CN2241346Y

CN2241346Y - Advanced alarm device for seism

Info

Publication number: CN2241346Y
Application number: CN 95203129
Authority: CN
Inventors: 于舒龙
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-02-20
Filing date: 1995-02-20
Publication date: 1996-11-27
Anticipated expiration: 2005-02-20

Abstract

The utility model discloses an advanced alarm device for earthquakes. An inducting coil which is arranged in a machine casing is connected with a circuit which is composed of an operational amplification device, a sensitivity adjusting device, a voltage comparator, a switch circuit, an acoustic-optic alarm and a power supply. The upper surface of the inducting coil is provided with a magnetic steel which is suspended on the machine casing through a tension spring. The utility model utilizes the time difference of the earthquake wave and the transverse wave to accurately measure longitudinal wave signals and alarm, providing people with the time of 30 seconds to take safety measures.

Description

Earthquake shifts to an earlier date alarm

The utility model relates to a kind of seismic monitoring device.

Earthquake is the great disaster of a kind of destructiveness, is the formidable enemy of human survival.The method of the present earthquake that also do not forecast with unerring accuracy.Produce two kinds of ripples when earthquake takes place: a kind of is compressional wave, spreads out of with prestissimo from the earthquake centre, general destructive little; Another kind is a shear wave, and about slow 30 seconds, its impulsive force has destructiveness more greatly than compressional wave.

The purpose of this utility model is to utilize compressional wave and shear wave mistiming, detects the compressional wave signal, takes safety measures for people provide the time about 30 seconds.

The technical solution of the utility model is as follows:

The inductive coil that is installed in the casing connects a circuit of being made up of operational amplifier, sensitivity adjustment device, voltage comparator, on-off circuit, audible-visual annunciator and power supply; On inductive coil, there is a magnet steel to be lifted on the casing by extension spring.

The utility model has the advantages that to compressional wave detect highly sensitive, can send sound and optic signal simultaneously during warning.And non-seismic signal had certain interference free performance.

Below knot figure accompanying drawing further specify;

Fig. 1 earthquake shifts to an earlier date the alarm block scheme;

Fig. 2 earthquake shifts to an earlier date the alarm circuit schematic diagram.

Primary wave sensor is that the good extension spring of an elasticity is installed in casing in the drawings, hangs the magnet steel of the constant weight that one and tension spring tension be complementary below the extension spring.Be fixed on inductive coil L in the casing one of magnet steel underneath, when the earthquake generation is trembled, because the elastic buffer effect of extension spring, be hung in magnet steel motion delay below the extension spring in longitudinal wave motion, at this moment can regard magnet steel as transfixion, but inductive coil L and compressional wave are synchronized with the movement magnet steel and coil L generation relative motion this moment, coil L produces induced voltage, and this voltage signal is through C ₁, R ₁Be coupled to operational amplifier N ₁In-phase input end is by R ₂, R ₃, R ₄, C ₂, C ₃Constitute low-pass filter, purpose is to eliminate high-frequency signal to disturb N ₁Passing through C after the signal amplification ₄, R ₅Adjustable, use R ₆Adjust negative feedback depth, determine that according to actual conditions alarming value is located at the several years (seismic intensity), N ₂Output signal directly is coupled and gives amplifier N ₃In-phase input end and N ₄Inverting input, N ₃And N ₄Constitute voltage comparator, work as N ₃, N ₄When the amplifying signal amplitude reaches certain setting amplitude, N ₃And N ₄By isolating diode VD ₁, VD ₂Output signal voltage, signal voltage is through R ₁₁, C ₆Constitute integrating circuit, the instantaneous interference target signal filter is fallen, on-off circuit is by V ₁, R ₁₂, V ₂, R ₃Form, at ordinary times V ₁, V ₂All be in cut-off state, V when having only the seismic signal input ₁And V ₂Just conducting, V ₁, V ₂After the conducting, positive source is through V ₂The emitter input, collector output is given the power supply of news Chinese percussion instrument, simultaneously light emitting diode VD ₃Luminous, send sound, light warning, C ₇, C ₈Effect is decoupling, light emitting diode VD ₄It is the work indication.

In actual applications, more perfect as the need performance, can establish a delay function at circuit, in order to avoid shock sensor partly sends chimes of doom when start.

The present invention is owing to adopt the compressional wave signal alarm, and before shear wave arrives in this time in 30 second, people can in time hide under the firm veil such as table, cabinet, or door and window, run away to spacious place, with the attenuating injures and deaths.The present invention and other invention relatively have highly sensitive characteristics, owing to adopt electronic switching circuit and adopt mechanical contact relatively to have the reliability height, do not have the contact problem of poor, make the complete machine long service life.The present invention is more highly sensitive than shear wave to compressional wave from structure, has improved the anti-interference of non-seismic event like this.Aspect circuit, also taked interference protection measure, partly adopted the logical amplification of low-frequency band, adopted integrating circuit, all increased to non-seismic signal is anti-interference like this at the voltage comparator output as amplifier.Another characteristics of the present invention are that can to distinguish be that real earthquake alerting signal also is non-earthquake alarm signal, if earthquake takes place, and vibration continuously always, sound and light alarm partial continuous warning like this.If be that non-seismic event produces vibration, just rung one it very very briefly.

Claims

1, a kind of earthquake shifts to an earlier date alarm, the inductive coil L that is installed in the casing connects a circuit of being made up of operational amplifier, sensitivity adjustment device, voltage comparator, on-off circuit, audible-visual annunciator and power supply, it is characterized in that: have a magnet steel to be lifted on the casing by extension spring on inductive coil L.