JPH06348971A - Fence outer periphery guarding device - Google Patents

Abstract

PURPOSE:To exactly narrow down an intruded point regardless of installation conditions by providing a detector to be operated when an operation wire is pulled from the outside and performing signal transmission concerning the operation of the detector through an identification wire to a control part while adding the identification signal of its own station. CONSTITUTION:When a sensor wire 2 spread between fences is pulled, an operation wire 2A in it is pulled against the tensile force of a spring 4, thus, the detector is operated, and the information on that purport is transmitted to the control part. Namely, a reed switch 11 at the main body of the sensor is in proximity to a magnet 5 by the elastic force of the spring 4 at normal time, and a contact is closed. When the operation wire 2A is pulled, however, the magnet 5 fitted to a fitting tool 3 gets away by the reed switch 11 to open the contact of the reed switch 11. Then, this signal is detected by a slave station 10 and sent out as a signal while adding the identification signal. At the control part, it is detected which detector is operated and an alarm is issued or a television camera is directed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fence outer periphery warning device for detecting an intrusion into a site from a fence that is stretched around the site and issuing an alarm.

[0002]

2. Description of the Related Art Fences for preventing invasion are stretched around the premises of electric facilities and factories for the purpose of hazard prevention and facility security. Conventionally, various alert devices for detecting an intruder have been installed.

Some security devices use a television camera, but if the fence is long, many television cameras must be provided, and many guards must be provided in the guard room. There is also a cost problem.
There is a monitoring device provided with an infrared sensor, but this is often not applicable because the infrared sensor often malfunctions in a densely built area or a green area.

Further, there is a method of detecting a state where the sensor wire is pulled by pulling a sensor wire. In the conventional method, when a large number of sensors are installed and the installation distance is extended, the alarm position can be accurately known. There was a problem that the entry point could not be narrowed down.

[0005]

The problem to be solved by the present invention is to provide a device capable of accurately narrowing down the intrusion point regardless of the installation condition.

[0006]

In order to solve the above-mentioned problems, a fence outer periphery guard device of the present invention is a sensor main body attached to a support of a fence at predetermined intervals, and a sensor wire stretched between the sensor main bodies. This sensor wire has an operation line and an identification line inside, and a spring that gives tension to the end of the operation line of the sensor wire is provided inside the sensor body, and the operation line is outside. A detector that operates when pulled from is provided, and means for transmitting the operation of this detector to the control unit through the identification line with the identification signal of its own station is provided.

[0007]

[Operation] When the sensor wire stretched between the fences is pulled, the motion line in the fence is pulled against the tension of the spring, which activates the detector and transmits the information to the control unit. . The control unit detects which detector has actuated, issues an alarm, and directs a television camera and lighting to that location to detect an illegal intruder.

[0008]

EXAMPLES The present invention will be specifically described below with reference to examples.

FIG. 1 is a schematic diagram showing the structure of a sensor body according to the present invention. In the figure, 1 is a cylindrical sensor case, 2 is a sensor wire having an operation line 2A and a two-core identification line inside, 3 is a fixture to be attached to the end of the operation line 2A, and 4 is a tension for the operation line 2A. For this purpose, a spring provided between the inner wall of the sensor case 1 and the fixture 3 is a magnet fixed to the fixture 3, 6 is a fixture attached to the end of the operation line 2A of the other sensor wire, 7 Is a spring that gives tension to the operating line 2A, 8 is an input terminal block for connecting the end of the identification line 2B of one of the sensor wires,
Reference numeral 9 is an output terminal block for connecting the end portion of the identification wire 2B of the other sensor wire, and 10 is a child which outputs an identification signal in response to an on / off signal of a reed switch 11 mounted on the sensor case 1 in proximity to the magnet 5. It is a station. The reed switch 11 is normally close to the magnet 5 due to the elastic force of the spring 4, and the contact is closed. However, when the operation line 2A is pulled, the magnet 5 attached to the fixture 3 is removed from the reed switch 11. I'm going away,
The contact of the reed switch 11 is opened. This signal is detected by the slave station 10 and transmitted as a signal.

FIG. 2 shows the sensor bodies S _{11 to} S ₁₁ having the above-mentioned structure.
₁₃ ... and S _{21 to} S ₂₃ ... are the poles P of the fence F
_{1 to} P ₃ ... Is an example attached to the upper part, and 2 ₁₁ to 2 ₁₃ ..., 2 ₂₁ to 2 ₂₃ ... Show sensor wires. Reference numeral 20 is a terminal box, and 21 is a control unit.

FIG. 3 is an electrical connection diagram of a security device using the sensor main body of FIG. 1 and shows a connection state of the identification line 2B and the reed switch 11 to the slave station 10.

FIG. 4 is a block diagram showing the internal configuration of the slave station 10 and the control unit 21, and FIG. 5 is a connection diagram thereof. Figure 6 (a)
5E is a signal waveform at points A to E in FIG.
FIG. 6 (f) is a waveform diagram showing changes in the duty cycle during on / off.

In the slave station 10 of FIG. 4, the voltage detector detects the voltage of the line connected from the slave station at the preceding stage. The input converter converts the on / off state of the input signal 11 into time and sends it to the delay generator. The delay generation unit delays the ON / OFF state time sent from the input conversion unit based on the voltage change timing sent from the voltage detection unit to create a signal, and sends the signal to the voltage control unit. The voltage controller sends the signal sent from the delay generator to the line of the slave station at the next stage. The power supply creating unit creates an operating power supply to be used internally from a line and supplies it.

In the control unit 21 of FIG. 4, a power supply pulse is supplied from the power supply unit to the slave station line. The input signal information pulse from the slave station is superimposed on the line. The voltage detection unit extracts the input signal information pulse, extracts the signal for each slave station at the timing from the timing generation unit, and restores the ON / OFF signal in the signal analysis unit. In the power supply circuit section, the operating voltage of each section is supplied, and the power supply to the slave station is also created.

In each slave station 10, as shown in FIG. 7, when a voltage is applied from the previous stage, _a current is passed for _a time t _a to cause a voltage drop. between t _b is stopped inside the current, it becomes open, increases the voltage drop. After t _b, the voltage to be sent to the next stage is applied. After t _b , it remains open and the IN voltage becomes the OUT voltage. That is, the reed switch 11
The time t _b is changed by changing t _a in the ON / OFF state of.

FIG. 8 is a waveform diagram showing the operation of the control unit 21, in which the voltage is applied to the slave station line. In the part (1), the pulse generated by the slave station 10 is read, and the on / off state is read with each pulse width. Then, the application of the voltage is stopped when the pulse generated by the slave station 10 disappears for a certain period of time.

[0017]

As described above, the present invention has the following effects.

Since the operation wire and the identification wire are provided in the sensor wire extending between the sensor bodies, the intruder can be detected and the signal can be transmitted by one sensor wire.

Even if the sensor wire is cut, the position after the cutting point can be identified. In an environment where the slave station electronics are inoperable, it is also possible to identify the overall position individually monitored by the operating line.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a configuration of a sensor body according to the present invention.

FIG. 2 is a schematic view showing an example in which the sensor body according to the present invention is attached to a pole of a fence.

FIG. 3 is an electrical connection diagram of a warning device using the sensor body according to the present invention.

FIG. 4 is a block diagram showing internal configurations of a slave station and a control unit.

FIG. 5 is a connection diagram of a slave station and a control unit.

FIG. 6 is a signal waveform diagram at each point in FIG.

FIG. 7 is a waveform diagram of IN voltage and OUT voltage for a slave station.

FIG. 8 is an operation waveform diagram of the control unit.

[Explanation of symbols]

1 sensor case, 2 sensor wires, 2A operation line,
2B identification line, 3 attachments, 4 springs, 5 magnets, 6 attachments, 7 springs, 8 input terminal block, 9 output terminal block, 10 slave station, 11 reed switch, 20 terminal box, 21 control section

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Haruichi Fujioka 701-1 Minamikawasaki, Yashio City, Saitama Able Mansion 210

Claims (1)

[Claims] 1. A fence main body is provided with a sensor body attached to a support column at predetermined intervals and a sensor wire stretched between the sensor bodies. The sensor wire has an operation line and an identification line therein. In the sensor body, a spring that gives a tension to the end of the operation line of the sensor wire is provided, and a detector that operates when the operation line is pulled from the outside is provided. Fence perimeter guarding device, which is provided with means for transmitting a signal to the control section through the identification line.