Mechanical interlocking device and switchgear

Abstract

The utility model belongs to the technical field of switch equipment, and discloses a mechanical interlocking device and switch equipment. The switch equipment comprises at least two parallel low-voltage electrical appliances, the mechanical interlocking device is located between the two low-voltage electrical appliances, the two low-voltage electrical appliances are both in an off state at the beginning, and when the low-voltage electrical appliance on one side is closed, a pushing piece in the low-voltage electrical appliance on the side drives an interlocking piece to swing through a boss of the pushing piece. The first surface of the boss on the closing side abuts against the antenna on one side of the interlocking piece, and the antenna on the other side of the interlocking piece abuts against the second surface of the boss of the pushing piece in the low-voltage electric appliance on the opening side, so that the pushing piece on the opening side is effectively prevented from rotating towards the closing state, and the low-voltage electric appliance on the opening side is kept in the opening state. Through a simple rotation interlocking mechanism, reliable interlocking between two parallel low-voltage electric appliances is realized, the structure of the mechanical interlocking device is simplified, the production cost is saved, and the safety and the reliability of the switch equipment are obviously improved.

Description

Technical Field

[0001] This utility model relates to the field of switchgear technology, and in particular to mechanical interlocking devices and switchgear. Background Technology

[0002] Mechanical interlocking devices are widely used in electrical control systems, especially in multiple low-voltage electrical appliances (such as circuit breakers and contactors) arranged in parallel, to prevent safety hazards such as short circuits and overloads caused by malfunctions or simultaneous closure.

[0003] In existing technologies, common mechanical interlocking devices typically use levers, sliders, or gears as interlocking components to achieve interlocking functions between adjacent switching devices. These common mechanical interlocking devices have relatively complex structures and numerous components, resulting in high manufacturing costs and large installation space requirements, which is not conducive to the application of compact electrical equipment. Secondly, the movement of existing interlocking components is mostly linear sliding, with limited movement paths, making it difficult to adapt to switching devices driven by certain angles or rotations.

[0004] Therefore, there is an urgent need for a mechanical interlocking device and switching equipment to solve the above problems. Utility Model Content

[0005] The purpose of this utility model is to provide a mechanical interlocking device that simplifies the structure of the mechanical interlocking device, saves production costs, and significantly improves the safety and reliability of switchgear.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A mechanical interlocking device, used in switchgear, the switchgear comprising at least two low-voltage electrical appliances in parallel, including:

[0008] An interlocking component includes a rotating shaft and two contact points located on both sides of the rotating shaft, the rotating shaft being rotatably disposed between the two low-voltage electrical appliances;

[0009] A pusher is provided on each side of the interlocking member, and each pusher is rotatably disposed in the low-voltage electrical appliance corresponding to it. The pusher is provided with a boss, and the boss includes a first surface and a second surface arranged at an angle.

[0010] When the low-voltage electrical appliance on one side of the interlocking member is closed and the low-voltage electrical appliance on the other side is open, the interlocking member swings about the axis of the rotating shaft, one of the two antennae abuts against the first surface of the boss on the closed side, and the other of the two antennae abuts against the second surface of the boss on the open side, so as to prevent the pusher of the low-voltage electrical appliance on the open side from rotating to the closed state.

[0011] Optionally, the interlocking element further includes:

[0012] A connecting plate, wherein the rotating shaft is located at one end of the connecting plate and is perpendicular to the connecting plate;

[0013] The crescent-shaped plate is disposed at the other end of the connecting plate and is on the same plane as the connecting plate. The two ends of the crescent-shaped plate respectively form the antennae.

[0014] Optionally, each of the tentacles has a third surface on its sidewall and a fourth surface on its bottom wall. The third surface can abut against the first surface of its corresponding protrusion, and the fourth surface can abut against the second surface of its corresponding protrusion.

[0015] Optionally, the width of the connecting plate gradually increases along the direction from the pivot to the crescent plate.

[0016] Optionally, the rotating shaft, the connecting plate, and the crescent plate are constructed as an integral structure, or the rotating shaft, the connecting plate, and the crescent plate are constructed as a spliced ​​structure.

[0017] Optionally, a reinforcing rib is provided at the connection between the connecting plate and the rotating shaft.

[0018] Optionally, the pusher includes a pusher body and two support arms, the two support arms being disposed opposite to each other on the pusher body, and each support arm having a boss on its outer side.

[0019] The purpose of this invention is to provide a switching device that saves production costs and significantly improves the safety and reliability of the switching device.

[0020] To achieve this objective, the present invention adopts the following technical solution:

[0021] A switching device comprising at least two low-voltage electrical appliances arranged in parallel and the aforementioned mechanical interlocking device, wherein the mechanical interlocking device is located between the two low-voltage electrical appliances and allows only one of the two low-voltage electrical appliances to be in a closed state.

[0022] Optionally, each of the low-voltage electrical appliances includes a housing, one of the two housings arranged side by side is provided with a first semi-circular groove and a first clearance hole, and the other of the two housings arranged side by side is provided with a second semi-circular groove and a second clearance hole. The first semi-circular groove and the second semi-circular groove surround to form a cylindrical groove. The rotating shaft is rotatably disposed in the cylindrical groove, and the two prongs of the interlocking member are respectively provided through the first clearance hole and the second clearance hole.

[0023] Optionally, the switching device further includes a fixing component for fixing two parallel low-voltage electrical appliances in a fixed connection.

[0024] Beneficial effects:

[0025] The mechanical interlocking device provided by this utility model initially has two parallel low-voltage electrical appliances in the open state. When one low-voltage electrical appliance is closed, the pusher inside that low-voltage electrical appliance drives the interlocking component to swing through its boss. The first surface of the boss on the closed side abuts against the contact point on one side of the interlocking component, and the contact point on the other side of the interlocking component abuts against the second surface of the boss of the pusher inside the open low-voltage electrical appliance. This effectively prevents the pusher on the open side from rotating to the closed state, thus keeping the low-voltage electrical appliance on the open side in the open state. Through a simple rotational interlocking mechanism, reliable interlocking between two parallel low-voltage electrical appliances is achieved, simplifying the structure of the mechanical interlocking device, saving production costs, and significantly improving the safety and reliability of the switchgear.

[0026] The switchgear provided by this utility model includes at least two parallel low-voltage electrical appliances with the same or similar structures. A mechanical interlocking device is installed between the two parallel low-voltage electrical appliances. When one of the two low-voltage electrical appliances is closed, the mechanical interlocking device locks the other low-voltage electrical appliance in the open state, preventing safety hazards such as short circuits and overloads caused by malfunctions or simultaneous closure, thereby improving the safety and reliability of the switchgear. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the switching device provided by this utility model;

[0028] Figure 2 This is an exploded view of the switchgear provided by this utility model;

[0029] Figure 3 This is a bottom view of the interlocking and pushing structure of the switchgear provided by this utility model when the low-voltage electrical appliance on the left is closed and the low-voltage electrical appliance on the right is opened;

[0030] Figure 4 This is a front view of the interlocking and pushing structure of the switchgear provided by this utility model when the low-voltage electrical appliance on the left is closed and the low-voltage electrical appliance on the right is opened;

[0031] Figure 5 yes Figure 4 A magnified view of a section at point A in the middle;

[0032] Figure 6 Is the switchgear in Figure 4 A side view of the local structure in the current state;

[0033] Figure 7 This is a structural schematic diagram of the interlocking component provided by this utility model;

[0034] Figure 8 This is a schematic diagram of the structure of the pusher provided by this utility model.

[0035] In the picture:

[0036] 100. Interlocking component; 110. Rotating shaft; 120. Connecting plate; 130. Crescent plate; 131. Antennae; 1311. Third surface; 1312. Fourth surface; 140. Reinforcing rib;

[0037] 200. Pushing component; 210. Pushing component body; 220. Support arm; 221. Boss; 2211. First surface; 2212. Second surface;

[0038] 300. Low-voltage electrical appliance; 310. Housing; 311. First semi-circular groove; 312. First clearance hole; 313. Fixing lug; 314. Fixing groove;

[0039] 400. Fixing components; 410. Fasteners. Detailed Implementation

[0040] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0041] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to 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 utility model based on the specific circumstances.

[0042] In this invention, unless otherwise explicitly 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 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 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.

[0043] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0044] This embodiment provides a mechanical interlocking device and a switching device, such as Figures 1-5 As shown, the switchgear includes at least two parallel low-voltage electrical appliances 300 with the same or similar structures. A mechanical interlocking device is installed between the two parallel low-voltage electrical appliances 300. When one of the two low-voltage electrical appliances 300 is closed, the mechanical interlocking device locks the other low-voltage electrical appliance 300 in the open state, preventing safety hazards such as short circuits and overloads caused by malfunctions or simultaneous closure, thereby improving the safety and reliability of the switchgear.

[0045] The phrase "two low-voltage electrical appliances 300 with identical structures" means that the two housings 310 and their internal structures are completely identical. The phrase "two low-voltage electrical appliances 300 with similar structures" means that the housings 310 and the internal electromagnet mechanisms are identical. Components other than the housings 310 and the electromagnet mechanisms can differ, thus ensuring that the mechanical interlocking device interlocks the two parallel low-voltage electrical appliances 300. Specifically, the two low-voltage electrical appliances 300 can both be contactors, both be circuit breakers, or a combination of contactors and circuit breakers.

[0046] The following section will introduce the specific details of the mechanical interlocking device, taking the example of a mechanical interlocking device installed between two parallel low-voltage electrical appliances 300 with similar structures.

[0047] Optionally, such as Figure 2 and Figure 3As shown, the mechanical interlocking device includes an interlocking component 100 and two pushing components 200. Each low-voltage electrical appliance 300 includes a housing 310 and an electromagnet mechanism. The electromagnet mechanism is disposed within the housing 310. Each low-voltage electrical appliance 300 contains a pushing component 200, which can be driven by its corresponding electromagnet structure to swing, thereby achieving the closing and opening of the low-voltage electrical appliance 300. One of the two parallel housings 310 is provided with a first semi-circular groove 311 and a first clearance hole 312, while the other of the two parallel housings 310 is provided with a second semi-circular groove and a second clearance hole. The first semi-circular groove 311 and the second semi-circular groove form a cylindrical groove. A rotating shaft 110 is rotatably disposed within the cylindrical groove. The two prongs 131 of the interlocking component 100 pass through the first clearance hole 312 and the second clearance hole, respectively, so that the two prongs 131 contact the two pushing components 200 to form an interlocking structure, thereby improving the safety of the switching equipment.

[0048] Optionally, the cylindrical groove is formed by the enclosing of the first semicircular groove 311 and the second semicircular groove (not shown), which effectively restricts the radial movement of the rotating shaft 110, ensuring that the interlocking member 100 can only swing stably around the axis of the rotating shaft 110, thereby improving the action accuracy and reliability of the interlocking member 100. At the same time, the first semicircular groove 311 and the second semicircular groove are respectively provided on the two housings 310, which simplifies the processing difficulty of a single housing 310 and reduces the manufacturing cost.

[0049] Optionally, the first clearance hole 312 and the second clearance hole (not shown) provide ample space for the movement of the interlocking member 100's antenna 131, allowing the two antennas 131 of the interlocking member 100 to precisely abut against the first surface 2211 of the closed-side boss 221 and the second surface 2212 of the open-side boss 221, respectively. This structure not only ensures effective cooperation between the interlocking member 100 and the pusher 200, but also reduces frictional loss between the antenna 131 and the housing 310, extending the service life of the device. Furthermore, the mechanical interlocking device utilizes the gap between the parallel low-voltage electrical appliances 300, eliminating the need for additional installation space and significantly improving the space utilization of the switchgear, making it particularly suitable for compact electrical systems, such as small distribution boxes or control cabinets.

[0050] Optionally, such as Figure 1 and Figure 2 As shown, the switchgear also includes a fixing component 400, which is used to fix two parallel low-voltage electrical appliances 300 together. The fixing component 400 ensures a stable connection between the two adjacent low-voltage electrical appliances 300, thereby providing a reliable foundation for the normal operation of the mechanical interlocking device, ensuring precise cooperation between the interlocking component 100 and the pushing component 200, and improving the reliability of the interlocking function.

[0051] Specifically, the fixing component 400 includes a fastener 410. One of the two adjacent housings 310 is provided with a fixing lug 313, which has a first mounting hole. The other of the two adjacent housings 310 is provided with a fixing groove 314, which has a second mounting hole at its bottom. When the two low-voltage electrical appliances 300 are arranged side by side, the fixing lug 313 is inserted into the fixing groove 314, with the first and second mounting holes corresponding to each other. The fastener 410 passes through the first and second mounting holes in sequence and is threadedly connected to the housing 310 to fix the two housings 310 together. In this embodiment, the upper and lower parts of the two housings 310 are connected together by the fixing component 400, which improves the overall structural strength and stability of the switchgear, thereby extending its service life. In this embodiment, the fastener 410 is a fastening screw.

[0052] In other embodiments, the two housings 310 of two parallel low-voltage electrical appliances 300 can be snap-fit ​​connected, that is, one of the two housings 310 is provided with a buckle, and the other of the two housings 310 is provided with a slot, and the buckle snaps into the slot to realize the quick connection of the two housings 310.

[0053] like Figures 4-8 As shown, the interlocking component 100 includes a rotating shaft 110 and two contact points 131 located on both sides of the rotating shaft 110. The rotating shaft 110 is rotatably disposed between two low-voltage electrical appliances 300. A pusher 200 is provided on each side of the interlocking component 100, and each pusher 200 is rotatably disposed within its corresponding low-voltage electrical appliance 300. The pusher 200 has a boss 221, which includes a first surface 2211 and a second surface 2212 arranged at an angle. In this embodiment, the angle between the first surface 2211 and the second surface 2212 is 90°. Initially, both low-voltage electrical appliances 300 are in an open state, such as... Figures 4-6 As shown, when one low-voltage electrical appliance 300 is closed, the pusher 200 inside the low-voltage electrical appliance 300 drives the interlocking member 100 to swing through its boss 221. The first surface 2211 of the boss 221 on the closed side abuts against the antenna 131 on one side of the interlocking member 100, and the antenna 131 on the other side of the interlocking member 100 abuts against the second surface 2212 of the boss 221 of the pusher 200 inside the low-voltage electrical appliance 300 on the open side. This effectively prevents the pusher 200 on the open side from rotating to the closed state, thereby keeping the low-voltage electrical appliance 300 on the open side in the open state. Through a simple rotational interlocking mechanism, reliable interlocking between two parallel low-voltage electrical appliances 300 is achieved, simplifying the structure of the mechanical interlocking device, saving production costs, and significantly improving the safety and reliability of the circuit.

[0054] In other embodiments, the included angle between the first surface 2211 and the second surface 2212 can be any value between 60° and 90°, specifically 60°, 65°, 70°, 75°, 80°, 85°, 90°, etc. In this embodiment, the included angle between the first surface 2211 and the second surface 2212 is preferably 90°, which ensures that the first surface 2211 of the boss 221 on the closed side provides a stable thrust when driving the interlocking member 100 to swing. At the same time, the second surface 2212 of the boss 221 on the disconnected side forms a perpendicular blocking structure with the disconnected side contact angle 131, maximizing the mechanical blocking effect and significantly improving the reliability of the interlock and the safety of the circuit.

[0055] Optionally, such as Figure 7 As shown, the interlocking component 100 also includes a connecting plate 120 and a crescent plate 130. The rotating shaft 110 is located at one end of the connecting plate 120 and is perpendicular to the connecting plate 120. The crescent plate 130 is disposed at the other end of the connecting plate 120 and is in the same plane as the connecting plate 120. The two ends of the crescent plate 130 respectively form antennas 131. The crescent plate 130 is coplanar with the connecting plate 120 and the two ends of the crescent plate 130 respectively form antennas 131, which simplifies the manufacturing process of the interlocking component 100, reduces processing steps and material costs, and at the same time ensures the strength and precision of the fit between the antennas 131 and the boss 221, which has high economic efficiency and production efficiency.

[0056] Furthermore, the connecting plate 120 is perpendicularly connected to the rotating shaft 110 and extends through the crescent plate 130 to form an antenna 131, constituting a highly efficient lever structure. During operation, when one side of the low-voltage electrical appliance 300 is closed, the boss 221 of the closing-side pusher 200 acts on the antenna 131, driving the interlocking member 100 to swing around the rotating shaft 110 through the lever action of the connecting plate 120, causing the other side antenna 131 to contact the boss 221 on the disconnected side, thereby achieving reliable interlocking. This design enhances the sensitivity and stability of the interlocking action, ensuring that the disconnected low-voltage electrical appliance 300 is effectively locked in the disconnected state.

[0057] Optionally, each tentacle 131 has a third surface 1311 on its sidewall and a fourth surface 1312 on its bottom wall. The third surface 1311 abuts against the first surface 2211 of its corresponding boss 221, and the fourth surface 1312 abuts against the second surface 2212 of its corresponding boss 221. Initially, the low-voltage electrical appliances 300 on both sides of the interlocking member 100 are in the open state. Then, the low-voltage electrical appliance 300 on the left side of the interlocking member 100 closes (at this time, the left side of the interlocking member 100 is called the closed side, such as...). Figures 4-5As shown, the low-voltage electrical appliance 300 on the right side of the interlocking member 100 is in the open state (referred to as the open side). During the closing process of the low-voltage electrical appliance 300 on the closed side, the electromagnet mechanism inside the low-voltage electrical appliance 300 on the closed side attracts the corresponding pusher 200 to flip upward. The first surface 2211 of the boss 221 of the pusher 200 contacts the third surface 1311 of the left side of the interlocking member 100, driving the interlocking member 100 to swing to the right. The fourth surface 1312 of the right side of the interlocking member 100 then abuts against the second surface 2212 of the boss 221 of the pusher 200 on the open side, forming an effective mechanical block, ensuring that the low-voltage electrical appliance 300 on the open side is firmly locked in the open state, thus enhancing the stability and reliability of the interlocking action.

[0058] Optionally, such as Figure 7 As shown, along the direction from the rotating shaft 110 to the crescent plate 130, the width of the connecting plate 120 gradually increases, which enhances the overall rigidity and torsional resistance of the interlocking component 100, thereby enabling the stress-bearing area near the crescent plate 130 to withstand greater mechanical stress, thus improving the stability of the swing of the interlocking component 100 and ensuring the reliable realization of the interlocking function.

[0059] Optionally, such as Figure 7 As shown, the rotating shaft 110, connecting plate 120 and crescent plate 130 are constructed as an integral structure, which improves the overall rigidity and deformation resistance of the interlocking component 100, ensures the stability of the interlocking action, and simplifies the manufacturing process of the interlocking component 100, reducing production costs.

[0060] In other embodiments, the rotating shaft 110, connecting plate 120, and crescent plate 130 are constructed as a splicing structure, which facilitates the adjustment of component specifications according to the size or installation requirements of different low-voltage electrical appliances 300, enhances the adaptability of the interlocking component 100, is suitable for various switch equipment configurations, and facilitates the individual replacement of damaged components, thereby reducing maintenance costs and downtime.

[0061] Optionally, such as Figure 7 As shown, a reinforcing rib 140 is provided at the connection between the connecting plate 120 and the rotating shaft 110. The reinforcing rib 140 significantly enhances the mechanical strength of the connection between the connecting plate 120 and the rotating shaft 110, effectively preventing the connection from breaking or deforming due to stress concentration, and ensuring the long-term reliability of the interlocking function.

[0062] Optionally, such as Figure 8As shown, the pusher 200 includes a pusher body 210 and two support arms 220, which are disposed opposite to each other on the pusher body 210. Each support arm 220 has a boss 221 on its outer side. In actual assembly, the two parallel low-voltage electrical appliances 300 may correspond to different circuits, such as the main circuit and the backup circuit, and the positions of the two low-voltage electrical appliances 300 relative to the interlocking component 100 may need to be swapped depending on specific requirements. The symmetrical design of the two support arms 220 of the pusher 200 allows the corresponding low-voltage electrical appliances 300 to adapt to any installation position, significantly improving installation flexibility and compatibility, simplifying the production and assembly process, and reducing the adaptation costs increased due to position adjustments.

[0063] Optionally, the first semicircular groove 311 and the second semicircular groove symmetrically arranged on both sides of the housing 310 ensure that when two adjacent low-voltage electrical appliances 300 are assembled side by side, regardless of their position relative to the interlocking member 100 (e.g., left or right), the two semicircular grooves can together form a complete cylindrical groove to support the rotation of the shaft 110 of the interlocking member 100. Simultaneously, the first clearance hole 312 and the second clearance hole communicate with the first semicircular groove 311 and the second semicircular groove respectively, providing a pathway for the swinging of the interlocking member 100's contact 131. This symmetrical structure ensures that regardless of changes in the installation sequence or orientation of the low-voltage electrical appliances 300, the interlocking member 100 can achieve precise engagement with the pusher 200, thereby completing a reliable interlocking function and significantly improving the installation flexibility and adaptability of the device.

[0064] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A mechanical interlocking device, applied in a switchgear, said switchgear comprising at least two low-voltage electrical appliances (300) arranged in parallel, characterized in that, include: The interlocking component (100) includes a rotating shaft (110) and two antennae (131) located on both sides of the rotating shaft (110), the rotating shaft (110) being rotatably disposed between the two low-voltage electrical appliances (300); A pusher (200) is provided on each side of the interlocking member (100), and each pusher (200) is rotatably disposed in the low-voltage electrical appliance (300) corresponding to it. The pusher (200) is provided with a boss (221), and the boss (221) includes a first surface (2211) and a second surface (2212) arranged at an angle. When the low-voltage electrical appliance (300) on one side of the interlocking member (100) is closed and the low-voltage electrical appliance (300) on the other side is open, the interlocking member (100) swings about the axis of the rotating shaft (110), one of the two tentacles (131) abuts against the first surface (2211) of the boss (221) on the closed side, and the other of the two tentacles (131) abuts against the second surface (2212) of the boss (221) on the open side, so as to prevent the pusher (200) of the low-voltage electrical appliance (300) on the open side from rotating to the closed state.

2. The mechanical interlocking device according to claim 1, characterized in that, The interlocking element (100) further includes: A connecting plate (120) is provided, and the rotating shaft (110) is located at one end of the connecting plate (120) and perpendicular to the connecting plate (120). The crescent plate (130) is disposed at the other end of the connecting plate (120) and is on the same plane as the connecting plate (120). The two ends of the crescent plate (130) respectively form the antennae (131).

3. The mechanical interlocking device according to claim 2, characterized in that, Each of the tentacles (131) has a third surface (1311) on its sidewall and a fourth surface (1312) on its bottom wall. The third surface (1311) can abut against the first surface (2211) of its corresponding boss (221), and the fourth surface (1312) can abut against the second surface (2212) of its corresponding boss (221).

4. The mechanical interlocking device according to claim 2, characterized in that, Along the direction from the pivot (110) to the crescent plate (130), the width of the connecting plate (120) gradually increases.

5. The mechanical interlocking device according to claim 2, characterized in that, The rotating shaft (110), the connecting plate (120), and the crescent plate (130) are constructed as an integral structure, or the rotating shaft (110), the connecting plate (120), and the crescent plate (130) are constructed as a spliced ​​structure.

6. The mechanical interlocking device according to claim 2, characterized in that, The connection between the connecting plate (120) and the rotating shaft (110) is provided with a reinforcing rib (140).

7. The mechanical interlocking device according to any one of claims 1-6, characterized in that, The pusher (200) includes a pusher body (210) and two support arms (220). The two support arms (220) are disposed opposite to each other on the pusher body (210), and each support arm (220) has a boss (221) on its outer side.

8. A switchgear, characterized in that, It includes at least two low-voltage electrical appliances (300) arranged side by side and a mechanical interlocking device as described in any one of claims 1-7, the mechanical interlocking device being located between the two low-voltage electrical appliances (300) and the mechanical interlocking device allowing only one of the two low-voltage electrical appliances (300) to be in a closed state.

9. The switching device according to claim 8, characterized in that, Each of the low-voltage electrical appliances (300) includes a housing (310). One of the two housings (310) arranged side by side is provided with a first semi-circular groove (311) and a first clearance hole (312). The other of the two housings (310) arranged side by side is provided with a second semi-circular groove and a second clearance hole. The first semi-circular groove (311) and the second semi-circular groove surround to form a cylindrical groove. The rotating shaft (110) is rotatably disposed in the cylindrical groove. The two tentacles (131) of the interlocking member (100) pass through the first clearance hole (312) and the second clearance hole, respectively.

10. The switching device according to claim 9, characterized in that, The switching device further includes a fixing component (400) for fixing two parallel low-voltage electrical appliances (300) together.

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