Drawer type low voltage distribution cabinet primary plug-in static contact terminal protection cover

Abstract

The utility model discloses a drawer type low voltage distribution cabinet primary plug -in component static contact wiring terminal protection cover of preventing electrified mistake opening, relate wiring terminal protection cover technical field. Its technical scheme is: the top of protection cover body is provided with the limiting plate, and the outside of cabinet back plate corresponds the limiting plate and is provided with the limiting mechanism, and the limiting mechanism includes the mounting seat of setting on the cabinet back plate, and the horizontal channel of setting in the mounting seat is penetrated, and the horizontal channel is provided with the linkage lever, and the middle part of linkage lever is provided with the middle fixed plate, and the both sides of middle fixed plate are respectively provided with the spring on the linkage lever, and one end of two springs is fixed on the middle fixed plate, and the other end is fixed on the both ends of horizontal channel respectively, limiting hole is set up on the limiting plate corresponding linkage lever, and when the spring away from the cabinet back plate is in compression state, linkage lever inserts into the limiting hole. The utility model discloses the protection cover body of forced locking electrified state, and the safety of drawer type low voltage distribution cabinet has been improved.

Description

Technical Field

[0001] This utility model relates to the technical field of terminal block protective covers, specifically to a drawer-type low-voltage distribution cabinet primary plug-in static contact terminal block protective cover to prevent accidental opening while energized. Background Technology

[0002] The existing traditional drawer-type low-voltage distribution cabinet's primary plug-in static contact terminal protection cover is merely a cover over the terminal block, which poses a risk of protection failure when reagents are used: the traditional protective cover lacks a dynamic interlocking structure corresponding to the drawer position, which means that the protective cover can still be manually opened when the drawer is energized, thus posing a risk of electric shock or phase-to-phase short circuit.

[0003] In low-voltage power distribution systems, drawer-type switchgear is widely used due to its modularity and ease of maintenance. Each drawer unit represents an independent power supply circuit or control circuit, facilitating isolation, maintenance, and replacement. Inside these drawer units, the stationary contact terminals of the primary plug-in (i.e., the main circuit connector) are critical points for current input. To protect these terminals from dust and foreign objects, and to prevent unauthorized personnel from accidentally touching live parts, a simple protective cover is usually installed.

[0004] However, traditional protective covers are often just a very basic protective measure. They are typically just a cover made of plastic or insulating material, roughly matching the shape of the terminal area, attached to the outside of the terminals via simple hooks, slides, or simply by gravity. Their main function is to provide a physical barrier, blocking large dust particles and visible foreign objects. The core flaw of this design is the lack of a dynamic interlocking mechanism corresponding to the drawer's position, allowing the protective cover to be manually opened even when the drawer is energized, thus posing a risk of electric shock or phase-to-phase short circuit.

[0005] When an electrician needs to maintain, tighten, clean, or replace components on the terminals, the standard operating procedure should be: first, switch the drawer unit from the "Connected / Connected Ready" state to the "Test" state, and then switch it to the "Disconnected / Isolated" state. In the "Disconnected" state, the main circuit of the drawer unit is theoretically isolated, and the terminals should be de-energized. It is safe to operate with the protective cover open at this time. However, because traditional protective covers lack interlocking, even if the drawer unit is still in the "Connected" or "Test" state (when the stationary contact terminals are energized), the operator may manually open the protective cover to check internal wiring, adjust a component, or simply out of habit. Once the protective cover is opened, the energized stationary contacts are completely exposed to the operator. If the operator's hand or tools accidentally come into contact with these exposed energized terminals, a serious electric shock accident can occur instantly, potentially causing injury or death.

[0006] Furthermore, opening the protective cover not only poses a risk of electric shock to the human body, but also greatly increases the risk of phase-to-phase short circuits caused by accidentally falling tools or foreign objects. Distribution cabinets typically have multiple phases (e.g., three phases A, B, and C), which are tightly arranged in a confined space. If a metal tool, a screw, or other conductive object falls between phases after the protective cover is opened, it will cause a phase-to-phase short circuit. A short circuit occurring while the circuit is energized will generate a massive electric arc instantly, potentially melting metal components, causing a fire, damaging the entire distribution cabinet, and even affecting the stable operation of the power grid.

[0007] Therefore, in order to improve the safety of drawer-type low-voltage distribution cabinets, it is essential to upgrade and transform this traditional static protective cover by introducing a dynamic interlocking structure that is strongly correlated with the position of the drawer. This ensures a mandatory logical relationship between "safe power off" and "protective cover closed" or "protective cover cannot be opened," thereby truly achieving safety protection. Utility Model Content

[0008] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a protective cover for the primary plug-in static contact terminal of a drawer-type low-voltage distribution cabinet to prevent accidental opening while energized. By driving the linkage rod of the drawer position limit mechanism, one end of the rod is inserted into the limit hole of the limit plate on the top of the protective cover body, thereby forcibly locking the protective cover body in the energized state and improving the safety of the drawer-type low-voltage distribution cabinet.

[0009] The technical solution of this utility model is as follows:

[0010] A protective cover for the primary plug-in static contact terminals of a drawer-type low-voltage distribution cabinet to prevent accidental opening while energized includes a protective cover body, which is mounted on the rear panel of the low-voltage distribution cabinet and covers the terminals. A limit plate is installed on the top of the protective cover body, and a limit mechanism is installed on the outer side of the rear panel corresponding to the limit plate. The limit mechanism includes a mounting base on the rear panel, with a horizontal channel running through the mounting base. A linkage rod is installed within the horizontal channel, and a middle fixing plate is installed in the middle of the linkage rod. Springs are respectively fitted on both sides of the linkage rod at the middle fixing plate, with one end of each spring fixed to the middle fixing plate and the other ends fixed to the two ends of the horizontal channel. Limit holes are provided on the limit plate corresponding to the linkage rod. When the spring furthest from the rear panel is compressed, the linkage rod is inserted into the limit hole; when the spring is in its uncompressed state, the end of the linkage rod closest to the rear panel extends out of the horizontal channel, and the other end is pulled out of the limit hole.

[0011] Preferably, an end fixing plate is fixed at one end of the horizontal channel near the rear panel of the cabinet, and one end of the spring near the rear panel of the cabinet is fixed on the end fixing plate.

[0012] Preferably, the mounting base is fixed to the rear panel of the cabinet by screws.

[0013] Preferably, the protective cover body is equipped with a controller and three electromagnetic induction sensors, the three electromagnetic induction sensors correspond to phases A, B and C of the wiring terminals respectively and are spaced apart from phases A, B and C; the protective cover body is equipped with three LED lights, which are red, yellow and green respectively when lit, and correspond to phases A, B and C respectively; the electromagnetic induction sensors and LED lights are all connected to the controller through wires.

[0014] Preferably, the distance between the three electromagnetic induction sensors and phases A, B, and C is 8-12 mm.

[0015] Preferably, the protective cover body is provided with a hook, and the back panel of the cabinet is provided with a groove, and the hook is inserted into the groove so that the protective cover body is hung on the back panel of the cabinet.

[0016] Compared with the prior art, this utility model has the following advantages:

[0017] 1. The present invention relates to a protective cover for the primary plug-in static contact terminals of a drawer-type low-voltage distribution cabinet to prevent accidental opening while energized. By improving the structure of the traditional protective cover, a limiting plate with a limiting hole is set on the top of the protective cover body. The linkage rod of the limiting mechanism is driven by the drawer position, so that one end of the rod is inserted into the limiting hole, thereby forcibly locking the protective cover body in the energized state, thus improving the safety of the drawer-type low-voltage distribution cabinet.

[0018] 2. This utility model incorporates a controller and three electromagnetic induction sensors within the protective cover, and three LED lights outside the protective cover to synchronize energization indication with mechanical interlocking status, forming a dual guarantee and further ensuring operational safety. Furthermore, it displays the energization status of the three-phase terminals in real time without contact, facilitating quick judgment by operators and reducing pre-operation confirmation procedures. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the protective cover for the primary plug-in static contact terminal of the drawer-type low-voltage distribution cabinet, which is designed to prevent accidental opening while energized, in a forced-locked state.

[0020] Figure 2 This is a schematic diagram of the limiting mechanism of this utility model in the unlocked state.

[0021] Figure 3 This is a schematic diagram of the limiting mechanism of this utility model in the forced locking state.

[0022] Figure 4 This is a schematic diagram of the electromagnetic induction sensor, controller, and LED light of this utility model.

[0023] In the diagram, 1. Protective cover body; 2. Cabinet back panel; 3. Wiring terminal; 4. Limit plate; 5. Limiting mechanism; 501. Mounting base; 5011. Horizontal channel; 502. Linkage rod; 503. Middle section fixing plate; 504. Spring 1; 505. Spring 2; 506. End fixing plate; 6. Screw; 7. Controller; 8. Electromagnetic induction sensor; 9. LED light. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model.

[0025] Example 1

[0026] like Figure 1 As shown, this embodiment provides a protective cover for the primary plug-in static contact terminals of a drawer-type low-voltage distribution cabinet to prevent accidental opening while energized. The cover includes a protective cover body 1 with hooks. A groove is provided on the rear panel 2 of the low-voltage distribution cabinet. The hooks are inserted into the grooves, allowing the protective cover body 1 to hang on the rear panel 2 and cover the terminals 3. A limit plate 4 is provided at the top of the protective cover body 1, and a limit mechanism 5 is provided on the outer side of the rear panel 2 corresponding to the limit plate 4. Through the cooperation of the limit mechanism 5 and the limit plate 4, the terminals 3 are prevented from being accidentally opened while energized. Specifically:

[0027] like Figure 2As shown, the limiting mechanism 5 includes a T-shaped mounting base 501 fixed to the outside of the cabinet rear panel 2 by screws 6. A horizontal channel 5011 is provided through the mounting base 501. A linkage rod 502 is provided in the horizontal channel 5011. A middle fixing plate 503 is provided in the middle of the linkage rod 502. An end fixing plate 506 is fixed to one end of the horizontal channel 5011 near the cabinet rear panel 2. Spring 1 504 and spring 2 505 are respectively sleeved on both sides of the linkage rod 502 located on the middle fixing plate 503, with spring 1 504 near the cabinet rear panel 2. One end of each spring is fixed to the middle fixing plate 503, the other end of spring 1 504 is fixed to the end fixing plate 506, and the other end of spring 2 505 is fixed to the front end of the horizontal channel 5011. Figure 1 As shown, a limiting hole is provided on the limiting plate 4 at the position corresponding to the linkage rod 502. When the spring 505 is in the compressed state, the linkage rod 502 is inserted into the limiting hole; as Figure 3 As shown, when both spring 1 504 and spring 2 505 are in their natural state, one end of the linkage rod 502 near the back panel 2 extends out of the horizontal channel 5011, and the other end is pulled out from the limiting hole.

[0028] Working principle:

[0029] When the drawer of the drawer-type low-voltage distribution cabinet is pushed into the working position, its front end presses forward against the linkage rod 502. The linkage rod 502 moves to the right within the horizontal channel 5011, thereby stretching spring 504 and compressing spring 505. The end of the linkage rod 502 inserts into the limiting hole, preventing the protective cover body 1 hanging on the back panel 2 of the cabinet from being moved upwards and removed by the operator when the low-voltage distribution cabinet is in the energized working state, thus achieving forced locking of the protective cover body 1. When the drawer is pulled out to the non-working position, spring 504 returns to its original position, spring 505 extends, and the linkage rod 502 moves to the left and exits the limiting hole, allowing the operator to move the protective cover body 1 upwards and remove it when the low-voltage distribution cabinet is not in the energized working state. At this time, the protective cover body 1 is in the unlocked state. Therefore, the protective cover of this embodiment has the characteristics of being detachable and maintainable and having high reliability.

[0030] Example 2

[0031] Based on Example 1, such as Figure 4 As shown, the protective cover body 1 is equipped with a controller 7 and three electromagnetic induction sensors 8. The three electromagnetic induction sensors 8 correspond to phases A, B and C of the wiring terminal 3 respectively, and there is a 10mm gap between them and phases A, B and C. The protective cover body 1 is equipped with three LED lights 9, which are red, yellow and green respectively when lit, and correspond to phases A, B and C respectively. The electromagnetic induction sensors 8 and LED lights 9 are all connected to the controller 7 through wires.

[0032] As described in Example 1, when the protective cover body 1 is in a forced locked state, the electromagnetic induction sensor 8 senses the three-phase electrical signal of the terminal 3. After processing by the controller 7, it drives the three LED lights 9 to stay on, indicating that the power is on. When the protective cover body 1 is in an unlocked state, the electromagnetic induction sensor 8 has no sensing signal, and the three LED lights 9 are off, indicating that the power is off. Similarly, when a phase is de-energized, its corresponding LED light 9 is off.

[0033] This embodiment synchronizes the live indication with the mechanical locking state, further ensuring operational safety. When the three LED lights 9 are constantly lit, it indicates that the protective cover body 1 is in a forced locking state and cannot be opened, thus forming a double protection together with the limit mechanism 5.

Claims

1. A protective cover for the primary plug-in stationary contact terminals of a drawer-type low-voltage distribution cabinet to prevent accidental opening while energized, comprising a protective cover body (1), the protective cover body (1) being hung on the rear panel (2) of the low-voltage distribution cabinet, and the protective cover body (1) covering the terminals (3); characterized in that, A limit plate (4) is provided on the top of the protective cover body (1), and a limit mechanism (5) is provided on the outer side of the cabinet rear panel (2) corresponding to the limit plate (4). The limit mechanism (5) includes a mounting base (501) provided on the cabinet rear panel (2). A horizontal channel (5011) is provided through the mounting base (501). A linkage rod (502) is provided in the horizontal channel (5011). A middle section fixing plate (503) is provided in the middle of the linkage rod (502). The linkage rod (502) is located on the middle section fixing plate (5011). 3) Springs are respectively fitted on both sides, and one end of each spring is fixed on the middle fixing plate (503), and the other end is fixed on both ends of the horizontal channel (5011); the limiting plate (4) is provided with a limiting hole corresponding to the linkage rod (502). When the spring away from the cabinet back plate (2) is in the compressed state, the linkage rod (502) is inserted into the limiting hole; when the spring is in the natural state, the end of the linkage rod (502) close to the cabinet back plate (2) extends out of the horizontal channel (5011), and the other end is pulled out from the limiting hole.

2. The protective cover for the primary plug-in stationary contact terminals of a drawer-type low-voltage distribution cabinet as described in claim 1 to prevent accidental opening while energized, characterized in that... An end fixing plate (506) is fixed at one end of the horizontal channel (5011) near the rear panel (2), and one end of the spring near the rear panel (2) is fixed on the end fixing plate (506).

3. The protective cover for the primary plug-in stationary contact terminals of a drawer-type low-voltage distribution cabinet as described in claim 1 to prevent accidental opening while energized, characterized in that... The mounting base (501) is fixed to the rear panel (2) of the cabinet by screws (6).

4. The protective cover for the primary plug-in stationary contact terminals of a drawer-type low-voltage distribution cabinet as described in claim 1 to prevent accidental opening while energized, characterized in that... The protective cover body (1) is equipped with a controller (7) and three electromagnetic induction sensors (8). The three electromagnetic induction sensors (8) correspond to phases A, B and C of the wiring terminal (3) respectively and are spaced apart from phases A, B and C. The protective cover body (1) is equipped with three LED lights (9), which are red, yellow and green respectively when lit, and correspond to phases A, B and C respectively. The electromagnetic induction sensors (8) and LED lights (9) are connected to the controller (7) through wires.

5. The protective cover for the primary plug-in stationary contact terminals of a drawer-type low-voltage distribution cabinet as described in claim 4 to prevent accidental opening while energized, characterized in that... The distance between the three electromagnetic induction sensors (8) and phases A, B and C is 8-12 mm.

6. The protective cover for the primary plug-in stationary contact terminals of a drawer-type low-voltage distribution cabinet as described in claim 1 to prevent accidental opening while energized, characterized in that... The protective cover body (1) is provided with a hook, and the cabinet back plate (2) is provided with a groove. The hook is inserted into the groove so that the protective cover body (1) is hung on the cabinet back plate (2).

Images