Antitheft sensor for inspection well cover

Abstract

The invention provides an antitheft sensor for an inspection well cover. The antitheft sensor comprises an elastic box. The elastic box is internally provided with an elastic retractable rod which can move up and down. The upper end of the elastic retractable rod protrudes out of the elastic box, and the lower end of the elastic retractable rod is provided with a magnetic element. A Hall proximity switch is arranged in the lower portion of the elastic box, and the magnetic element and the Hall proximity switch are arranged in a spaced mode. The Hall proximity switch is connected with a control circuit board, and the control circuit board is supplied with electricity through a battery. When the elastic retractable rod is pressed downwards by external force, the magnetic element at the lower end gets close to the Hall proximity switch so that the Hall proximity switch can be switched on. The control circuit board comprises a single-chip microcomputer and a radio frequency receiving and sending circuit connected with the single-chip microcomputer. The single-chip microcomputer judges the state of the inspection well cover according to the electrical level of a signal pin of the Hall proximity switch, and when the state of the inspection well cover is abnormal, the single-chip microcomputer controls the radio frequency receiving and sending circuit to wirelessly send the abnormal state of the inspection well cover. The anti-theft sensor is used as a protection device for preventing the inspection well cover from being stolen.

Description

technical field [0001] The invention relates to an alarm device, in particular to a sensor with early warning and alarm when a manhole cover is stolen. Background technique [0002] With the continuous deepening of the urbanization process, the construction of municipal public facilities has developed rapidly. The urban underground pipe network system is more and more developed, which contains tens of thousands of manhole covers. Because inspection well covers are mostly made of cast iron materials, stealing inspection well covers is just profitable in the eyes of many criminals. Once the manhole cover is missing, it will bring serious safety hazards, ranging from car "wheel sinking" and pedestrian injury, to life-threatening manhole falling, and the work of manhole cover anti-theft is urgent. There are three traditional anti-theft methods for manhole covers: [0003] First: Strengthen anti-theft monitoring, increase patrolling efforts, increase personnel input, and mobil...

AI Technical Summary

Problems solved by technology

Not only can thieves easily cut the chains and destroy the locks, but the chains and cables also become the target of thieves

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