Seismic sensor

Abstract

The invention discloses a seismic sensor, which comprises a fixing frame, a shell, an electric push rod and a main spring, and is characterized in that the shell is fixedly arranged at the deep position of the earth surface and is internally provided with a closed cavity filled with dry nitrogen, the fixing frame is arranged in the shell, and an inner sliding sleeve is arranged in the fixing frameto form a sliding pair, and the inner sliding sleeve can be quickly bounced upwards under the elastic action of the main spring to make a copper plate conduct a left plug and a right plug; a left supporting rod, a right supporting rod, a left pressing plate and a right pressing plate form a rotating pair with the fixing frame respectively; a left heavy block and a right heavy block are suspendedat the outer end of the left supporting rod and the outer end of the right supporting rod respectively; and the left supporting rod and the right supporting rod press the left pressing plate and the right pressing plate through a left adjusting screw and a right adjusting screw respectively under the action of gravity, so that a left friction plate arranged on the left pressing plate and a right friction plate arranged on the right pressing plate tightly press the inner sliding sleeve, the inner sliding sleeve is locked and stopped moving upwards under the action of friction force, and the electric push rod installed at the top end of the fixing frame can push the inner sliding sleeve to move downwards to the initial position where a circuit is disconnected.

Description

technical field [0001] The invention relates to a seismic sensor. Background technique [0002] Earthquakes propagate from the source to the surroundings in the form of waves. The waves generated by earthquakes are called seismic waves. According to the propagation characteristics of seismic waves, seismic waves can be divided into longitudinal waves, transverse waves and surface waves; For the compression wave transmitted outward, the vibration direction of the particle is consistent with the forward direction of the wave. The longitudinal wave can propagate in solids and liquids. The propagation speed of this wave is fast, and the propagation speed in the crust is about 5-6 kilometers per second. , the period of the longitudinal wave is short and the amplitude is small, which can cause the ground to jump up and down; the shear wave (S wave) is a shear wave transmitted from the source, the vibration direction of the particle is perpendicular to the direction of the wave, an...

AI Technical Summary

Problems solved by technology

[0004] Earthquake sensor is an important part of the earthquake early warning system, which requires the first time to detect the longitudinal wave (P wave) generated by the earthquake, and convert the vibration information into an electrical signal, and use the characteristics of the rapid transmission of the electrical signal to issue an earthquake warning in time. It may prolong the golden escape time and save people's lives and properties; the existing seismic sensors mostly use complex circuit equipment composed of sensitive elements, conversion elements, conversion circuits and auxiliary power supplies. The structure and principle are relatively complicated, the manufacturing cost is high, and the reliability is low.

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