A new switch cabinet lower door interlocking mechanism

Abstract

The utility model discloses a novel switchgear lower door interlocking mechanism belongs to electric power equipment safety interlocking technical field, wherein, interlock upper and lower slide plate and lower door limiting plate slide fit, when interlock upper and lower slide plate move up and down, drive the lower door limiting plate transverse movement to selectively extend or exit the upper slot mouth. The utility model has reduced operation step, has reduced the misoperation risk, has guaranteed the safety of operating personnel.

Description

Technical Field

[0001] This utility model belongs to the field of power equipment safety interlocking technology, specifically, it relates to a novel switch cabinet lower door interlocking mechanism. Background Technology

[0002] With the continuous transformation of urban power distribution networks, switchgear is widely used in power systems. The State Grid Corporation of China has put forward five safety requirements for switchgear operation, including preventing accidental entry into energized compartments and preventing closing switches with grounded wires connected. The lower cabinet door, as the main entry point for cable operations, has an interlocking mechanism that is crucial to ensuring the realization of these five safety features. Existing interlocking mechanisms are complex in structure, have many parts, poor stability, and are inconvenient to operate, posing safety hazards. Utility Model Content

[0003] To address the aforementioned problems, this utility model proposes a switch cabinet lower door interlocking mechanism that is compact, easy to operate, and highly reliable, thereby solving the problems of complex structure, poor stability, and high risk of misoperation in the prior art.

[0004] A novel switchgear lower door interlocking mechanism includes an upper slot formed in the lower door, and further includes: An interlocking fixing base plate is used to fix the switch cabinet frame; Interlocking upper and lower sliding plates, wherein the interlocking upper and lower sliding plates are slidably connected to the interlocking fixed base plate via a limiting component; The lower door limiting plate is slidably connected to the interlocking upper and lower sliding plates and is located above the upper slot. The interlocking upper and lower sliding plates are slidably engaged with the lower door limiting plate. When the interlocking upper and lower sliding plates move up and down, they drive the lower door limiting plate to move laterally, so as to selectively extend into or out of the upper slot.

[0005] Furthermore, a spring sheet is provided inside the upper slot, with one end of the spring sheet fixed to the lower door and the other end being a free end; When the lower door is installed in the switch cabinet, the spring sheet is flattened; when the lower door is removed, the free end of the spring sheet is raised and interferes with the lower door limiting plate to restrict its movement.

[0006] Furthermore, a downwardly extending limiting block is provided at the bottom of the lower door limiting plate; The limiting block corresponds to the position of the upper slot. When the lower door limiting plate moves laterally to the locked position, the limiting block extends into the upper slot to prevent the lower door from opening. When the lower door limiting plate moves laterally to the unlocked position, the limiting block exits the upper slot, allowing the lower door to open.

[0007] Furthermore, the limiting component includes a spring plate and a return spring. The spring plate is disposed on the interlocking fixed base plate. One end of the return spring is connected to the spring plate, and the other end is connected to the interlocking upper and lower sliding plates to provide an upward return force.

[0008] Furthermore, the top of the lower door limiting plate is also provided with an inclined guide groove plate, and the interlocking upper and lower sliding plates are provided with guide pins that cooperate with the inclined guide groove of the inclined guide groove plate. When the interlocking upper and lower sliding plates move up and down, the lower door limiting plate is driven to move laterally through the cooperation of the guide pin and the inclined guide groove plate.

[0009] Furthermore, the upper part of the interlocking upper and lower sliding plates is provided with an operating part for receiving external operating force to move it downward.

[0010] The beneficial effects of this utility model are: 1. The compact and miniaturized design reduces the number of main circuit interlocking parts and improves reliability; 2. Due to its simple structure, structural stability is improved; 3. It reduces the number of operating steps, lowers the risk of misoperation, and ensures the safety of operators; 4. It is easy to operate, ensuring practical operability. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of a novel switchgear lower door interlocking mechanism according to this utility model. Figure 1 ; Figure 2 This is a schematic diagram of the structure of a novel switchgear lower door interlocking mechanism according to this utility model. Figure 2 ; Figure 3 This is a schematic diagram of the structure of a novel switchgear lower door interlocking mechanism according to this utility model. Figure 3 ; In the diagram: 1. Interlocking upper and lower sliding plates; 2. Interlocking fixed base plate; 3. Spring hanging plate; 4. Return spring; 5. Angled guide groove plate; 6. Lower door limit plate; 7. Spring plate. Detailed Implementation

[0012] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0013] Example 1

[0014] refer to Figures 1-3 A novel switchgear lower door interlocking mechanism includes an upper slot formed in the lower door, and further includes: Interlocking fixing base plate 2, which is used to fix the switch cabinet frame; Interlocking upper and lower sliding plates 1 are slidably connected to the interlocking fixed base plate 2 via a limiting component; The lower door limit plate 6 is slidably connected to the interlocking upper and lower sliding plates 1 and is located above the upper groove opening; The interlocking upper and lower sliding plates 1 and the lower door limit plate 6 are slidably engaged. When the interlocking upper and lower sliding plates 1 move up and down, they drive the lower door limit plate 6 to move laterally, so as to selectively extend into or out of the upper slot.

[0015] Preferably, a spring sheet 7 is provided in the upper groove, one end of the spring sheet 7 is fixed to the lower door, and the other end is a free end; When the lower door is installed in the switch cabinet, the spring plate 7 is flattened; when the lower door is removed, the free end of the spring plate 7 is raised and interferes with the lower door limit plate to restrict its movement.

[0016] Preferably, the bottom of the lower door limiting plate 6 is provided with a downwardly extending limiting block; The limiting block corresponds to the position of the upper slot. When the lower door limiting plate 6 moves laterally to the locked position, the limiting block extends into the upper slot to prevent the lower door from opening. When the lower door limiting plate 6 moves laterally to the unlocked position, the limiting block exits the upper slot, allowing the lower door to open.

[0017] Preferably, the limiting component includes a spring plate 3 and a return spring 4. The spring plate 3 is disposed on the interlocking fixed base plate 2. One end of the return spring 4 is connected to the spring plate 3, and the other end is connected to the interlocking upper and lower sliding plates 1 to provide an upward return force.

[0018] Preferably, the top of the lower door limiting plate 6 is also provided with an inclined guide groove plate 5, and the interlocking upper and lower sliding plates 1 are provided with guide pins that cooperate with the inclined guide groove of the inclined guide groove plate 5. When the interlocking upper and lower sliding plate 1 moves up and down, it drives the lower door limit plate 6 to move laterally through the cooperation of the guide pin and the inclined guide groove plate 5.

[0019] Preferably, the upper part of the interlocking upper and lower sliding plate 1 is provided with an operating part for receiving external operating force to move it downward.

[0020] In this embodiment, the interlocking fixed base plate 2 is also provided with a vertical slide groove, through which the interlocking upper and lower slide plates achieve vertical guiding movement.

[0021] Working principle: Under normal working conditions (excluding grounding maintenance), such as Figure 1As shown, the interlocking upper and lower sliding plates 1 are located at the upper position, the lower door limit plate 5 is correspondingly located on the right side, the return spring 4 is in the initial free state, and the spring plate 7 is flattened by the pressure of the lower door. In this state, the interlocking upper and lower sliding plates 1 are limited by the internal mechanism of the switch cabinet and cannot move down, so that the lower door limit plate 5 keeps blocking the lower door 8, thereby achieving reliable locking of the lower door and effectively preventing personnel from accidentally entering the energized compartment.

[0022] When the switchgear needs maintenance, it should first be set to the grounded safety state (i.e., the disconnecting switch and circuit breaker should be operated to the grounded position). Afterward, the interlocking mechanism enters the operable mode: sliding the interlocking upper and lower sliding plates 1 downward to their lower positions drives the lower door limit plate 5 to move to the left via the sliding engagement structure, causing its bottom limit block to disengage from the upper slot of the lower door, thus opening the lower door. During this process, the return spring 4 is stretched and stores potential energy, preparing for subsequent reset. The overall state is as follows. Figure 2 As shown.

[0023] During maintenance, the lower door was disassembled. At this time, spring plate 7 automatically tilted upwards due to loss of pressure, and its free end mechanically interfered with the lower door limit plate 5, preventing it from springing back to the right. This interference locked the entire interlocking mechanism in the maintenance position (i.e., the lower door limit plate is on the left), thus ensuring that personnel cannot operate the isolating switch or circuit breaker, strictly meeting the "five-proof" requirements of "preventing closing with a grounded wire," and the status is as follows. Figure 3 As shown.

[0024] After maintenance, reinstalling the lower door is the first priority. During the lower door's positioning, the spring plate 7 is flattened, releasing its restriction on the movement of the lower door limit plate 5. Subsequently, the tensioned return spring 4 releases its stored elastic potential energy, automatically pulling the interlocking upper and lower sliding plates 1 back to their initial upper position. This action, through the sliding engagement structure, drives the lower door limit plate 5 to move synchronously to the right, causing its bottom limit block to realign with the upper slot of the lower door 8, thus completely restoring the entire mechanism to its original position. Figure 1 The normal working state shown ensures the continuity of the "five-prevention" interlocking function.

[0025] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model are included within the protection scope of this utility model.

Claims

1. A novel interlocking mechanism for the lower door of a switchgear, comprising an upper slot formed in the lower door, characterized in that, Also includes: Interlocking fixing base plate, which is used to fix the switch cabinet frame; The interlocking upper and lower sliding plates are slidably connected to the interlocking fixed base plate via a limiting component. The lower door limiting plate is slidably connected to the interlocking upper and lower sliding plates and is located above the upper slot. The interlocking upper and lower sliding plates are slidably engaged with the lower door limiting plate. When the interlocking upper and lower sliding plates move up and down, they drive the lower door limiting plate to move laterally, so as to selectively extend into or out of the upper slot.

2. The novel switchgear lower door interlocking mechanism according to claim 1, characterized in that, A spring sheet is provided in the upper slot, with one end of the spring sheet fixed to the lower door and the other end being a free end; When the lower door is installed in the switch cabinet, the spring sheet is flattened; when the lower door is removed, the free end of the spring sheet is raised and interferes with the lower door limiting plate to restrict its movement.

3. The novel switchgear lower door interlocking mechanism according to claim 2, characterized in that, The bottom of the lower door limiting plate is provided with a downwardly extending limiting block; The limiting block corresponds to the position of the upper slot. When the lower door limiting plate moves laterally to the locked position, the limiting block extends into the upper slot to prevent the lower door from opening. When the lower door limiting plate moves laterally to the unlocked position, the limiting block exits the upper slot, allowing the lower door to open.

4. The novel switchgear lower door interlocking mechanism according to claim 1, characterized in that, The limiting assembly includes a spring mounting plate and a return spring. The spring mounting plate is disposed on the interlocking fixed base plate. One end of the return spring is connected to the spring mounting plate, and the other end is connected to the interlocking upper and lower sliding plates to provide an upward return force.

5. The novel switchgear lower door interlocking mechanism according to claim 1, characterized in that, The top of the lower door limiting plate is also provided with an inclined guide groove plate, and the interlocking upper and lower sliding plates are provided with guide pins that cooperate with the inclined guide groove of the inclined guide groove plate. When the interlocking upper and lower sliding plates move up and down, the lower door limiting plate is driven to move laterally through the cooperation of the guide pin and the inclined guide groove plate.

6. The novel switchgear lower door interlocking mechanism according to claim 1, characterized in that, The upper part of the interlocking upper and lower sliding plates is provided with an operating part, which is used to receive external operating force to move it downward.

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