Low-voltage switch cabinet with five-prevention interlocking protection structure

Abstract

The utility model discloses a low -voltage switchgear with five -prevention interlock protection structure, including switch cabinet body, the interlock mechanism is equipped in the cabinet door one end, when the cabinet door is closed and is locked, the interlock mechanism locking end extension top touch connection board back with reset function always -off type travel contact point, and the contact point is connected through the high -temperature -resistant insulating wire the signal relay terminal strip in the cabinet, and the terminal strip branch connection ground switch control module, intermediate relay and the state indicating lamp outside the cabinet door, the utility model constructs " mechanical locking + electrical interlock + state feedback " trinity protection system, promotes switch cabinet operation safety, operation reliability and operation convenience.

Description

Technical Field

[0001] This utility model relates to the field of power distribution switchgear technology, specifically a low-voltage switchgear with a five-proof interlocking protection structure. Background Technology

[0002] Low-voltage switchgear is the core equipment for power distribution and control, and its operational safety is directly related to the stable operation of the power network and the personal safety of maintenance personnel. Currently, although traditional low-voltage switchgear is equipped with basic interlocking devices, it generally suffers from three major problems: First, mechanical interlocking is disconnected from electrical control, relying solely on mechanical locks to restrict cabinet door opening without linking the cabinet door status with the operating permissions of grounding switches and circuit breakers, easily leading to accidents such as "closing the switch with grounding on" or "closing the grounding switch while energized"; second, status feedback is not intuitive, lacking devices that directly display whether the interlocking is effective, requiring maintenance personnel to disassemble and inspect or use specialized tools, making pre-operation judgment difficult; third, the protection against misoperation is limited, relying only on physical limits of the mechanical structure without dual protection at the circuit level.

[0003] The auxiliary interlocking device for the switchgear with announcement number CN222320019U, although adding active locking to the traditional "five-proof" system, still relies primarily on mechanical interlocking—it only restricts the rotation of the grounding switch interlocking shaft through a linkage structure, without linking the switchgear door opening / closing status with the electrical control circuits of the grounding switch and circuit breaker. When mechanical components (such as linkages and interlocking shafts) wear or become stuck, the interlocking function is prone to failure, failing to cut off the erroneous operation path at the circuit level, and still posing a risk of "accidental closing after mechanical interlocking failure." Furthermore, the device lacks a status feedback mechanism; if the linkage does not accurately extend into the limit hole, maintenance personnel may not notice it in time, further increasing the difficulty of pre-operation checks. Utility Model Content

[0004] The purpose of this utility model is to provide a low-voltage switchgear with a five-proof interlocking protection structure to solve the technical problem of interlocking failure caused by wear or jamming of mechanical parts in existing interlocking devices.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A low-voltage switchgear with a five-proof interlocking protection structure includes a switchgear body. An interlocking mechanism is fixedly installed at one end of the cabinet door of the switchgear body. When the interlocking mechanism closes and locks with the cabinet door, its locking end extends to touch the contact point provided on the back of the connecting plate. The contact point is a normally open travel contact with a reset function and is electrically connected to the signal transfer terminal block provided inside the switchgear body through a high-temperature resistant insulated wire.

[0007] As a preferred embodiment of this utility model, the signal transfer terminal block is connected to the coil terminals of the grounding switch control module and the intermediate relay respectively through branch wires; the grounding switch control module and the intermediate relay are both fixedly installed inside the switch cabinet body.

[0008] As a preferred embodiment of this utility model, the contact point transmits the locking signal to the grounding switch control circuit through a high-temperature resistant insulated wire; the other path transmits the signal synchronously back to the circuit breaker operating circuit through the contact switching of an intermediate relay, forming a dual signal linkage.

[0009] As a preferred embodiment of this utility model, the signal transfer terminal block is also connected to the status indicator light via a branch wire; the status indicator light is fixed to the outside of the cabinet door of the switch cabinet body.

[0010] As a preferred embodiment of this utility model, the interlocking mechanism includes a lock plate, which is fixedly installed at one end of the cabinet door of the switch cabinet body; the lock tongue of the lock plate contacts the L-shaped plate during the twisting locking process; the L-shaped plate is slidably installed at one end of the back of the lock plate, and a connecting column is fixedly installed at one end of the lock plate; two sets of L-shaped contact plates are rotatably installed on the outer surface of the connecting column, and one end of the bent part of the two sets of L-shaped contact plates is rotatably installed on the lock plate; the L-shaped plate drives the two sets of L-shaped contact plates to flip synchronously through the connecting column, and the flipped L-shaped contact plates make damped sliding contact with the contact points on the connecting plate.

[0011] As a further preferred embodiment of this utility model, the other end of the L-shaped plate is fixedly connected to the spring; the other end of the spring is fixedly connected to the top pressure plate; the top pressure plate is fixedly installed at one end of the locking plate, and the spring applies an elastic pushing force to the L-shaped plate.

[0012] Compared with the prior art, the beneficial effects of this utility model of a low-voltage switchgear with a five-proof interlocking protection structure are:

[0013] When the interlocking mechanism closes and locks with the cabinet door, its locking end extends to contact the contact point on the back of the connecting plate. Combined with the contact point's characteristic of being a "normally open travel contact with reset function," it ensures that the electrical signal is triggered only when the cabinet door is fully closed and locked in place. This avoids false signals when the cabinet door is not closed, not locked, or not locked in place, achieving precise linkage between the mechanical locking action and the electrical signal triggering, and providing a reliable signal source for subsequent interlocking control.

[0014] The contact point is electrically connected to the signal transfer terminal block inside the switch cabinet body through a high-temperature resistant insulated wire. The high-temperature resistant insulated wire can withstand the high-temperature environment that may occur inside the switch cabinet body, while avoiding the risk of wire leakage, ensuring that the lock signal is stable and safe during transmission, not interfered with by environmental factors, and ensuring the reliability of signal transmission. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only examples of embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0017] Figure 2 This is a schematic diagram of the status indicator light and grounding switch control module in an embodiment of this utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the L-shaped plate and the L-shaped contact plate in the embodiment of this utility model;

[0019] Figure 4 This is a schematic diagram of the structure of the spring and the top pressure plate in the embodiment of this utility model.

[0020] Reference numerals in the attached diagram: 1. Switchgear body; 101. Status indicator light; 102. Grounding switch control module; 103. Connecting plate; 104. Contact point; 105. Intermediate relay; 2. Interlocking mechanism; 201. Locking plate; 202. Locking tongue; 203. L-shaped plate; 204. Connecting column; 205. L-shaped contact plate; 206. Top pressure plate; 207. Spring. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.

[0022] In the description of the embodiments of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of the present invention 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 the embodiments of the present invention.

[0023] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an integral connection, or a detachable connection; they can refer to the internal connection of two components; they can refer to a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present invention should be understood according to the specific circumstances.

[0024] See Figures 1-4 As shown in the figure, a low-voltage switchgear with a five-proof interlocking protection structure is provided in this embodiment of the present invention. It includes a switchgear body 1, and an interlocking mechanism 2 is fixedly installed at one end of the cabinet door of the switchgear body 1. When the interlocking mechanism 2 closes and locks with the cabinet door, its locking end extends to touch the contact point 104 provided on the back of the connecting plate 103. The contact point 104 is a normally open travel contact with a reset function, and is electrically connected to the signal transfer terminal block provided inside the switchgear body 1 through a high-temperature resistant insulated wire.

[0025] When the interlocking mechanism 2 closes and locks with the cabinet door, its locking end extends to contact point 104 on the back of the connecting plate 103. Combined with the characteristic of contact point 104 as a "normally open travel contact with reset function", it can ensure that the electrical signal is triggered only when the cabinet door is fully closed and locked in place, avoiding false signals when the cabinet door is not closed, not locked, or not locked in place. This achieves precise linkage between mechanical locking action and electrical signal triggering, providing a reliable signal source for subsequent interlocking control.

[0026] Contact point 104 is electrically connected to the signal transfer terminal block inside the switch cabinet body 1 via a high-temperature resistant insulated wire. The high-temperature resistant insulated wire can withstand the high-temperature environment that may occur inside the switch cabinet body 1, while avoiding the risk of wire leakage, ensuring that the lock signal is stable and safe during transmission, not interfered with by environmental factors, and ensuring the reliability of signal transmission.

[0027] The signal transfer terminal block is connected to the coil terminals of the grounding switch control module 102 and the intermediate relay 105 respectively through branch wires; the grounding switch control module 102 and the intermediate relay 105 are both fixedly installed inside the switch cabinet body 1.

[0028] The signal transfer terminal block is connected to the coil terminals of the grounding switch control module 102 and the intermediate relay 105 respectively through branch wires to realize the "branch distribution" of the lockout signal. This allows the grounding switch control module 102 and the intermediate relay 105 to receive the lockout signal synchronously, providing a hardware connection basis for subsequent two independent interlocking control and avoiding the functional limitations caused by only transmitting a single signal.

[0029] The grounding switch control module 102 and the intermediate relay 105 are both fixedly installed inside the switch cabinet body 1, which can ensure that the installation position of both is stable and avoid the components from loosening or shifting due to equipment operation vibration or external force contact, thereby preventing signal reception interruption or action failure, ensuring the stable operation of subsequent interlocking functions, and improving the reliability of the overall structure.

[0030] Contact point 104 transmits the lock signal to the grounding switch control circuit via a high-temperature resistant insulated wire; another path transmits the signal synchronously back to the circuit breaker operating circuit via the contact switching of intermediate relay 105, forming a dual signal linkage.

[0031] The locking signal of contact point 104 is transmitted to the grounding switch control circuit, which can directly control the operation authority of the grounding switch. This can prevent the grounding switch from being operated erroneously when the cabinet door is unlocked (no locking signal), such as closing the grounding switch while it is energized, thus cutting off the erroneous operation path of the grounding switch at the circuit level.

[0032] Another signal is fed back to the circuit breaker operating circuit through the contact switching of intermediate relay 105, which can restrict the operating authority of the circuit breaker and prevent the circuit breaker from being accidentally closed when the cabinet door is not locked, forming a dual signal linkage of "grounding switch control + circuit breaker operation control"; even if one signal path fails (such as poor wire contact or single module failure), the other path can still work normally, cutting off the corresponding erroneous operation path, which greatly improves the reliability of erroneous operation protection and solves the problem of easy failure of traditional mechanical interlocking.

[0033] The signal transfer terminal block is also connected to the status indicator light 101 via branch wires; the status indicator light 101 is fixed to the outside of the cabinet door of the switch cabinet body 1.

[0034] The signal conversion terminal block is connected to the status indicator light 101 via branch wires, and the status indicator light 101 is fixed on the outside of the cabinet door of the switch cabinet body 1. It can convert the lock signal into an intuitive light signal. Maintenance personnel do not need to open the cabinet door, disassemble the equipment or use professional tools to check. They can quickly determine whether the interlock is effective by simply looking at the status indicator light 101 on the outside of the cabinet door (e.g., the specified color light is lit when the lock is normal, and the light is off or a warning light is lit when the lock is not locked). This solves the problem of traditional switch cabinets lacking intuitive status feedback and being difficult to check, and improves the convenience of operation and maintenance.

[0035] The intuitive feedback function of the status indicator light 101 allows maintenance personnel to quickly confirm the interlock status before operation, avoiding misoperation due to inability to determine whether the interlock is effective, and further improving operational safety.

[0036] The interlocking mechanism 2 includes a lock plate 201, which is fixedly installed at one end of the cabinet door of the switch cabinet body 1. The locking tongue 202 of the lock plate 201 contacts the L-shaped plate 203 during the twisting locking process. The L-shaped plate 203 is slidably installed at one end of the back of the lock plate 201, and a connecting post 204 is fixedly installed at one end of the lock plate 201. Two sets of L-shaped contact plates 205 are rotatably installed on the outer surface of the connecting post 204, and one end of the bent part of the two sets of L-shaped contact plates 205 is rotatably installed on the lock plate 201. The L-shaped plate 203 drives the two sets of L-shaped contact plates 205 to flip synchronously through the connecting post 204. After flipping, the L-shaped contact plates 205 make damped sliding contact with the contact point 104 on the connecting plate 103.

[0037] When the latch 202 on the lock plate 201 twists to lock, it touches the L-shaped plate 203. The L-shaped plate 203 slides and drives the connecting post 204, which in turn causes the two sets of L-shaped contact plates 205 to flip synchronously. This achieves the mechanical linkage of "latch 202 action → L-shaped plate 203 sliding → connecting post 204 linkage → L-shaped contact plate 205 flipping", ensuring that while the cabinet door is mechanically locked, the L-shaped contact plate 205 can accurately flip to contact the contact point 104 on the connecting plate 103, ensuring the accuracy of signal triggering.

[0038] Two sets of L-shaped contact plates 205 are mounted on the outer surface of the connecting post 204 in a relative rotational manner, forming a "redundant triggering structure": even if one set of L-shaped contact plates 205 is worn, stuck or has poor contact, the other set can still contact the contact point 104 to ensure normal transmission of the locking signal, avoid signal interruption due to a single contact plate failure, and improve the reliability of signal triggering.

[0039] The damped sliding contact between the L-shaped contact plate 205 and the contact point 104 can eliminate the mechanical gap between them, ensure a tight contact, and avoid signal transmission instability caused by gaps. At the same time, the damped contact can reduce the hard collision between the L-shaped contact plate 205 and the contact point 104, reduce wear on both, and extend the service life of the components.

[0040] After the L-shaped touch plate 205 is flipped over, it is inserted into the back of the connecting plate 103. Based on the mechanical locking of the lock tongue 202, it can further enhance the locking effect of the cabinet door, make the cabinet door close more securely, avoid the cabinet door from loosening and causing the interlock to fail, and improve the reliability of the mechanical locking.

[0041] The other end of the L-shaped plate 203 is fixedly connected to the spring 207; the other end of the spring 207 is fixedly connected to the top pressure plate 206; the top pressure plate 206 is fixedly installed on one end of the lock plate 201, and the spring 207 applies an elastic pushing force to the L-shaped plate 203. The L-shaped plate 203 is always in close contact with the lock tongue 202, so that when the lock tongue 202 twists and touches, the L-shaped plate 203 cannot slide in time due to the gap, thus ensuring the timeliness and reliability of the mechanical linkage between the lock tongue 202 and the L-shaped plate 203.

[0042] The elastic pushing force of spring 207 can buffer the impact force on L-shaped plate 203 when the locking tongue 202 is twisted, reduce the mechanical wear of locking tongue 202 and L-shaped plate 203, extend their service life, and reduce the frequency of component replacement.

[0043] When the L-shaped plate 203 drives the L-shaped contact plate 205 to contact the contact point 104, the elastic pushing force of the spring 207 can keep the L-shaped contact plate 205 maintaining a stable pressure on the contact point 104, further ensuring the tightness of the damped sliding contact, avoiding the separation of the L-shaped contact plate 205 from the contact point 104 due to equipment vibration or minor deformation of components, and ensuring continuous and stable signal transmission.

[0044] This utility model embodiment revolves around "mechanical action triggering electrical signals, electrical signal linkage interlocking control and status feedback", and the specific process is as follows:

[0045] 1. Mechanical linkage trigger signal: When the cabinet door is closed, the locking tongue 202 on the twist lock plate 201 is locked. The locking tongue 202 touches the L-shaped plate 203 that is slidably installed on the back of the lock plate 201, causing the L-shaped plate 203 to move towards the top pressure plate 206. When the L-shaped plate 203 moves, it drives the connecting post 204 fixed on the lock plate 201, which in turn drives the two sets of L-shaped contact plates 205 to flip around the bend (because the two sets of L-shaped contact plates 205 are installed on the outer surface of the connecting post 204 with relative rotation). Finally, the flipped L-shaped contact plates 205 form a damped sliding contact with the contact point 104 on the back of the connecting plate 103, triggering an electrical signal.

[0046] 2. Signal splitting and interlocking control: When contact 104 (normally open travel contact) is triggered, it changes from open to closed, transmitting the interlocking signal to the signal transfer terminal block inside switchgear body 1 via a high-temperature insulated wire; the signal transfer terminal block splits the signal into three paths:

[0047] 2.1 The first path to the coil terminal of the grounding switch control module 102 controls the grounding switch control circuit—the grounding switch can only operate normally when a lock signal is received; otherwise, the operation permission is cut off.

[0048] 2.2 The second path leads to the coil terminal of intermediate relay 105. After intermediate relay 105 operates, it feeds back the signal to the circuit breaker operating circuit through contact switching. The circuit breaker can only be closed / opened normally when an interlocking signal is received, forming a double electrical interlock.

[0049] 2.3 The third channel connects to the status indicator 101, causing the status indicator 101 to light up in the corresponding color (such as green light), providing intuitive feedback that the interlock is in effect.

[0050] 3. Elastic compensation ensures reliability: When the L-shaped plate 203 moves, it compresses the spring 207 (one end of the spring 207 is connected to the L-shaped plate 203, and the other end is connected to the top pressure plate 206 fixed on the lock plate 201). The elastic pushing force of the spring 207 ensures that the L-shaped plate 203 and the lock tongue 202 are always in close contact, avoiding mechanical gaps that could lead to linkage failure. On the other hand, it allows the L-shaped contact plate 205 to continuously apply pressure to the contact point 104, ensuring tight damping contact and preventing signal transmission interruption.

[0051] How to use:

[0052] 1. Cabinet door closing operation: Push the cabinet door of switch cabinet body 1 towards the cabinet body until the cabinet door is completely flush with the cabinet body (ensure the cabinet door is closed in place to avoid subsequent interlock failure due to incomplete closure).

[0053] 2. Mechanical locking of cabinet door: Use a key or operating tool to turn the latch 202 on the lock plate 201. During the turning process, you should feel the resistance of the latch 202 touching the L-shaped plate 203 (indicating that the mechanical linkage has been activated). Continue to turn until the latch 202 is completely locked (at this time, the cabinet door cannot be opened and the mechanical locking is completed).

[0054] 3. Interlock status confirmation: Observe the status indicator light 101 on the outside of the switch cabinet body 1. If the indicator light is lit in the preset "normal interlock" color (such as green light), it means that the contact point 104 has triggered the signal, the grounding switch control module 102 and the intermediate relay 105 have been linked, and the interlock system has taken effect. If the indicator light is not lit or is lit in the "abnormal" color (such as red light), it is necessary to check whether the cabinet door is closed in place and whether the locking tongue 202 is fully locked (if necessary, rotate the locking tongue 202 again to ensure that the L-shaped contact plate 205 is in contact with the contact point 104).

[0055] 4. Subsequent equipment operation: After confirming that the status indicator 101 is normal, the grounding switch or circuit breaker can be operated according to the procedure. At this time, the grounding switch control module 102 and the intermediate relay 105 will allow normal operation according to the lock signal. If the status of the indicator light is not confirmed or the indicator light is abnormal, it is strictly forbidden to operate the grounding switch or circuit breaker to avoid accidents caused by misoperation.

[0056] 5. Cabinet door unlocking operation: When the cabinet door needs to be opened, first stop the operation of the grounding switch and circuit breaker, then use a key or tool to turn the locking tongue 202 in the reverse direction. After the locking tongue 202 is reset, the L-shaped plate 203 will rebound under the elastic pushing force of the spring 207, causing the L-shaped contact plate 205 to separate from the contact point 104 (the contact point 104 is reset and disconnected, and the status indicator light 101 is turned off or changes color). Finally, the cabinet door can be opened.

[0057] In summary, this utility model embodiment comprehensively solves the shortcomings of traditional switchgear through a three-in-one structure of "mechanical locking + electrical interlocking + status feedback". The specific technical effects are as follows:

[0058] 1. Significantly improved reliability of mechanical locking:

[0059] In interlocking mechanism 2, when the locking tongue 202 is twisted to lock, it causes the L-shaped plate 203 to slide, and then the two sets of L-shaped contact plates 205 are flipped through the connecting column 204. The two sets of L-shaped contact plates 205 form a "redundant triggering structure". Even if one set cannot contact the contact point 104 due to wear or jamming, the other set can still trigger the signal normally, avoiding the interlock failure caused by the failure of a single mechanical component. At the same time, after the L-shaped contact plate 205 is flipped, it is inserted into the back of the connecting plate 103, which further strengthens the cabinet door fixation on the basis of the mechanical locking of the locking tongue 202, and prevents the cabinet door from loosening and destroying the interlocking state.

[0060] Spring 207 applies an elastic pushing force to L-shaped plate 203, which on the one hand ensures that L-shaped plate 203 is always in close contact with latch 202, eliminating mechanical gaps and ensuring the timely linkage of "latch 202-L-shaped plate 203-L-shaped contact plate 205"; on the other hand, it buffers the impact force when latch 202 is twisted, reduces the wear of latch 202 and L-shaped plate 203, and extends the service life of mechanical parts.

[0061] 2. Electrical interlocking safety is significantly enhanced:

[0062] Contact point 104 (a normally open travel contact with a reset function) only triggers a signal when the cabinet door is fully closed and locked. The signal is transmitted to the signal transfer terminal block via a high-temperature insulated wire, and then the grounding switch control module 102 and intermediate relay 105 are linked. The grounding switch control module 102 directly cuts off the path of "grounding switch misoperation when the cabinet door is not locked". The intermediate relay 105 restricts the circuit breaker's operating authority through contact switching, forming a dual electrical interlock of "grounding switch + circuit breaker". Even if one signal path (such as poor contact of the grounding switch control circuit wire) fails, the other path can still cut off the corresponding misoperation, solving the problem that traditional mechanical interlocking is prone to failure.

[0063] High-temperature resistant insulated wires can withstand the high-temperature environment inside the switch cabinet body 1, while avoiding the risk of leakage, ensuring stable and safe transmission of electrical signals, and preventing interference from environmental factors (such as high temperature and humidity).

[0064] 3. The convenience of status feedback has been fully optimized:

[0065] The signal conversion terminal block branch connection status indicator 101 (fixed on the outside of the switch cabinet body 1) can convert the lock signal and interlock status into intuitive light signals. Maintenance personnel do not need to open the cabinet door or disassemble the equipment. They can quickly determine whether the interlock is effective by observing the on / off state or color of the status indicator 101 (e.g., green light when locked, red light when unlocked). This greatly reduces the difficulty of pre-operation inspection and avoids misoperation due to inability to determine the interlock status.

[0066] 4. Improved overall operation and maintenance and adaptability:

[0067] All core components (grounding switch control module 102, intermediate relay 105, interlocking mechanism 2) are fixedly installed inside the switch cabinet body 1. The structure is compact and the installation is stable, preventing the components from shifting due to equipment vibration or external force. At the same time, each component is connected to the signal transfer terminal block through wires. During subsequent maintenance, the signal path can be quickly checked through the terminal block without the need for complete disassembly, thus improving operation and maintenance efficiency.

[0068] The foregoing has shown and described the basic principles of the present invention. The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. The above embodiments and descriptions in the specification are only illustrative of the principles of the present invention. Any modifications, equivalent substitutions, and improvements made within the scope of the present invention without departing from the scope of the present invention should be included within the protection scope of the present invention.

Claims

1. A low-voltage switchgear with a five-proof interlocking protection structure, characterized in that: The switch cabinet includes a switch cabinet body (1), and an interlocking mechanism (2) is fixedly installed at one end of the cabinet door of the switch cabinet body (1). When the interlocking mechanism (2) closes and locks with the cabinet door, its locking end extends to touch the contact point (104) provided on the back of the connecting plate (103). The contact point (104) is a normally open travel contact with a reset function, and is electrically connected to the signal transfer terminal block provided inside the switch cabinet body (1) through a high-temperature resistant insulated wire.

2. The low-voltage switchgear with a five-proof interlocking protection structure according to claim 1, characterized in that: The signal transfer terminal block is connected to the coil terminals of the grounding switch control module (102) and the intermediate relay (105) respectively through branch wires; the grounding switch control module (102) and the intermediate relay (105) are both fixedly installed inside the switch cabinet body (1).

3. The low-voltage switchgear with a five-proof interlocking protection structure according to claim 2, characterized in that: The contact point (104) transmits the lock signal to the grounding switch control circuit through a high-temperature resistant insulated wire; another path transmits the signal synchronously to the circuit breaker operation circuit through the contact switching of the intermediate relay (105), forming a dual signal linkage.

4. The low-voltage switchgear with a five-proof interlocking protection structure according to claim 1, characterized in that: The signal transfer terminal block is also connected to the status indicator (101) via a branch wire; the status indicator (101) is fixed to the outside of the cabinet door of the switch cabinet body (1).

5. The low-voltage switchgear with a five-proof interlocking protection structure according to claim 1, characterized in that: The interlocking mechanism (2) includes a lock plate (201), which is fixedly installed at one end of the cabinet door of the switch cabinet body (1); the lock tongue (202) of the lock plate (201) contacts the L-shaped plate (203) during the twisting locking process; the L-shaped plate (203) is slidably installed at one end of the back of the lock plate (201), and a connecting column (204) is fixedly installed at one end of the lock plate (201); two sets of L-shaped contact plates (205) are rotatably installed on the outer surface of the connecting column (204), and one end of the bent part of the two sets of L-shaped contact plates (205) is rotatably installed on the lock plate (201); the L-shaped plate (203) drives the two sets of L-shaped contact plates (205) to flip synchronously through the connecting column (204), and the flipped L-shaped contact plates (205) make damped sliding contact with the contact point (104) on the connecting plate (103).

6. The low-voltage switchgear with a five-proof interlocking protection structure according to claim 5, characterized in that: The other end of the L-shaped plate (203) is fixedly connected to the spring (207); the other end of the spring (207) is fixedly connected to the top pressure plate (206); the top pressure plate (206) is fixedly installed on one end of the lock plate (201), and the spring (207) applies an elastic pushing force to the L-shaped plate (203).

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