Tension electronic fence alarm system

Abstract

The invention relates to a tension type electronic fence alarm system comprising a plurality of defence zones, an alarm controller and an alarm device. Each defence zone includes a plurality of fencecolumns, a plurality of tension alloy wires arranged at the fence columns, and a tension sensor; and one end of each tension alloy wire is fixedly connected to the fence column at one side and the other end is fixedly installed at the fence column at the other side by the tension sensor. The tension sensors are connected to the alarm controller connected to the alarm device. The alarm controller consists of a first alarm threshold X1, a delay alarm timer T1, a second alarm timer T2, a falling reset threshold R and a second alarm threshold X2. According to the system provided by the invention,a delay alarm method, an adaptive delay alarm method or an oscillation reset alarm method is employed. The system has advantages of reasonable design and simple structure. False alarming caused by natural weather phenomena such as the storm or typhoon can be avoided effectively; and thus a phenomenon that false alarming or missing alarming is caused by reference tension changing is avoided.

Description

technical field [0001] The invention relates to the technical field of safety protection, in particular to a tension type electronic fence alarm system. Background technique [0002] Tension electronic fence alarm system is widely used in schools, oil depots, ammunition depots and other places. Its front-end wire is not charged, and the alarm is realized through the change of tension, which is safer than the high-voltage fence alarm system. Tension electronic fence alarm system usually consists of four parts: tension generator, tension sensor, alarm controller and alarm. Wherein, the tension generator usually includes 4 or 8 tension alloy wires, several tension pulleys, several tension tensioners and several tension springs. Tension generators are usually installed around the walls of residential quarters, courtyards or other areas that require protection. After the installation, the tension alloy wire is in a tensioned state of a certain tension to generate a reference te...

AI Technical Summary

Problems solved by technology

[0003] After the tension type electronic fence alarm system is put into use, as time goes by, the tension alloy wire or tension spring will fatigue and cause the reference tension to become smaller. Tension changes, reference tension changes may lead to false alarms or missed alarms

[0004] The tension type electronic fence alarm system is usually exposed to the outdoor environment. In the event of a storm, especially a typhoon, it will cause a lot of tension and cause false alarms.

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