Interlocking mechanism for grounding switch and grounding switch

Abstract

This invention relates to the field of grounding switch technology, and particularly to an interlocking mechanism for a grounding switch and a grounding switch itself. The grounding switch includes a stationary contact base, a moving contact blade, and an interlocking mechanism. The interlocking mechanism includes two sets of opposing interlocking components, each comprising an interlocking base, an interlocking drive member, and an elastic limiting component. The interlocking base is mounted on the stationary contact base of the grounding switch. The interlocking drive member is rotatably mounted on the interlocking base and rotates under the push of the moving contact blade when the grounding switch is closed. The elastic limiting component is mounted on the interlocking base and abuts against at least one surface of the interlocking drive member to provide an elastic restoring force and a holding force in the closed state. This invention effectively solves the technical problems of existing linkage mechanisms using gear transmission for torque increase and self-locking, resulting in complex overall structure, difficult manufacturing and assembly, and inconvenient maintenance.

Description

Technical Field

[0001] This invention relates to the field of grounding switch technology, and in particular to an interlocking mechanism for grounding switches and a grounding switch. Background Technology

[0002] Grounding switches are critical safety devices in power systems. Their main functions include: reliably connecting equipment to the grounding terminal to form a clear grounding short-circuit point, ensuring the equipment is de-energized and guaranteeing maintenance safety; releasing residual charges in equipment or lines caused by capacitors, inductors, and other components after power outages; working with surge arresters to conduct overvoltages to the ground in the event of lightning strikes or operational overvoltages, protecting equipment insulation; and cooperating with disconnecting switches to enhance the safety of electrical compartments and prevent risks caused by misoperation or cross-energization.

[0003] When maintaining electrical equipment, grounding switches need to be operated for opening and closing. However, opening and closing grounding switches usually requires a large torque. If improper force is applied or the mechanism malfunctions during operation, the grounding switch can easily reverse and cause injury. Especially in high-voltage and ultra-high-voltage equipment, the operation process is highly dangerous, and improper operation by personnel can easily lead to safety accidents. In addition, traditional grounding switches generally have the following problems in actual operation: during the closing process, inertia can easily cause rebound, resulting in incomplete contact of the contacts; under the action of short-circuit current or electric repulsion, the contacts may retract or suffer severe burning; the large contact pressure set to meet the short-circuit current carrying capacity often leads to a shortened mechanical life, making it difficult to balance reliability and durability.

[0004] To address the aforementioned issues, patent document CN221057313U discloses a linkage mechanism for a grounding switch in electrical equipment. This mechanism includes a power input component and a torque amplifying component and a self-locking component connected to the power input component. The torque amplifying component increases the torque input from the power input component to the torque required for opening and closing the grounding switch, and then outputs it to the input shaft of the grounding switch. The self-locking component then locks the maintenance door of the electrical equipment. This linkage mechanism, by increasing the input torque through the torque amplifying component, effectively reduces the manual torque required for operation, lowers the operational difficulty of opening and closing the grounding switch, and improves operational safety to a certain extent.

[0005] However, the aforementioned linkage mechanism employs numerous gear transmission structures to achieve torque amplification and self-locking functions. While gear transmission enables precise torque conversion and self-locking positioning, the overall complexity of the mechanism increases significantly with the number of gears. On one hand, the machining and assembly of gears require high precision; the meshing, clearance control, and lubrication of multiple gears must be strictly guaranteed. This directly increases the manufacturing process difficulty and assembly complexity, making it difficult to improve production efficiency and yield. On the other hand, the maintenance of the gear system is also quite cumbersome during subsequent use of the equipment. Once wear or failure occurs, it requires professional personnel to disassemble, adjust, or even replace the gears, resulting in high maintenance costs, limited on-site operating space, and long repair cycles. Summary of the Invention

[0006] This invention provides an interlocking mechanism for a grounding switch to solve the technical problems in the prior art where the linkage mechanism uses gear transmission to achieve torque increase and self-locking, resulting in a complex overall structure, high manufacturing and assembly difficulty, and inconvenient maintenance; the purpose of this invention is also to provide a grounding switch.

[0007] To solve the above problems, the interlocking mechanism for grounding switches provided by the present invention adopts the following technical solution: An interlocking mechanism for a grounding switch includes two sets of interlocking components arranged opposite to each other. Each interlocking component includes an interlocking base, an interlocking drive, and an elastic limit component. The interlocking base is used to be installed on the stationary contact seat of the grounding switch; the interlocking drive is rotatably installed on the interlocking base, and rotates when the grounding switch is closed by the push of the moving contact knife; the elastic limiting component is installed on the interlocking base and abuts against at least one surface of the interlocking drive to provide elastic reset force and holding force in the closed state for the interlocking drive.

[0008] The beneficial effects of the interlocking mechanism for grounding switches provided by this invention are: First, a mechanical structure consisting of an interlocking base, an interlocking drive component, and an elastic limit assembly is adopted. The interlocking drive component is rotatably mounted on the interlocking base and is directly driven to rotate by the moving contact blade when the grounding switch is closed. This eliminates the need for torque conversion and motion transmission through multi-stage gears, thereby significantly reducing the number and types of parts. This fundamentally avoids the high-precision machining requirements, strict assembly clearance control, and complex lubrication needs caused by gear systems, significantly reducing the difficulty of manufacturing processes and assembly complexity.

[0009] Secondly, the elastic limit component directly abuts against the surface of the interlocking drive component, which can provide elastic reset force for the interlocking drive component during the closing process and form a reliable holding force after the closing is in place, realizing the self-locking function. The torque increasing, limit and self-locking functions are integrated into a few simple components, replacing the complex transmission chain required for gear self-locking, making the overall mechanism more concise and compact. It is not only easy to install in a limited space, but also effectively avoids subsequent maintenance problems such as gear wear and jamming. There is no need to disassemble the cumbersome transmission components during on-site maintenance, resulting in low maintenance costs and short cycles. It can also meet the requirements of existing equipment upgrades and renovations for structural adaptability and ease of operation.

[0010] In summary, the present invention effectively solves the technical problems of existing linkage mechanisms using gear transmission to achieve torque increase and self-locking, which leads to complex overall structure, high manufacturing and assembly difficulty, and inconvenient maintenance.

[0011] Furthermore, the elastic limiting component includes an upper spring plate and a lower spring plate, which respectively abut against different surfaces of the interlocking drive member.

[0012] Beneficial effects: By specifically setting the elastic limit component as an upper spring plate and a lower spring plate, which respectively abut against different surfaces of the interlocking drive component, bidirectional and functional elastic coordinated control of the interlocking drive component is realized.

[0013] Specifically, the lower spring plate maintains the interlocking drive component in its initial position with a small initial pressure, ensuring the stability of the interlocking drive component's posture before closing and providing accurate contact guidance for the moving contact knife. The upper spring plate, with a larger initial pressure, presses the interlocking drive component during the closing process, causing it to press against the moving contact knife from the side, forming effective friction braking and limit retention to prevent closing rebound. Moreover, during the closing process, the moving contact knife is easily affected by factors such as closing inertia, minor machining and assembly deviations, and slight deviations in its movement trajectory, making it prone to localized or skewed contact with the stationary contact seat. The directional pressing force of the upper spring plate provides flexible correction to the moving contact knife, pushing the contact reference surface of the moving contact knife to fit against the contact surface of the stationary contact seat, reducing the centering deviation of the contact contact from the root. At the same time, after the closing is in place, the upper spring plate continues to provide support force, allowing the interlocking drive component to maintain the pressing state on the moving contact knife even under the action of short-circuit current or electric repulsion, avoiding knife retraction. The upper and lower spring plates act on different surfaces of the interlocking drive component, with clear functions and no interference between them. This achieves both buffering and limiting during the closing process, and ensures reliable self-locking in the closed state. The overall structure is simple and the response is reliable, further enhancing the stability and adaptability of the interlocking device.

[0014] Furthermore, the interlocking base is provided with a first groove for accommodating the upper spring plate and a second groove for accommodating the lower spring plate.

[0015] Furthermore, the interlocking drive includes a base plate and a side plate. During the closing process, the moving contact blade contacts the base plate and pushes the interlocking drive to rotate. The side plate is used to press the moving contact blade after the interlocking drive rotates.

[0016] Beneficial Effects: By configuring the interlocking drive component into a structure including a base plate and side plates, during the closing process, the moving contact blade first contacts the base plate, pushing the interlocking drive component to rotate. The base plate, as the force-bearing surface, bears the impact load of the moving contact blade, converting the closing kinetic energy into the rotational kinetic energy of the interlocking drive component. As the interlocking drive component rotates, the side plates rotate accordingly and gradually press against the moving contact blade, forming mechanical limit and friction braking. This division of labor design, with the base plate triggering and the side plate pressing, allows the interlocking drive component to automatically switch its attitude according to the movement state of the moving contact blade at the moment of closing, without the need for additional transmission mechanisms or control components. During closing, the greater the pushing force of the moving contact blade on the base plate (i.e., the faster the closing speed and the stronger the inertia), the greater the pressing force of the side plate on the moving contact blade, achieving a reverse braking effect of greater inertia and tighter self-locking, effectively solving the technical problem of rebound during closing of traditional grounding switches.

[0017] Furthermore, the interlocking drive component includes a horizontal pressing section one, a connecting section, and a horizontal pressing section two. The horizontal pressing section one and the horizontal pressing section two are respectively connected to the lower end and the upper end of the connecting section. The horizontal pressing section one is rotatably mounted on the interlocking base, and the length of the horizontal pressing section one is greater than the length of the horizontal pressing section two.

[0018] Beneficial effects: By setting up an interlocking drive unit including a horizontal clamping section one, a connecting section, and a horizontal clamping section two, the horizontal clamping section one is relatively long and rotatably mounted on the interlocking base, forming an effective extension of the lever arm. This ensures that when the moving contact knife pushes the interlocking drive unit during the closing process, it can ensure that the moving contact knife contacts the horizontal clamping section one first, driving the horizontal clamping section one to rotate. At the same time, it can generate a large rotation angle and clamping stroke with a small input force, improving the sensitivity of the action response. Furthermore, by utilizing the lever principle, when the moving contact knife pushes the drive unit to rotate around the horizontal clamping section one, the clamping force of the horizontal clamping section two on the moving contact knife is effectively amplified. The clamping force can be increased without the need for an additional torque-increasing structure, enhancing the friction braking and limiting effect on the moving contact knife and better avoiding the problem of closing rebound.

[0019] Furthermore, a pressing boss is provided at one end of the horizontal pressing section opposite to the connecting section.

[0020] Beneficial effects: By setting a clamping boss at the end of the first horizontal clamping section, the clamping boss forms point contact or small-area contact with the moving contact blade after the interlocking drive component rotates, concentrating the clamping force on a specific area of ​​the moving contact blade, increasing the contact pressure, thereby effectively improving the friction braking effect and preventing the moving contact blade from displaced or rebounding due to vibration or electrodynamic force after closing. At the same time, the clamping boss can compensate for contact gaps caused by manufacturing tolerances or assembly deviations, ensuring that even with certain errors, the interlocking drive component can still form reliable contact with the moving contact blade, enhancing the fault tolerance and adaptability of the device.

[0021] Furthermore, the interlocking base is provided with an arc-extinguishing grid.

[0022] Beneficial effects: During the closing process of a grounding switch, when the moving contact approaches the stationary contact and reaches the breakdown distance, if there is residual voltage or short-circuit voltage in the system, an arcing phenomenon will occur between the moving and stationary contacts. At this time, the arc-extinguishing grid set on the upper part of the interlocking base can guide and elongate the arc, introducing the arc into the grid gap for cooling and segmentation, accelerating the extinguishing of the arc, thereby effectively reducing the erosion damage of the moving contact and stationary contact to the arc, protecting the surface quality of the contacts, and extending the electrical life of the switch.

[0023] To solve the above problems, the grounding switch provided by the present invention adopts the following technical solution: A grounding switch includes a stationary contact base and a moving contact blade, characterized in that it further includes an interlocking mechanism for the grounding switch; The interlocking mechanism for the grounding switch includes two sets of interlocking components arranged opposite to each other. Each interlocking component includes an interlocking base, an interlocking drive, and an elastic limit component. The interlocking base is used to be installed on the stationary contact seat of the grounding switch; the interlocking drive is rotatably installed on the interlocking base, and rotates when the grounding switch is closed by the push of the moving contact knife; the elastic limiting component is installed on the interlocking base and abuts against at least one surface of the interlocking drive to provide elastic reset force and holding force in the closed state for the interlocking drive.

[0024] The beneficial effects of the grounding switch provided by this invention are as follows: The interlocking mechanism for the grounding switch provided by this invention consists of an interlocking base, an interlocking drive component rotatably mounted on the interlocking base, and an elastic limit component. During the closing process, the moving contact directly drives the interlocking drive component to rotate. During rotation, the interlocking drive component presses against the moving contact to form friction braking and self-locking, eliminating the need for torque amplification or motion conversion via gears. This reduces the types and number of parts, eliminates the high-precision machining, complex assembly, and lubrication maintenance required for gear transmission, and lowers the manufacturing and assembly process difficulty. Furthermore, because this interlocking mechanism uses simple rotation and elastic contact, there are no complex meshing relationships between the components. The assembly relationship is clear, and disassembly and assembly are convenient. In subsequent use of the equipment, if wear or failure occurs, only partial inspection and replacement of the interlocking drive component or the elastic limit component is required, without disassembling the cumbersome gear system, simplifying maintenance operations and shortening the repair cycle.

[0025] In summary, the present invention effectively solves the technical problems of existing linkage mechanisms using gear transmission to achieve torque increase and self-locking, which leads to complex overall structure, high manufacturing and assembly difficulty, and inconvenient maintenance.

[0026] Furthermore, the elastic limiting component includes an upper spring plate and a lower spring plate, which respectively abut against different surfaces of the interlocking drive member.

[0027] Furthermore, the interlocking base is provided with a first groove for accommodating the upper spring plate and a second groove for accommodating the lower spring plate.

[0028] Furthermore, the interlocking drive includes a base plate and a side plate. During the closing process, the moving contact blade contacts the base plate and pushes the interlocking drive to rotate. The side plate is used to press the moving contact blade after the interlocking drive rotates.

[0029] Furthermore, the interlocking drive component includes a horizontal pressing section one, a connecting section, and a horizontal pressing section two. The horizontal pressing section one and the horizontal pressing section two are respectively connected to the lower end and the upper end of the connecting section. The horizontal pressing section one is rotatably mounted on the interlocking base, and the length of the horizontal pressing section one is greater than the length of the horizontal pressing section two.

[0030] Furthermore, a pressing boss is provided at one end of the horizontal pressing section opposite to the connecting section.

[0031] Furthermore, the interlocking base is provided with an arc-extinguishing grid.

[0032] Furthermore, there are two moving contact blades, which are arranged in parallel and connected by an elastic connecting component.

[0033] Furthermore, the elastic connection assembly includes a connecting rod, elastic elements, and an adjusting element; the connecting rod passes through the two moving contact blades; there are two elastic elements, both of which are fitted onto the connecting rod and are located on the outside of the two moving contact blades, respectively, to provide elastic contact pressure for the two moving contact blades to clamp the stationary contact seat; the adjusting element is mounted on the connecting rod to adjust the elastic allowance of the two elastic elements.

[0034] Beneficial effects: The two moving contact blades are connected by a connecting rod, and two elastic elements are located on the outer sides of the two moving contact blades. This symmetrical arrangement ensures that the clamping force applied by the elastic elements to the two moving contact blades is evenly distributed, ensuring that the two moving contact blades can synchronously and symmetrically clamp the stationary contact seat when the circuit is closed. This avoids poor contact or uneven wear caused by uneven force on one side, thereby improving the reliability of contact and current carrying capacity. The structure in which the elastic elements are directly mounted on the connecting rod eliminates the need for additional mounting brackets or complex transmission mechanisms, simplifying the number of parts and assembly relationships, and reducing manufacturing and assembly difficulty.

[0035] Meanwhile, the adjustable mechanism allows the elastic margin of the two elastic elements to be adjusted according to actual operating conditions. This means that the initial compression of the elastic elements can be flexibly adjusted according to the contact pressure design requirements of the grounding switch, thereby precisely controlling the clamping force of the moving contact blade on the stationary contact seat. This adjustable design can meet the high contact pressure requirements during short-circuit current flow while also appropriately reducing pressure under normal operating conditions to minimize contact wear, effectively balancing the dual requirements of current-carrying reliability and mechanical lifespan. Furthermore, when the elastic elements experience fatigue or elasticity decay after long-term use, compensation can be made through the adjustable mechanism, eliminating the need to replace the entire elastic element and reducing maintenance costs and replacement difficulty. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of the interlocking assembly for the grounding switch provided by the present invention; Figure 2 for Figure 1 A cross-sectional view of the interlocking assembly shown; Figure 3 This is a schematic diagram of the structure of the grounding switch when it is closed, as provided by the present invention; Figure 4 for Figure 3 The main view; Figure 5 This is a schematic diagram of the structure of the grounding switch provided by the present invention when it is opened; Figure 6 for Figure 5 The main view; Figure 7 This is a cross-sectional view of the grounding switch provided by the present invention in the closed state; Figure 8This is a schematic diagram of the structure of the interlocking assembly for the grounding switch provided by the present invention in the arc-ignition state.

[0037] Explanation of reference numerals in the attached figures: 1. Interlocking base; 11. Arc extinguishing grid; 2. Interlocking drive component; 21. Horizontal pressing section one; 211. Pressing boss; 22. Connecting section; 23. Horizontal pressing section two; 3. Elastic limiting component; 31. Upper spring plate; 32. Lower spring plate; 4. Stationary contact seat; 5. Moving contact blade; 6. Elastic connecting component; 61. Connecting rod; 62. Elastic element; 63. Adjusting element; 7. Insulating frame; 8. Drive rod; 9. Pin. Detailed Implementation

[0038] The principles and spirit of the present invention will be explained in detail below with reference to several representative embodiments.

[0039] An embodiment of the interlocking mechanism for grounding switches provided by the present invention: like Figures 1 to 8 As shown, the interlocking mechanism for the grounding switch includes two sets of interlocking components arranged opposite to each other. Each interlocking component includes an interlocking base 1, an interlocking drive 2, and an elastic limiting component 3. The interlocking base 1 is mounted on the stationary contact seat 4 of the grounding switch. The interlocking drive 2 is rotatably mounted on the interlocking base 1 and rotates under the push of the moving contact 5 when the grounding switch is closed. The elastic limiting component 3 is mounted on the interlocking base 1 and abuts against at least one surface of the interlocking drive 2 to provide an elastic reset force and a holding force in the closed state for the interlocking drive 2.

[0040] Regarding the interlocking drive component 2: The interlocking drive component 2 includes a base plate and a side plate. During the closing process, the moving contact knife 5 contacts the base plate and pushes the interlocking drive component 2 to rotate. The side plate is used to press the moving contact knife 5 after the interlocking drive component 2 rotates.

[0041] like Figure 1 , Figure 2 and Figure 7 As shown, in this embodiment, the interlocking drive component 2 includes a first horizontal pressing section 21, a connecting section 22, and a second horizontal pressing section 23. The first horizontal pressing section 21 and the second horizontal pressing section 23 are respectively connected to the lower end and the upper end of the connecting section 22. The first horizontal pressing section 21 is rotatably mounted on the interlocking base 1, and the length of the first horizontal pressing section 21 is greater than the length of the second horizontal pressing section 23. In this embodiment, the first horizontal pressing section 21 constitutes the base plate of the interlocking drive component 2, and the connecting section 22 and the second horizontal pressing section 23 constitute the side plate of the interlocking drive component 2. In other embodiments, the side plate only includes a vertical section, or the side plate is an inwardly snapping curved panel.

[0042] like Figure 2 and Figure 7As shown, in this embodiment, a pressing boss 211 is provided at the right end of the horizontal pressing section 21 (i.e., the end of the horizontal pressing section 21 that is away from the connecting section 22).

[0043] like Figure 1 , Figure 2 and Figure 7 As shown, in this embodiment, the horizontal pressing section 21 is rotatably mounted on the interlocking base 1 via the pin 9, and can rotate around the pin 9 at a certain angle to realize the rotational mounting of the interlocking drive component 2 on the interlocking base 1.

[0044] Regarding the elastic limit component 3. For example... Figure 2 and Figure 7 As shown, in this embodiment, the elastic limiting component 3 includes an upper spring plate 31 and a lower spring plate 32. The upper spring plate 31 and the lower spring plate 32 respectively abut against different surfaces of the interlocking drive component 2. The interlocking base 1 is provided with a first groove for accommodating the upper spring plate 31 and a second groove for accommodating the lower spring plate 32. In other embodiments, both the upper spring plate 31 and the lower spring plate 32 are helical compression springs.

[0045] like Figure 2 and Figure 7 As shown, in this embodiment, the upper spring sheet 31 is used to abut against the left side surface of the connecting section 22, and the lower spring sheet 32 ​​is used to abut against the upper surface of the horizontal pressing section 21.

[0046] In addition, such as Figure 1 As shown, in this embodiment, the interlocking base 1 is also provided with an arc-extinguishing grid 11. During the closing process of the grounding switch, when the moving contact 5 approaches the stationary contact 4 to the breakdown distance, if there is residual voltage or short-circuit voltage in the system, an arc will be generated between the moving and stationary contacts. At this time, the arc-extinguishing grid 11 on the upper part of the interlocking base 1 can guide and elongate the arc, introduce the arc into the grid gap to complete cooling and segmentation, and promote the rapid extinguishing of the arc, thereby effectively reducing the arc erosion damage to the moving contact 5 and the stationary contact 4, protecting the integrity of the contact surface, and extending the electrical service life of the grounding switch.

[0047] It should be noted that in this embodiment, the rated operating voltage of the grounding switch is 10kV. Under standard atmospheric conditions (temperature 20℃, air pressure 101.3kPa, dry air), the contact pressure generated when the moving contact 5 of the grounding switch clamps the stationary contact 4 is 260±20N, and the initial pressure of the upper spring plate 31 is 350N, which is significantly greater than the contact pressure generated when the moving contact 5 clamps the stationary contact 4.

[0048] The working principle of the interlocking mechanism for the grounding switch provided by this invention is as follows: When closing, the moving contact 5 moves towards the stationary contact 4, and the arc-extinguishing grid 11 on the interlocking base 1 first guides and extinguishes the closing arc; then the front end of the moving contact 5 touches the pressing boss 211 of the horizontal pressing section 1 21, and under the action of inertia, pushes the interlocking drive 2 to rotate around the pin shaft 9, so that the side plate composed of the connecting section 22 and the horizontal pressing section 23 presses the moving contact 5 accordingly. The greater the closing inertia, the stronger the pressing force, forming a self-locking brake; at the same time, the lower spring plate 32 maintains the initial posture of the interlocking drive 2, and the upper spring plate 31 continuously provides elastic pressing force after closing, ensuring that the moving contact 5 does not retract under short-circuit current, thereby realizing the integrated functions of closing guidance, arc extinguishing, buffering, self-locking and short-circuit protection.

[0049] An embodiment of the grounding switch provided by the present invention: like Figures 3 to 8 As shown, the grounding switch includes an insulating frame 7, a stationary contact base 4, a moving contact blade 5, a drive rod 8, and an interlocking mechanism for the grounding switch. The interlocking mechanism for the grounding switch has the same structure as the interlocking mechanism for the grounding switch described above, and will not be repeated here.

[0050] like Figure 3 As shown, in this embodiment, the stationary contact base 4 is fixedly installed on the insulating frame 7, and the stationary contact base 4 is connected to a grounding circuit; the moving contact blade 5 is rotatably installed on the insulating frame 7, and the moving contact blade 5 is connected to the drive rod 8 so as to drive the moving contact blade 5 to rotate through the drive rod 8; the grounding switch is installed on the stationary contact base 4 by an interlocking mechanism.

[0051] During the closing process of the grounding switch, the drive rod 8 pushes the moving contact 5 to rotate from the open position to the closed position; as Figure 7 As shown, when the moving contact 5 approaches the stationary contact 4 at an air breakdown distance of about 10 mm, and there is residual voltage or short-circuit voltage in the system, an arcing phenomenon will occur between the moving contact 5 and the stationary contact 4. At this time, the interlocking mechanism of the grounding switch can play the role of arc initiation, guiding the arc to the designated area, effectively reducing the ablation damage of the arc to the moving contact 5 and the stationary contact 4.

[0052] like Figures 3 to 8 As shown, in this embodiment, there are two moving blades 5, which are arranged in parallel and connected by an elastic connecting component 6.

[0053] like Figure 3As shown, in this embodiment, the elastic connection assembly 6 includes a connecting rod 61, an elastic element 62, and an adjusting element 63. The connecting rod 61 passes through the two moving contact blades 5. There are two elastic elements 62, both of which are fitted onto the connecting rod 61 and located on the outer side of the two moving contact blades 5, respectively, to provide elastic contact pressure for clamping the stationary contact seat 4. The adjusting element 63 is mounted on the connecting rod 61 to adjust the elastic allowance of the two elastic elements 62. In this embodiment, the elastic element 62 is a spring; in other embodiments, the elastic element 62 is a compression spring or a polyurethane elastic element 62.

[0054] like Figure 3 As shown, in this embodiment, there are two elastic connection components 6, which are arranged at intervals along the length direction of the moving contact blade 5.

[0055] The working principle of the grounding switch provided by this invention is as follows: When closing, the drive rod 8 pushes the two moving contacts 5 to move simultaneously toward the stationary contact 4. When the moving contacts 5 approach the stationary contact 4 to the breakdown distance, the arc-extinguishing grid 11 on the upper part of the interlocking base 1 guides and extinguishes the closing arc; subsequently, the front end of the moving contacts 5 touches the pressing boss 211 of the horizontal pressing section 1 21, and under the action of inertia, pushes the interlocking drive 2 to rotate around the pin 9, so that the side plate formed by the connecting section 22 and the horizontal pressing section 23 presses the moving contacts 5 accordingly. The greater the closing inertia, the stronger the pressing force, forming a self-locking brake; At this time, the lower spring plate 32 maintains the initial posture of the interlocking drive component 2, and the upper spring plate 31 continuously provides elastic clamping force after closing to ensure that the moving contact 5 does not retract under short-circuit current. After closing, the stationary contact 4 is reliably connected to the moving contact 5 and the grounding circuit respectively to form a complete grounding path. In addition, the two moving contacts 5 provide elastic contact pressure to clamp the stationary contact 4 through the spring in the elastic connection component 6. The adjusting component 63 can adjust the spring margin, thereby realizing the comprehensive functions of closing guidance, arc extinguishing, buffering, self-locking, short-circuit protection, and adjustable contact pressure.

[0056] Based on the above description in this specification, those skilled in the art will also understand that the following terms, such as "upper," "lower," "front," "back," "left," "right," "inner," and "outer," which indicate orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings of this specification and should not be understood or interpreted as limiting the present invention.

[0057] In addition, in the description of this specification, "multiple" means at least two, such as two, three or more, etc., unless otherwise expressly and specifically defined.

Claims

1. An interlocking mechanism for a grounding switch, characterized in that, It includes two sets of interlocking assemblies arranged opposite each other, and the interlocking assemblies include interlocking bases, interlocking drive components and elastic limit components; The interlocking base is used to be installed on the stationary contact seat of the grounding switch; the interlocking drive is rotatably installed on the interlocking base, and rotates when the grounding switch is closed by the push of the moving contact knife; the elastic limiting component is installed on the interlocking base and abuts against at least one surface of the interlocking drive to provide elastic reset force and holding force in the closed state for the interlocking drive.

2. The interlocking mechanism for a grounding switch according to claim 1, characterized in that, The elastic limiting component includes an upper spring plate and a lower spring plate, which respectively abut against different surfaces of the interlocking drive component.

3. The interlocking mechanism for a grounding switch according to claim 2, characterized in that, The interlocking base is provided with a first groove for accommodating the upper spring plate and a second groove for accommodating the lower spring plate.

4. The interlocking mechanism for a grounding switch according to any one of claims 1 to 3, characterized in that, The interlocking drive includes a base plate and a side plate. During the closing process, the moving contact blade contacts the base plate and pushes the interlocking drive to rotate. The side plate is used to press the moving contact blade after the interlocking drive rotates.

5. The interlocking mechanism for a grounding switch according to any one of claims 1 to 3, characterized in that, The interlocking drive component includes a horizontal pressing section one, a connecting section and a horizontal pressing section two. The horizontal pressing section one and the horizontal pressing section two are respectively connected to the lower end and the upper end of the connecting section. The horizontal pressing section one is rotatably mounted on the interlocking base, and the length of the horizontal pressing section one is greater than the length of the horizontal pressing section two.

6. The interlocking mechanism for a grounding switch according to claim 5, characterized in that, The horizontal pressing section has a pressing boss at one end opposite to the connecting section.

7. The interlocking mechanism for a grounding switch according to any one of claims 1 to 3, characterized in that, The interlocking base is equipped with an arc-extinguishing grid.

8. A grounding switch, comprising a stationary contact base and a moving contact blade, characterized in that, It also includes the interlocking mechanism for the grounding switch as described in any one of claims 1 to 7.

9. The grounding switch according to claim 8, characterized in that, The number of moving blades is two, and the two moving blades are arranged in parallel and connected by an elastic connecting component.

10. The grounding switch according to claim 9, characterized in that, The elastic connection assembly includes a connecting rod, elastic elements, and an adjusting element; the connecting rod passes through the two moving contact blades; there are two elastic elements, both of which are fitted onto the connecting rod and located on the outside of the two moving contact blades, to provide elastic contact pressure for the two moving contact blades to clamp the stationary contact seat; the adjusting element is mounted on the connecting rod to adjust the elastic allowance of the two elastic elements.

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