Interlocking mechanism of ring main unit and ring main unit

Abstract

The application provides an interlocking mechanism of a ring main unit and the ring main unit. The interlocking mechanism of the ring main unit comprises a grounding switch operating mechanism, a load switch operating mechanism, a grounding switch interlocking plate and a load switch interlocking plate. The grounding switch operating mechanism comprises a grounding switch mounting plate, a grounding switch operating shaft and a grounding switch linkage device. The load switch operating mechanism comprises a load switch mounting plate, a load switch operating shaft and a load switch linkage device. The grounding switch interlocking plate is linked with the rotation of the load switch operating shaft. When the load switch operating shaft drives the load switch to close, the grounding switch interlocking plate blocks the grounding switch operating shaft, preventing the grounding switch from closing. The rotation of the grounding switch operating shaft drives the load switch interlocking module to link. When the grounding switch operating shaft drives the grounding switch to close, the load switch interlocking plate blocks the load switch operating shaft, preventing the load switch from closing. The interlocking mechanism of the ring main unit and the ring main unit prevent misoperation and have high safety.

Description

Technical Field

[0001] This utility model relates to the field of power equipment, and in particular to an interlocking mechanism for a ring main unit and the ring main unit itself. Background Technology

[0002] Currently, ring main units typically refer to load switch cabinets used in ring network power supply systems. These cabinets contain load switches, fuses, operating mechanisms, grounding switches, and mechanical interlocks. Mechanical interlocks are a key means of preventing maloperation of load switches and grounding switches, and their implementation varies, with "locking" mechanical interlocks being the most common. The working logic of this type of interlock structure is as follows: although the operator can initiate an operation, the operation cannot be completed because the core components are locked, thus preventing maloperation.

[0003] However, this single-locking mechanical interlock has significant shortcomings: because operators can only perceive the "no movement" as a sign of mechanical inertia, they may misinterpret this as a component jamming rather than an interlock, leading them to force the operation. Such forced operation can easily damage the interlocking structure, causing the interlocking function to fail and potentially resulting in a serious electrical safety accident. Utility Model Content

[0004] One objective of this utility model is to address the shortcomings of the existing technology and provide an interlocking mechanism for a ring main unit and a ring main unit to prevent misoperation.

[0005] An interlocking mechanism for a ring main unit includes: A grounding switch operating mechanism includes a grounding switch mounting plate, a grounding switch operating shaft, and a grounding switch linkage device. The grounding switch operating shaft is rotatably mounted on the grounding switch mounting plate. One end of the grounding switch linkage device is connected to the grounding switch operating shaft. Rotation of the grounding switch operating shaft drives the grounding switch linkage device to rotate. A load switch operating mechanism includes a load switch mounting plate, a load switch operating shaft, and a load switch linkage device. The load switch operating shaft is rotatably mounted on the load switch mounting plate. One end of the load switch linkage device is connected to the load switch operating shaft. Rotation of the load switch operating shaft drives the load switch linkage device to rotate. A grounding switch interlocking plate, one end of which is connected to the load switch linkage device, and the other end is movably connected to the grounding switch mounting plate. The grounding switch interlocking plate is linked by the rotation of the load switch operating shaft. When the load switch operating shaft drives the load switch to close, the grounding switch interlocking plate blocks the grounding switch operating shaft, preventing the grounding switch from closing. The load switch interlocking plate has one end connected to the grounding switch linkage device and the other end movably connected to the load switch mounting plate. The load switch interlocking module is linked by the rotation of the grounding switch operating shaft. When the grounding switch operating shaft drives the grounding switch to close, the load switch interlocking plate blocks the load switch operating shaft and prevents the load switch from closing.

[0006] Furthermore, the load switch interlocking plate is provided with a first sliding groove, and a first guide post is fixedly provided on the load switch mounting plate. The first guide post is rotatably inserted into the first sliding groove and slides along the first sliding groove. Furthermore, the grounding switch interlocking plate is provided with a second sliding groove, and a second guide post is fixedly provided on the grounding switch mounting plate. The second guide post is rotatably inserted into the second sliding groove and slides along the second sliding groove. Furthermore, a door lifting module is provided below the grounding switch mounting plate. The door lifting module includes a lifting plate, a lifting limit plate, and an interlocking rod. The lifting plate is installed on the grounding switch mounting plate, the lifting limit plate is located above the lifting plate, and the interlocking rod is located below the lifting plate. The interlocking rod is used to interlock with the door of the ring main unit.

[0007] Furthermore, the grounding switch linkage device includes a grounding limit plate, which is connected to the grounding switch operating shaft via a transmission, and the grounding limit plate is disposed opposite to the lifting limit plate; When the grounding switch is tripped, the grounding limit plate and the lifting limit plate abut against each other to restrict the lifting plate from rising, and the interlocking rod is interlocked with the door of the ring main unit; When the grounding switch is closed, the grounding limit plate separates from the lifting limit plate, and the lifting plate is lifted to unlock the door of the ring main unit by the interlocking rod.

[0008] Furthermore, the lifting limiting plate includes multiple bending portions and abutting portions. The multiple bending portions are continuously distributed and bend toward the grounding limiting plate. The abutting portions bend back to form an abutting surface for abutting against the grounding limiting plate.

[0009] Furthermore, the grounding switch linkage device also includes a first link, a second link, a third link, and a first pin. One end of the first link is drivenly connected to the grounding switch operating shaft, the other end of the first link is rotatably connected to one end of the second link, the other end of the second link is rotatably connected to the third link, and the third link is rotatably mounted on the grounding switch mounting plate via the first pin.

[0010] Furthermore, the load switch interlocking plate has a stepped portion at one end near the grounding switch operating shaft, and the stepped portion blocks the end of the load switch operating shaft.

[0011] Furthermore, the grounding switch interlocking plate and the load switch interlocking plate are arranged intersectingly, and the grounding switch interlocking plate is provided with a clearance portion, which forms a space for clearance of the load switch interlocking plate.

[0012] A ring main unit includes a cabinet and an air box, a load switch, a grounding switch, and an interlocking mechanism located inside the cabinet. The grounding switch mounting plate is used to fix the air box of the ring main unit to the front plate, and the load switch mounting plate is used to fix the air box of the ring main unit to the front plate.

[0013] As can be seen from the above technical solution, this utility model has at least the following advantages and positive effects: In this utility model, the aforementioned ring main unit and its interlocking mechanism achieve bidirectional interlocking between the load switch and the grounding switch through two sets of transmission combinations: "load switch linkage device to grounding switch interlocking plate" and "grounding switch linkage device to load switch interlocking plate". This structurally prevents erroneous operations such as "operating the grounding switch when the load switch is energized" and "operating the load switch when the grounding switch is closed".

[0014] The grounding switch and cable compartment door are linked by the position of the grounding limit plate and the lifting limit plate. This directly links the status of the grounding switch with the opening authority of the cable compartment door, ensuring that the cable compartment door can only be opened when the grounding switch is closed, i.e. when the cable compartment is de-energized, thus avoiding the risk of opening the door while it is energized.

[0015] Furthermore, the aforementioned ring main unit and its interlocking mechanism have a compact structure, with the door lifting module directly integrated into the grounding switch operating mechanism, significantly reducing the overall size of the ring main unit and making it suitable for relatively small installation spaces. Attached Figure Description

[0016] Figure 1 This is a perspective view of the interlocking mechanism of a ring main unit according to one embodiment of the present invention; Figure 2 yes Figure 1 The side view of the interlocking mechanism of the ring main unit shown; Figure 3 for Figure 2 The diagram shows the structure of the interlocking mechanism of the ring main unit when the load switch is open and the grounding switch is closed. Figure 4 for Figure 1 The diagram shows the structure of the interlocking mechanism of the ring main unit, with the load switch closing and the grounding switch opening. Figure 5 for Figure 2The diagram shows the structure of the interlocking mechanism of the ring main unit when the load switch is open, the grounding switch is closed, and the door is lifted.

[0017] The annotations in the attached figures are explained as follows: 11. Grounding switch operating mechanism; 12. Load switch operating mechanism; 13. Grounding switch interlocking plate; 14. Load switch interlocking plate; 111. Grounding switch mounting plate; 112. Grounding switch operating shaft; 113. Grounding switch linkage device; 114. First connecting rod; 115. Second connecting rod; 116. Third connecting rod; 117. First pin; 118. Fourth connecting rod; 121. Load switch mounting plate; 122. Load switch operating shaft; 131. Fifth connecting rod; 132. Second pin; 133. Second slide groove; 134. Second guide post; 135. Clearance part; 141. First slide groove; 142. First guide post; 143. Step section; 15. Door opening and lifting module; 151. Lifting plate; 152. Lifting limit plate; 153. Interlocking rod; 154. Bending part; 155. Supporting part. Detailed Implementation

[0018] Typical embodiments embodying the features and advantages of this utility model will be described in detail in the following description. It should be understood that this utility model can have various variations in different embodiments, all of which do not depart from the scope of this utility model, and the descriptions and illustrations therein are for illustrative purposes only and not intended to limit this utility model.

[0019] In the description of this application, it should be understood that, in the embodiments shown in the accompanying drawings, the indications of direction or positional relationships (such as up, down, left, right, front, and back, etc.) are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. These descriptions are appropriate when these elements are in the positions shown in the accompanying drawings. If the description of the positions of these elements changes, these directional indications also change accordingly.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0021] This embodiment provides a ring main unit, which includes a cabinet (not shown), a gas box (not shown) located inside the cabinet, a load switch (not shown), a grounding switch (not shown), and an interlocking mechanism between the load switch and the grounding switch. A grounding switch mounting plate is used to fix the load switch to the front plate of the gas box of the ring main unit, and a load switch mounting plate is used to fix the load switch to the front plate of the gas box of the ring main unit.

[0022] The cabinet comprises multiple compartments, such as a mechanism compartment, a cable compartment, and a control compartment. The load switch, grounding switch, and the interlocking mechanism between the load switch and the grounding switch are located in the mechanism compartment. The front of this mechanism compartment has a door, allowing operators to operate the grounding switch and load switch by using buttons on the grounding switch and load switch located on the door. The front of the cable compartment has a cable compartment door, which can be opened for maintenance personnel to perform repairs and maintenance.

[0023] A gas-insulated switchgear, also known as a gas-filled cabinet or sealed gas-filled enclosure, is a core component of gas-insulated metal-enclosed switchgear. It is a completely sealed enclosure welded from stainless steel or aluminum alloy, filled with a gas possessing insulating and arc-extinguishing properties, and encloses the main high-voltage live components of the ring main unit, such as load switches, disconnect switches, grounding switches, and fuses.

[0024] A load switch is a switching device whose function falls between that of a circuit breaker and a disconnector. A grounding switch is a mechanical switching device used to directly connect a line to the earth.

[0025] Please see Figure 1 and Figure 2 The interlocking mechanism of the ring main unit includes: grounding switch operating mechanism 11, load switch operating mechanism 12, grounding switch interlocking plate 13 and load switch interlocking plate 14.

[0026] The grounding switch operating mechanism 11 includes a grounding switch mounting plate 111, a grounding switch operating shaft 112, and a grounding switch linkage device 113.

[0027] The grounding switch mounting plate 111 can be fixed on the front plate of the gas box of the ring main unit. The grounding switch mounting plate 111 provides a mounting support surface for the grounding switch operating shaft 112 and the grounding switch linkage device 113.

[0028] The grounding switch operating shaft 112 is rotatably mounted on the grounding switch mounting plate 111. One end of the grounding switch operating shaft 112 is the operating end, which exposes the grounding switch mounting plate 111, facilitating rotation by the operator. The operator can control the grounding switch by rotating the grounding switch operating shaft 112. Specifically, the grounding switch operating shaft 112 can be a polygonal pin.

[0029] One end of the grounding switch linkage device 113 is connected to the grounding switch operating shaft 112 for transmission. The rotation of the grounding switch operating shaft 112 drives the grounding switch linkage device 113 to rotate. The grounding switch linkage device 113 can be a linkage structure, a gear structure, or a combination of linkage and gear structures. The linkage structure can be a 3-link or 4-link structure, etc. The grounding switch linkage device 113 can transmit the rotational motion of the grounding switch operating shaft 112, thereby enabling the load switch interlocking plate 14 to be driven.

[0030] Specifically, in this embodiment, the grounding switch linkage device 113 includes a first connecting rod 114, a second connecting rod 115, a third connecting rod 116, a first pin 117, and a fourth connecting rod 118. The first connecting rod 114, second connecting rod 115, and third connecting rod 116 form a linkage structure. One end of the first connecting rod 114 is drivenly connected to the grounding switch operating shaft 112, and the other end of the first connecting rod 114 is rotatably connected to one end of the second connecting rod 115. The other end of the second connecting rod 115 is rotatably connected to the third connecting rod 116. The third connecting rod 116 is rotatably mounted on the grounding switch mounting plate 111 via the first pin 117. When the grounding switch operating shaft 112 is rotated, the first connecting rod 114, second connecting rod 115, and third connecting rod 116 swing. The rotation of the third connecting rod 116 drives the rotation of the first pin 117. The fourth connecting rod 118 is drivenly connected to the first pin 117; the rotation of the first pin 117 drives the swing of the fourth connecting rod 118.

[0031] The load switch operating mechanism 12 includes a load switch mounting plate 121, a load switch operating shaft 122, and a load switch linkage device. The load switch operating shaft 122 is rotatably mounted on the load switch mounting plate 121. One end of the load switch linkage device is connected to the load switch operating shaft 122 for transmission, and the rotation of the load switch operating shaft 122 drives the load switch linkage device to rotate. The specific structure of the load switch linkage device can be a linkage structure, a gear structure, etc. The load switch linkage device can transmit the rotational motion of the load switch operating shaft 122, so that the grounding switch interlocking plate 13 can be driven.

[0032] One end of the load switch interlocking plate 14 is connected to the grounding switch linkage device 113. Specifically, one end of the load switch interlocking plate 14 is fixedly connected to the first pin 117 via the fourth link 118. When the first pin 117 rotates, it causes the load switch interlocking plate 14 to swing, causing the end of the load switch interlocking plate 14 to move away from the first pin 117.

[0033] The end of the load switch interlocking plate 14 furthest from the first pin 117 is positioned close to the load switch operating shaft 122. This end of the load switch interlocking plate 14 can be moved to either block or expose the load switch operating shaft 122. When the load switch interlocking plate 14 blocks the load switch operating shaft 122, it obstructs the operator's operation, preventing rotation of the load switch operating shaft 122 and thus preventing operation of the load switch.

[0034] That is, the load switch interlocking plate 14 is linked by the rotation of the grounding switch operating shaft 112. When the grounding switch operating shaft 112 drives the grounding switch to close, the load switch interlocking plate 14 blocks the load switch operating shaft 122, preventing the load switch from closing.

[0035] Please see Figure 3 Specifically, in this embodiment, a first groove 141 is provided at one end of the load switch interlocking plate 14 near the grounding switch operating shaft 112. A first guide post 142 is fixedly provided on the load switch mounting plate 121. The first guide post 142 is rotatably inserted into the first groove 141 and slides along the first groove 141. The first guide post 142 and the first groove 141 cooperate with each other to guide the movement of the load switch interlocking plate 14, ensuring that the load switch interlocking plate 14 can move accurately toward or away from the grounding switch operating shaft 112.

[0036] Furthermore, the load switch interlocking plate 14 has a stepped portion 143 at one end near the grounding switch operating shaft 112, which blocks the end of the load switch operating shaft 122. The stepped portion 143 can prevent interference between the load switch interlocking plate 14 and the end of the load switch operating shaft 122.

[0037] When the ring main unit is in the initial state of "grounding switch open, load switch open", if the operator operates the grounding switch operating shaft 112 to close the grounding switch, after the closing action is completed, the grounding switch linkage device 113 rotates a specific angle with the closing action. The rotation of the grounding switch linkage device 113 causes the load switch interlocking plate 14 to shift, ultimately causing the load switch interlocking plate 14 to block the operating path of the load switch operating shaft 122. At this time, the load switch operating shaft 122 cannot be operated, satisfying the interlocking requirement of "when the grounding switch is closed, the load switch is prohibited from being operated". Only when the grounding switch is opened and the load switch interlocking plate 14 is reset can the load switch resume operation.

[0038] Please see Figure 3 and Figure 4Specifically, in this embodiment, one end of the grounding switch interlocking plate 13 is connected to the load switch linkage device via a transmission connection. Specifically, the load switch linkage device may include a fifth link 131 and a second pin 132. One end of the grounding switch interlocking plate 13 is fixedly connected to the second pin 132 via the fifth link 131. When the second pin 132 rotates, it causes the grounding switch interlocking plate 13 to swing, moving the end of the grounding switch interlocking plate 13 away from the second pin 132.

[0039] The grounding switch interlocking plate 13 has a second groove 133 at one end near the grounding switch operating shaft 112. A second guide post 134 is fixedly mounted on the grounding switch mounting plate 111. The second guide post 134 is rotatably inserted into the second groove 133 and slides along the second groove 133. The second guide post 134 and the second groove 133 cooperate with each other to guide the movement of the grounding switch interlocking plate 13, ensuring that the grounding switch interlocking plate 13 can move accurately toward or away from the grounding switch operating shaft 112.

[0040] The grounding switch interlocking plate 13 and the load switch interlocking plate 14 are arranged intersectingly. The grounding switch interlocking plate 13 and the load switch interlocking plate 14 move intersectingly. The grounding switch interlocking plate 13 is provided with a clearance portion 135, which forms a space for clearing the load switch interlocking plate 14. The clearance portion 135 prevents the grounding switch interlocking plate 13 and the load switch interlocking plate 14 from interfering with each other during movement.

[0041] The grounding switch interlocking plate 13 is linked by the rotation of the load switch operating shaft 122. When the load switch operating shaft 122 drives the load switch to close, the grounding switch interlocking plate 13 blocks the grounding switch operating shaft 112, preventing the grounding switch from closing.

[0042] The end of the grounding switch interlocking plate 13 furthest from the load switch linkage device is movably connected to the grounding switch mounting plate 111. The grounding switch interlocking plate 13 is linked by the rotation of the load switch operating shaft 122. When the load switch operating shaft 122 drives the load switch to close, the grounding switch interlocking plate 13 blocks the grounding switch operating shaft 112, preventing the grounding switch from closing.

[0043] When the ring main unit is in the initial state of "grounding switch open, load switch open", neither the load switch operating shaft 122 nor the grounding switch operating shaft 112 is obstructed, and operation can be initiated normally. The operator operates the load switch operating shaft 122 to close the load switch. After the closing action is completed, the load switch linkage device rotates a specific angle with the closing action. This rotation causes the grounding switch interlocking plate 13 to shift, ultimately blocking the operating path of the grounding switch operating shaft 112. At this time, the grounding switch operating shaft 112 cannot be operated, satisfying the interlocking requirement of "grounding switch operation is prohibited when the load switch is energized". Only after the load switch is opened and the grounding switch interlocking plate 13 is reset can the grounding switch resume operation.

[0044] Please see Figure 5 A door lifting module 15 is provided below the grounding switch mounting plate 111. The door lifting module 15 includes a lifting plate 151, a lifting limit plate 152, and an interlocking rod 153. The lifting plate 151 is installed on the grounding switch mounting plate 111. The lifting limit plate 152 is located above the lifting plate 151, and the interlocking rod 153 is located below the lifting plate 151. The interlocking rod 153 is used to interlock with the door of the ring main unit.

[0045] The grounding switch linkage device 113 includes a grounding limiting plate. The grounding limiting plate is drive-connected to the grounding switch operating shaft 112. Specifically, in this embodiment, the grounding limiting plate can be a first connecting rod 114. One end of the first connecting rod 114 away from the grounding switch operating shaft 112 extends beyond the connection point between the first connecting rod 114 and the second connecting rod 115. The first connecting rod 114 enables the load switch interlocking plate 14 to function as the grounding limiting plate. In other embodiments, the grounding limiting plate can also be an independent plate structure, disposed on the grounding switch operating shaft 112, and drive-connected to the grounding switch operating shaft 112.

[0046] The lifting limit plate 152 includes a plurality of bent portions 154 and abutting portions 155. The plurality of bent portions 154 are continuously distributed and bend toward the grounding limit plate. The plurality of bent portions 154 are interconnected, which can increase the structural strength of the lifting limit plate 152. The abutting portions 155 are bent back to form an abutting surface for abutting against the grounding limit plate.

[0047] When the grounding switch is tripped, the grounding limit plate and the lifting limit plate 152 abut against each other to limit the lifting plate 151 from lifting. The interlocking rod 153 is interlocked with the door of the ring main unit.

[0048] When the grounding switch is closed, the grounding limit plate separates from the lifting limit plate 152, and the lifting plate 151 is lifted to unlock the door of the ring main unit by the interlocking rod 153.

[0049] When the grounding switch is in the open position, the grounding limit plate remains on the right side, precisely blocking the upward movement of the lifting limit plate 152. When the grounding switch switches to the closed position, the grounding limit plate rotates to the left side as the grounding switch moves, releasing the movement path of the lifting limit plate 152. At this time, the door opening lifting module 15 can move upward, and the interlocking relationship between the two shafts of its lower interlocking rod 153 and the cable compartment door is released, allowing the operator to open the cable compartment door, thus meeting the safety requirement that "the cable compartment door can only be opened when the grounding switch is closed." Therefore, the opening of the cable compartment door of the ring main unit is linked to the grounding switch status, preventing "opening the cable compartment door while it is energized," improving safety, and preventing misoperation.

[0050] The aforementioned ring main unit and its interlocking mechanism achieve bidirectional interlocking between the load switch and the grounding switch through two sets of transmission combinations: "load switch linkage device to grounding switch interlocking plate 13" and "grounding switch linkage device 113 to load switch interlocking plate 14". This structurally prevents erroneous operations such as "operating the grounding switch when the load switch is energized" and "operating the load switch when the grounding switch is closed".

[0051] The grounding switch and cable compartment door are linked by the position of the grounding limit plate and the lifting limit plate 152. This directly links the grounding switch status with the cable compartment door opening authority, ensuring that the cable compartment door can only be opened when the grounding switch is closed, i.e. when the cable compartment is de-energized, thus avoiding the risk of opening the door while it is energized.

[0052] Furthermore, the aforementioned ring main unit and its interlocking mechanism have a compact structure, with the door lifting module 15 directly integrated into the grounding switch operating mechanism 11, which significantly reduces the overall volume of the ring main unit and makes it suitable for relatively small installation spaces.

[0053] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terminology used is descriptive and exemplary, and not restrictive. Since the present invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. An interlocking mechanism for a ring main unit, characterized in that, include: A grounding switch operating mechanism includes a grounding switch mounting plate, a grounding switch operating shaft, and a grounding switch linkage device. The grounding switch operating shaft is rotatably mounted on the grounding switch mounting plate. One end of the grounding switch linkage device is connected to the grounding switch operating shaft. Rotation of the grounding switch operating shaft drives the grounding switch linkage device to rotate. A load switch operating mechanism includes a load switch mounting plate, a load switch operating shaft, and a load switch linkage device. The load switch operating shaft is rotatably mounted on the load switch mounting plate. One end of the load switch linkage device is connected to the load switch operating shaft. Rotation of the load switch operating shaft drives the load switch linkage device to rotate. The grounding switch interlocking plate has one end connected to the load switch linkage device and the other end movably connected to the grounding switch mounting plate. The grounding switch interlocking plate is linked under the rotation of the load switch operating shaft. When the load switch operating shaft drives the load switch to close, the grounding switch interlocking plate blocks the grounding switch operating shaft and prevents the grounding switch from closing. and The load switch interlocking plate has one end connected to the grounding switch linkage device and the other end movably connected to the load switch mounting plate. The load switch interlocking module is linked by the rotation of the grounding switch operating shaft. When the grounding switch operating shaft drives the grounding switch to close, the load switch interlocking plate blocks the load switch operating shaft and prevents the load switch from closing.

2. The interlocking mechanism of the ring main unit according to claim 1, characterized in that, The load switch interlocking plate is provided with a first sliding groove, and the load switch mounting plate is fixedly provided with a first guide post. The first guide post is rotatably inserted into the first sliding groove and slides along the first sliding groove.

3. The interlocking mechanism of the ring main unit according to claim 1, characterized in that, The grounding switch interlocking plate is provided with a second sliding groove, and a second guide post is fixedly provided on the grounding switch mounting plate. The second guide post is rotatably inserted into the second sliding groove and slides along the second sliding groove.

4. The interlocking mechanism of the ring main unit according to claim 1, characterized in that, The grounding switch mounting plate is provided with a door lifting module below it. The door lifting module includes a lifting plate, a lifting limit plate and an interlocking rod. The lifting plate is installed on the grounding switch mounting plate. The lifting limit plate is located above the lifting plate. The interlocking rod is located below the lifting plate and is used to interlock with the door of the ring main unit.

5. The interlocking mechanism of the ring main unit according to claim 4, characterized in that, The grounding switch linkage device includes a grounding limit plate, which is connected to the grounding switch operating shaft via a transmission, and the grounding limit plate is disposed opposite to the lifting limit plate; When the grounding switch is tripped, the grounding limit plate and the lifting limit plate abut against each other to restrict the lifting plate from rising, and the interlocking rod is interlocked with the door of the ring main unit; When the grounding switch is closed, the grounding limit plate separates from the lifting limit plate, and the lifting plate is lifted to unlock the door of the ring main unit by the interlocking rod.

6. The interlocking mechanism of the ring main unit according to claim 5, characterized in that, The lifting limiting plate includes multiple bending portions and abutting portions. The multiple bending portions are continuously distributed and bend toward the grounding limiting plate. The abutting portions bend back to form an abutting surface for abutting against the grounding limiting plate.

7. The interlocking mechanism of the ring main unit according to claim 1, characterized in that, The grounding switch linkage device further includes a first link, a second link, a third link, and a first pin. One end of the first link is drivenly connected to the grounding switch operating shaft, and the other end of the first link is rotatably connected to one end of the second link. The other end of the second link is rotatably connected to the third link, and the third link is rotatably mounted on the grounding switch mounting plate via the first pin.

8. The interlocking mechanism of the ring main unit according to claim 1, characterized in that, The load switch interlocking plate has a stepped portion at one end near the grounding switch operating shaft, and the stepped portion covers the end of the load switch operating shaft.

9. The interlocking mechanism of the ring main unit according to claim 1, characterized in that, The grounding switch interlocking plate and the load switch interlocking plate are arranged intersectingly. The grounding switch interlocking plate is provided with a clearance part, which forms a space for clearance of the load switch interlocking plate.

10. A ring main unit, characterized in that, The device includes a cabinet and an air box, a load switch, a grounding switch, and an interlocking mechanism as described in any one of claims 1 to 9, wherein the grounding switch mounting plate is used to fix the device to the front plate of the air box of the ring main unit, and the load switch mounting plate is used to fix the device to the front plate of the air box of the ring main unit.

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