Safety maintenance power box

Abstract

The utility model discloses a safe maintenance power box, and belongs to the technical field of electric power maintenance. The power box comprises a power inlet wire and a power outlet wire, the power inlet wire is connected with a normally open button SB1, a normally closed button SB2, a travel switch first normally open contact SQ1 and a contactor coil KM in series, and the normally open button SB1 is connected with a first contactor KM1 normally open contact in parallel; a condition allowing indicator lamp, a normally open contact of the second contactor KM2 and a line electrification indicator lamp are respectively connected in series with the power supply incoming line; and all the components are connected with the power supply outgoing line. According to the utility model, the travel switch is additionally arranged in the power box, and the disconnection point design of the travel switch is utilized, so that the problem of power supply mistake caused by misoperation when the cabinet door is opened is effectively avoided, and potential safety hazards are reduced; meanwhile, when the cabinet door is opened, electrified parts in the box can be greatly reduced, personnel are prevented from directly contacting the electrified parts, the electric shock risk is remarkably reduced, and the safety of field personnel is guaranteed. The device is ingenious in structure, simple in wiring and suitable for safe power supply control in an electric power overhaul scene.

Description

Technical Field

[0001] The utility model relates to the technical field of power maintenance, and particularly relates to a safe maintenance power supply box. Background Art

[0002] The cabinet door lock of the traditional power supply box uses a conventional mortise lock. In order to save trouble, maintenance personnel often privately open the upper cabinet door of the maintenance power supply box and operate the air switch of the corresponding socket. Since the internal circuit and the socket power supply are in a powered state after the cabinet door of the power supply box is opened, it is extremely easy for maintenance personnel to touch the live parts inside the box and cause an electric shock accident. Content of the Utility Model

[0003] In view of the above technical problems, the utility model provides a safe maintenance power supply box, which is used to solve the problem that the internal circuit and the socket power supply cannot be self-locked and de-energized after the traditional power supply box is opened.

[0004] In order to achieve the above purpose, the technical solution of the utility model is specifically as follows:

[0005] A safe maintenance power supply box includes a power supply inlet wire and a power supply outlet wire. A normally open button SB1 is connected in series on the power supply inlet wire. The normally open button SB1 is connected in series with a normally closed button SB2. The normally closed button SB2 is connected in series with a first normally open contact SQ1 of a travel switch. The first normally open contact SQ1 of the travel switch is connected in series with a contactor coil KM. The contactor coil KM is connected to the power supply outlet wire. The normally open button SB1 is connected in parallel with a normally open contact KM1 of a first contactor;

[0006] A condition-allowing indicator light is also connected in series on the power supply inlet wire. The condition-allowing indicator light is connected in series with a second normally open contact SQ2 of a travel switch. The second normally open contact SQ2 of the travel switch is connected to the power supply outlet wire;

[0007] A normally open contact KM2 of a second contactor is also connected in series on the power supply inlet wire. The normally open contact KM2 of the second contactor is connected in series with a socket live indicator light. The socket live indicator light is connected to the power supply outlet wire;

[0008] A line live indicator light is also connected in series on the power supply inlet wire. The line live indicator light is connected to the power supply outlet wire.

[0009] Compared with the prior art, the beneficial effect of the utility model is that the structure of the utility model is ingenious and the wiring is simple. By adding a travel switch in the power supply box and creating a disconnection point for the travel switch, it effectively reduces the misoperation during the opening of the cabinet door, resulting in the accidental power supply, thus causing safety problems. And opening the cabinet door of the power supply box will greatly reduce the live positions inside the power supply box, successfully avoiding the direct contact of on-site personnel with the live parts inside the power supply box, reducing the electric shock probability of on-site personnel, and ensuring the safety of on-site personnel. Description of the Drawings

[0010] Figure 1 This is a structural schematic diagram of the present utility model.

[0011] In the figure:

[0012] 1. Power supply incoming line; 2. Power supply outgoing line; 3. Normally open button SB1; 4. Normally closed button SB2; 5. First normally open contact SQ1 of travel switch; 6. Contactor coil KM; 7. Normally open contact 7 of first contactor KM1; 8. Condition-allowed indicator light; 9. Second normally open contact SQ2 of travel switch; 10. Normally open contact 10 of second contactor KM2; 11. Socket live indicator light; 12. Line live indicator light. Specific embodiments

[0013] To make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present utility model. In addition, in the following descriptions, the descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concepts of the present utility model.

[0014] A safety maintenance power supply box includes a power supply incoming line 1 and a power supply outgoing line 2. A normally open button SB13 is connected in series on the power supply incoming line 1. The normally open button SB13 is connected in series with a normally closed button SB24. The normally closed button SB24 is connected in series with a first normally open contact SQ15 of a travel switch. The first normally open contact SQ15 of the travel switch is connected in series with a contactor coil KM6. The contactor coil KM6 is connected to the power supply outgoing line 2. The normally open button SB13 is connected in parallel with a normally open contact 7 of a first contactor KM1;

[0015] A condition-allowed indicator light 8 is also connected in series on the power supply incoming line 1. The condition-allowed indicator light 8 is connected in series with a second normally open contact SQ29 of a travel switch. The second normally open contact SQ29 of the travel switch is connected to the power supply outgoing line 2;

[0016] A normally open contact 10 of a second contactor KM2 is also connected in series on the power supply incoming line 1. The normally open contact 10 of the second contactor KM2 is connected in series with a socket live indicator light 11. The socket live indicator light 11 is connected to the power supply outgoing line 2;

[0017] A line live indicator light 12 is also connected in series on the power supply incoming line 1. The line live indicator light 12 is connected to the power supply outgoing line 2.

[0018] The usage process of the power supply box is as follows. First, connect the upper-level circuit to the power supply box and power on. The live indicator 11 of the socket and the live indicator 12 of the line indicate that power is on. At this time, two situations may occur. The first situation is that when the cabinet door is not closed and the normally open button SB13 is turned to power on, the first normally open contact SQ15 of the travel switch and the second normally open contact SQ29 of the travel switch are disconnected, and the condition-allowed indicator 8 connected thereto does not light up. The normally open contact 7 of the first contactor KM1 does not attract, and the normally open contact 10 of the second contactor KM2 is disconnected. The live indicator 11 of the socket connected thereto does not light up. At this time, the power-on fails and the socket of the power supply box is not powered. The second situation is that when the cabinet door is closed and power is on, when the cabinet door is closed, the first normally open contact SQ15 of the travel switch and the second normally open contact SQ29 of the travel switch are closed, and the condition-allowed indicator 8 lights up, meeting the power-on condition. At this time, turn the normally open button SB13 to power on. The normally open contact 7 of the first contactor KM1 is powered, and at the same time, the normally open contact 10 of the second contactor KM2 is closed, and the live indicator 11 of the socket lights up. At this time, the power-on is successful and the socket of the power supply box is powered. After use, turn the power-off switch, the live indicator 11 of the socket goes out, the socket is powered off, open the cabinet door, the travel switch SQ1 is disconnected, and the condition-allowed indicator 8 goes out.

[0019] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A safety maintenance power supply box, characterized in that: The invention comprises a power supply input line (1) and a power supply output line (2), wherein a normally open button SB1 (3) is connected in series to the power supply input line (1), a normally closed button SB2 (4) is connected in series to the normally open button SB1 (3), a first normally open contact SQ1 (5) of a travel switch is connected in series to the normally closed button SB2 (4), a first normally open contact SQ1 (5) of the travel switch is connected in series to a contactor coil KM (6), the contactor coil KM (6) is connected to the power supply output line (2), and a first normally open contact (7) of the first contactor KM1 is connected in parallel to the normally open button SB1 (3); The power supply line (1) is also connected in series with a conditional permission indicator light (8), the conditional permission indicator light (8) is connected in series with a second normally open contact SQ2 (9) of a travel switch, and the second normally open contact SQ2 (9) of the travel switch is connected to the power supply line (2); The power supply line (1) is also connected in series with a normally open contact (10) of a second contactor KM2, the normally open contact (10) of the second contactor KM2 is connected in series with a socket power indicator (11), and the socket power indicator (11) is connected to the power supply line (2); A line power indicator light (12) is also connected in series to the power inlet line (1), and the line power indicator light (12) is connected to the power outlet line (2).

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