unlocking rack 641 from deflecting or turning during movement; the first gear 642 is rotatably connected to the fixed base 121; the second gear 643 is rotatably connected to the rotating shaft of the door lock 210; the third gear 644 is configured one-to-one with the pawl 242, and is assembled on the outside of the pawl 242 by bolts, and can drive the pawl 242 to rotate synchronously, realizing the unlocking of the self-locking mechanism 240; the first gear 642, the second gear 643, and the third gear 644 mesh in pairs in sequence to form a step-by-step stable transmission structure, ensuring the smoothness of the unlocking action.

[0027] Figure 8 It shows Figure 7 The structural diagram of the unlocking rack in the diagram, combined with Figure 7 as well as Figure 8 In some embodiments, the unlocking rack 641 is provided with a status indicator 6411, which corresponds to the position of the viewing window 123 on the cabinet door 120. When the unlocking rack 641 moves vertically along the slide groove 1211 under the drive of the connecting rod 630, it can simultaneously drive the status indicator 6411 to move up and down. The position of the status indicator 6411 can be observed through the viewing window 123, thereby helping the staff to accurately determine whether the interlocking component 600 is in a self-locking state or an unlocking state. The working condition can be judged without relying on electrical signal feedback at the construction site, effectively solving the problem of no visual indication in traditional interlocking devices, and greatly improving the convenience and accuracy of daily inspection, maintenance and repair of equipment. The bottom of the unlocking rack 641 is provided with a first inclined protrusion 6412, which can form an inclined surface cooperation with the second inclined protrusion 6521 described below to limit the unlocking rack 641 on the slide groove 1211.

[0028] Figure 9 It shows Figure 7 The structural diagram of the limiting rod in the middle, combined with Figure 7 as well as Figure 9In some embodiments, the interlocking device further includes a limiting component 650, which includes a fourth gear 651 and a limiting rod 652. The fourth gear 651 is coaxially fixedly connected to the rotation shaft of the door lock 210 and is located on the side of the second gear 643 facing away from the fixed seat 121. The limiting rod 652 is slidably inserted into the guide hole of the guide seat 124. The top part of the limiting rod 652 is provided with a rack structure to form a gear and rack meshing engagement with the fourth gear 651. A second inclined protrusion 6521 is provided on one side surface of the limiting rod 652 along the length direction. The second inclined protrusion 6521 forms an inclined engagement with the first inclined protrusion 6412, so that the first inclined protrusion can slide along the inclined surface of the second inclined protrusion.

[0029] When the circuit breaker handle 500 is in the closed position, the door lock 210 can perform a corresponding unlocking action. At this time, the rotating shaft of the door lock 210 will drive the fourth gear 651 to rotate, thereby driving the limiting member 652 to slide along the guide hole of the guide seat 124 along the width direction of the cabinet door 120. When the door lock 210 reaches the fully open state, the second inclined protrusion provided on the side of the limiting member 652 just forms an inclined surface engagement with the first inclined protrusion 6412 provided on the bottom of the unlocking rack 641, thereby resisting the vertical sliding of the unlocking rack 641 along the slide groove 1211, thus limiting the closed state of the circuit breaker handle 500 and ensuring that the cabinet door 120 is in the closed position. When the door is open and the door lock 210 is unlocked, the limit mechanism 650 limits the circuit breaker handle 500 to close. If maintenance personnel accidentally close the circuit breaker handle 500 while the cabinet door 120 is open, the reverse drive of the limit mechanism 650 will lock the door lock 210. The self-locking function of the self-locking mechanism 240 will be restored, so that the door lock 210 can only perform a one-way locking action. This ensures that the cabinet door 120 cannot be closed when it is open, reminding maintenance personnel that the circuit breaker handle 500 was accidentally closed while the cabinet door 120 is open, effectively avoiding the risk of electric shock caused by misoperation.

[0030] Combination Figure 4 In some embodiments, the interlocking device for the low-voltage switchgear also includes an electromagnet 400, which is mounted on the inside of the cabinet door 120 and within the area where the swing rod 620 is located when the circuit breaker handle 500 is turned to the closed position. The electromagnet 400 is used to magnetically attract the swing rod 620 and limit the swing rod 620.

[0031] Figure 10 It shows Figure 1 The enlarged structural diagram at point A in the middle, combined with Figure 4 as well as Figure 10In some embodiments, the interlocking device for the low-voltage switchgear also includes a limit switch 300, which is mounted on the door sill of the cabinet 110, on the side that is hinged to the cabinet door 120, and is used to monitor the signal that the cabinet door 120 is fully closed; the electromagnet 400 is electrically connected to the limit switch 300, and the limit switch 300 collects the signal that the cabinet door 120 is closed and controls the electromagnet 400 to be de-energized, so that the swing rod 620 is released from its limit. Electromagnet 400 and limit switch 300 are electrically connected and work together to form a linkage control logic. The specific working logic is as follows: When cabinet door 120 is not fully closed and limit switch 300 is not triggered, electromagnet 400 remains energized and attracted, and firmly attracts limit swing rod 620 through magnetic attraction, preventing swing rod 620 from swinging, thereby locking the transmission link of circuit breaker handle 500 and forcibly prohibiting circuit breaker closing operation; when cabinet door 120 is fully closed and limit switch 300 is normally triggered, the feedback signal of limit switch 300 controls electromagnet 400 to be de-energized and demagnetized, releasing the magnetic attraction limit effect on swing rod 620, and swing rod 620 returns to the swingable state, and circuit breaker handle 500 can then perform normal closing operation. At the same time, the electrical signals of the limit switch 300 and the electromagnet 400 are synchronously transmitted to the power grid intelligent dispatch system to monitor the opening and closing of the limit switch 300 and the power supply and disconnection of the electromagnet 400 at all times, effectively avoiding high-level safety accidents such as opening the door while it is energized, accidentally closing the switch, or accidentally entering an energized compartment.

[0032] It should be noted that both the limit switch 300 and the electromagnet 400 are powered by independent power supplies to prevent both from being de-energized when the switchgear is in the closed position, thus avoiding any impact on the interlocking mechanism. The limit switch 300 is assembled at the door lintel of the cabinet 110, opposite to the hinged side of the cabinet door 120. When the cabinet door 120 is fully closed, the edge of the cabinet door 120 precisely presses against the limit switch 300, triggering a closing signal and accurately capturing the signal indicating that the cabinet door 120 is fully closed. When the cabinet door 120 is not fully closed, partially closed, or misaligned, the limit switch 300 cannot be triggered normally and remains in the open state, preventing interlocking failure and potential hazards of improper closing caused by a half-closed cabinet door 120.

[0033] In summary, the interlocking device for low-voltage switchgear provided in this application is equipped with an electrically interlocking circuit consisting of a limit switch 300 powered by an independent power supply and an electromagnet 400. The on / off electrical signals generated by the two are synchronously and remotely transmitted to the power grid intelligent dispatching system, realizing remote online real-time monitoring of the opening and closing status of the cabinet door 120 and the locking status of the interlocking component 600. While ensuring that the circuit breaker handle 500 controls the circuit breaker opening and closing operations, the interlocking component 600 can simultaneously control the self-locking mechanism 240 of the door lock component 200 to release the one-way self-locking constraint on the door lock. At the same time, in conjunction with the limit mechanism, the mechanical structure realizes the forced interlocking of the circuit breaker opening and closing operations with the opening and closing of the cabinet door 120. This interlocking device forms a double electromechanical prohibition constraint on closing, completely preventing dangerous operations such as illegal closing when the cabinet door 120 is not closed and opening the cabinet door 120 when the circuit breaker is closed.

[0034] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0036] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0037] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0038] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. An interlocking device for a low-voltage switchgear, characterized in that: The interlocking device includes: The installation cabinet includes a cabinet body and a cabinet door. The cabinet body is provided with an operating port, and the cabinet door is rotatably connected to the cabinet body to open and close the operating port. A fixing seat is provided on the inner side of the cabinet door. A door lock assembly is installed inside the cabinet door. The door lock assembly includes a door lock and a self-locking mechanism. The rotating shaft of the door lock is rotatably connected to the cabinet door. The self-locking mechanism includes a ratchet, at least two sets of pawls, and at least two sets of springs. The ratchet is coaxially connected to the rotating shaft of the door lock. At least two sets of pawls engage with the ratchet, and one side of each pawl is rotatably connected to the fixed seat via a connecting shaft. At least two sets of springs are correspondingly arranged with at least two sets of pawls, with one end of each spring connected to a pawl and the other end connected to the fixed seat. The circuit breaker handle is installed on the cabinet door; An interlocking assembly is installed on the inside of the cabinet door. The interlocking assembly includes a linkage and an unlocking mechanism. The interlocking assembly is connected to the circuit breaker handle via the linkage. The unlocking mechanism includes an unlocking rack, a first gear, a second gear, and a third gear, wherein: The unlocking rack is vertically slidably connected to the fixed base. The first gear, the second gear, and the third gear mesh and drive in sequence. The first gear meshes with the unlocking rack and is rotatably connected to the fixed base. The second gear is coaxially connected to the rotating shaft of the door lock and is located on the side of the ratchet opposite to the cabinet door. The third gear is correspondingly arranged with the pawl and is connected to the connecting shaft of the corresponding pawl.

2. The interlocking device for a low-voltage switchgear according to claim 1, characterized in that: The interlocking assembly also includes a swing rod and a connecting rod. The linkage, swing rod, connecting rod, and unlocking rack are sequentially hinged and driven to transmit the rotational power of the circuit breaker handle to the unlocking mechanism.

3. The interlocking device for a low-voltage switchgear according to claim 1, characterized in that: The unlocking rack is equipped with a status indicator, and the cabinet door has a viewing window to display the status indicator.

4. The interlocking device for a low-voltage switchgear according to claim 1, characterized in that: The inner side of the cabinet door is also provided with a guide seat, and the guide seat has a through guide hole along the width direction of the cabinet door. The bottom of the unlocking rack is provided with a first inclined surface; The interlocking assembly further includes a limiting mechanism, which comprises a fourth gear and a limiting rod, wherein: The fourth gear is coaxially connected to the rotating shaft of the door lock and is assembled on the side of the second gear facing away from the fixed base; The limiting rod is slidably inserted through the guide hole of the guide seat. The top of the limiting rod is provided with a rack portion, which meshes with the second gear to form a gear-rack engagement. The limiting rod is provided with a second inclined surface, which can engage with the first inclined surface to allow the first inclined surface to slide along the inclined surface of the second inclined surface.

5. The interlocking device for a low-voltage switchgear according to claim 4, characterized in that: One of the first inclined surface and the second inclined surface is provided with a guide protrusion, and the other is provided with a guide groove that slides with the guide protrusion.

6. An interlocking device for a low-voltage switchgear according to any one of claims 1-5, characterized in that: The circuit breaker handle includes a knob, a square shaft, and a toggle component. The knob is exposed on the outside of the cabinet door. The knob is connected to one end of the square shaft via a linkage component. The other end of the square shaft is connected to the toggle component used to drive the circuit breaker to perform opening and closing operations.

7. An interlocking device for a low-voltage switchgear according to any one of claims 1-5, characterized in that: The interlocking device also includes an electromagnet, which is assembled on the inside of the cabinet door to attract at least a portion of the interlocking assembly when the cabinet door is opened, thereby limiting the interlocking assembly.

8. The interlocking device for a low-voltage switchgear according to claim 7, characterized in that: The interlocking device also includes a limit switch, which is assembled on the door sill of the cabinet, on the side opposite to the hinge of the cabinet door, and the electromagnet is electrically connected to the limit switch.

9. An interlocking device for a low-voltage switchgear according to any one of claims 1-5, characterized in that: The door lock assembly also includes a lever and a lever rod. The door lock is assembled on the corresponding mounting hole on the cabinet door. The middle part of the lever is coaxially connected to the rotation shaft of the door lock. The lever rod is configured as two rods, which are assembled opposite to each other on both sides of the lever along the width direction of the cabinet door. The lever is rotated to drive the lever rods to move up and down relative to each other along the height direction of the cabinet door.

10. An interlocking device for a low-voltage switchgear according to any one of claims 1-5, characterized in that: The mounting base has a vertical groove along its upper edge, and at least a portion of the unlocking rack is slidably disposed in the groove.

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