CN207281951U - A kind of cable theft-prevention case - Google Patents

Abstract

The utility model discloses a cable anti-theft box, which comprises a box body, a plurality of cables and an anti-theft alarm. Switches, multiple relay coils and multiple terminals, a leakage switch, a relay coil and a terminal are connected in series to the power supply end to form a power supply circuit; One end is connected, and the second end of the two strands of wires is connected to a terminal, and the leakage switch, the relay coil and the cable connected to the terminal are connected in series to form a cable loop; the anti-theft alarm is connected in parallel with the cable loop to prevent theft. The alarm is connected to the power supply end to form an alarm circuit; the normally closed contacts of the relay are connected in series on the anti-theft alarm; when the cable is damaged, it can alarm in time, and can quickly judge the cable outlet accident, and promptly remind the on-duty personnel to take anti-theft measures , to ensure the safety of the cable.

Description

A cable anti-theft box

technical field

The utility model relates to the field of power cable anti-theft technology, in particular to a novel cable anti-theft box.

Background technique

With the rapid development of urban distribution network construction, the number of power cables used is increasing, especially in low-voltage lines, almost all of which are cable lines. Due to its low voltage level (AC 220,380V) and high wire value (usually copper core), the low-voltage cable line has become the target of some criminals. However, with the development of the construction progress, the low-voltage cable laying process cannot be completed in one day, and even if the laying is completed, it cannot be powered on immediately. This just gives some unscrupulous elements an opportunity to steal crazily the dead high and low voltage power cables that have been laid while the construction workers are not on-site during the construction interruption time. Due to the intricate routing of the low-voltage power cable network and the large number of cables, it will take a lot of manpower and material resources to send special personnel to guard, and the effect will be negligible.

Combined with the on-site construction situation, we need a safe, reliable, economical and practical tool to assist the on-duty personnel. When the cable is damaged, it can call the police in time, and can quickly determine which cable has an accident, so that the on-duty personnel can quickly Go to the break to check.

Utility model content

The purpose of this utility model is to provide a cable anti-theft box, which can alarm in time when the cable is damaged, and can quickly determine which cable has an accident, and remind the on-duty personnel to take anti-theft measures in time to ensure the safety of the cable.

The technical scheme that the utility model adopts is:

A cable anti-theft box, including a box body, a plurality of cables and an anti-theft alarm. The box body is provided with a box door, and a plurality of rows of chutes are arranged in the box body, and a plurality of leakage switches and a plurality of relays are stuck on the chute. A coil and multiple terminals, a leakage switch, a relay coil and a terminal are connected in series to the power supply end to form a power supply circuit; each cable includes multiple strands of wires, which are A-share, B-share, C-share... , and set the first end of the corresponding strand as the X1 end, and the second end as the X2 end, select any two strands of the first end of the wire to connect, the second end of the two strands of wire is connected to a terminal, leakage switch, relay The coil and the cable connected to the terminal are connected in series to form a cable loop; the anti-theft alarm is connected in parallel with the cable loop, and the anti-theft alarm is connected to the power supply end to form an alarm loop; the normally closed contacts of the relay are connected in series on the anti-theft alarm .

The anti-theft alarm includes an indicator light and a buzzer, and the indicator light and the buzzer are connected in series in the alarm circuit after they are connected in parallel.

The normally closed contact of the relay includes a first normally closed contact and a second normally closed contact, the first normally closed contact of the relay is connected in series with the indicator light, and the second normally closed contact of the relay is connected in series with the buzzer.

The said indicator light is arranged on the box door, and the buzzer is arranged on the box door.

The chute is provided with three rows, a plurality of earth leakage switches are placed in the first row, a plurality of relay coils are placed in the second row, and a plurality of connection terminals are placed in the third row.

The utility model uses the box body as a carrier, and a plurality of rows of chutes are arranged in the box body. A plurality of leakage switches, a plurality of relay coils and a plurality of connection terminals are stuck on the chute. First, a leakage switch, a relay coil and a The terminals are connected in series to the power supply end to form a power supply loop to supply power to the components in the box; when the cable is connected to the terminal, the leakage switch, the relay coil and the cable connected to the terminal are connected in series to form a cable loop , the cable is a part of the circuit, which is equivalent to the on-off switch of the circuit. When the cable is cut off by man-made theft, the cable circuit is de-energized, the relay coil is de-energized, and the first normally closed contact and the second normally closed contact of the relay In the closed state, at this time, the anti-theft alarm is equivalent to a conductive circuit, the external mains voltage supplies power to the anti-theft alarm, and the anti-theft alarm acts to give a corresponding alarm. The personnel on duty can find out which cable has a problem in time, check and deal with it in time to prevent theft.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the schematic circuit diagram of the utility model.

Detailed ways

As shown in Fig. 1 and Fig. 2, the utility model comprises box body 1, many cables 2 and anti-theft alarm, box body 1 is provided with box door 3, box body 1 comprises cubic box body, and the top of box body is The ridge-type box roof prevents rainwater from accumulating and immersing into the inside of the box body 1 to damage components, and the box door 3 is arranged on the front side of the box body. There are multiple rows of chutes 4 inside the box body 1, and multiple leakage switches 5, multiple relay coils 6 and multiple terminals 7 are stuck on the chute 4; there are three rows of chutes 4, and multiple rows are placed in the first row. Leakage switch 5, a plurality of relay coils 6 are placed in the second row, and a plurality of connection terminals 7 are placed in the third row. A leakage switch 5, a relay coil 6 and a connection terminal 7 are connected in series to the power supply end to form a power supply circuit.

Each cable 2 includes multiple strands of conductors, which are respectively A strands, B strands, and C strands..., and the _first end of the corresponding strands is set as X1 end, and the _second end is X2 end, and any two strands of wires are selected. The first end is connected, and the second end of these two wires is connected on a terminal 7, and the leakage switch 5, the relay coil 6 and the cable 2 connected to the terminal 7 are connected in series to form a cable loop; the anti-theft alarm It is connected in parallel with the cable circuit, and the anti-theft alarm is connected to the power supply end to form an alarm circuit; the normally closed contacts of the relay are connected in series on the anti-theft alarm.

The anti-theft alarm includes an indicator light 8 and a buzzer 9, and the indicator light 8 and the buzzer 9 are connected in series in the alarm loop after they are connected in parallel; the normally closed contacts of the relays include the first normally closed contacts 10 and The second normally closed contact 11, the first normally closed contact 10 of the relay is connected in series with the indicator light 8, the second normally closed contact 11 of the relay is connected in series with the buzzer 9; the indicator light 8 is arranged on the box door 3, arranged A row is arranged, echoes with corresponding cable circuit, and buzzer 9 is arranged on the box door 3.

The working principle of the present utility model is illustrated below in conjunction with accompanying drawing.

Example

During the laying of the cable 2, one end of the cable 2 is set in the power distribution room as the first end of the cable 2, and the other end of the cable 2 is set in the box 1 as the second end, and each cable 2 is connected to the The leakage switch 5 and the relay coil 6 are connected in series to form a cable loop. If the cable 2 is a high-voltage cable 2, each high-voltage cable 2 includes three strands of wires, which are A strands, B strands, and C strands, and the first strand is set as the first strand. The end is A ₁ end, the second end is A ₂ end, the first end of the second strand is B ₁ end, the second end is B ₂ end, the first end of the third strand is C ₁ end, the second end is C ₂ end, if you choose the first end of A-share and B-share to connect, that is, A ₁ -end and B ₁ -end are connected, and the second end of A-share and B-share, A ₂ and B ₂ , are connected to a terminal 7, at this time, a relay coil 6 connected in series with the cable 2 and a leakage switch 5 are connected in series to form a cable loop, and the anti-theft alarm is connected in parallel with the cable loop, and the anti-theft alarm is connected to the power supply end to form an alarm loop; All cables 2 are connected in the above-mentioned manner, and after connection, each cable 2 forms an independent alarm circuit.

When the thief does not steal the cable 2, the cable 2 is equivalent to a complete wire, which is equivalent to the cable loop is turned on and is in a closed state, forming a loop with the neutral line shorted. The external mains voltage is the cable loop in the box 1. Power is supplied, and the relay coil 6 is energized, and the first normally closed contact 10 and the second normally closed contact 11 of the relay are in the disconnected state. At this moment, the anti-theft alarm is equivalent to an open circuit and does not report to the police.

When the thief steals the cable 2, the cable 2 is equivalent to a cut-off wire, which is equivalent to that the cable loop is not conducting, and is in an open circuit state, and cannot form a loop. The relay coil 6 loses power, and the first normally closed contact 10 of the relay and The second normally closed contact 11 is in a closed state. At this moment, the anti-theft alarm is equivalent to a conducting circuit, and the external mains voltage supplies power to the anti-theft alarm, and the anti-theft alarm acts to give a corresponding alarm. For example, when No. 1 cable 2 is disconnected, No. 1 indicator light 8 is lit. The personnel on duty can promptly find out which cable 2 has a problem, check and deal with it in time to prevent theft.

It should be noted that at last: the above embodiment is only in order to illustrate the technical scheme of the present utility model, and is not intended to limit it; Although the utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention. scope.

Claims (5)

1. A cable anti-theft box, characterized in that: it comprises a box body, a plurality of cables and an anti-theft alarm, the box body is provided with a box door, the box body is provided with multiple rows of chutes, and the chute is provided with multiple A leakage switch, a plurality of relay coils and a plurality of terminals, a leakage switch, a relay coil and a terminal are connected in series to the power supply end to form a power supply circuit; each cable includes multiple wires, which are A-share, B strand, C strand...N strand, and the first end of the corresponding strand is X ₁ end, and the second end is X ₂ end, choose the first end of any two wires to connect, and the second end of the two wires to connect On a connection terminal, the leakage switch, the relay coil and the cable connected to the connection terminal are connected in series to form a cable loop; the anti-theft alarm is connected in parallel with the cable loop, and the anti-theft alarm is connected to the power supply end to form an alarm loop; the relay often The closing contact is connected in series on the anti-theft alarm. 2. The cable anti-theft box according to claim 1, characterized in that: the anti-theft alarm includes an indicator light and a buzzer, and the indicator light and the buzzer are connected in series in the alarm circuit after they are connected in parallel. 3. The cable anti-theft box according to claim 2, characterized in that: the normally closed contact of the relay comprises a first normally closed contact and a second normally closed contact, and the first normally closed contact of the relay is connected with the indicating The lights are connected in series, and the second normally closed contact of the relay is connected in series with the buzzer. 4. The cable anti-theft box according to claim 3, characterized in that: said indicator light is set on the box door, and the buzzer is set on the box door. 5. The cable anti-theft box according to claim 1, characterized in that: the chute is provided with three rows, a plurality of leakage switches are placed in the first row, a plurality of relay coils are placed in the second row, and a plurality of relay coils are placed in the third row. Terminals.