Two-level ultralow frequency vibration isolation apparatus based on oblique-pulling spring and flat spring system

Abstract

The invention discloses a two-level ultralow frequency vibration isolation apparatus based on an oblique-pulling spring and a flat spring system and relates to the technical field of absolute gravity measurement. The apparatus is featured in that a pedestal is vertically provided with a column; the top of the column is provided with a spring adjusting screw, and the middle part of the column is provided with an external cross-shape plate spring; the left end of a swing rod is connected with the column through the external cross-shape plate spring; the middle end of the swing rod is connected with the spring adjusting screw through the oblique-pulling spring; a swing rod pedestal is connected under the swing rod and is fixedly provided with the flat spring system; a magnetic cylinder coil is arranged under the right end of the swing rod; the upper end of the flat spring system is a capacitance displacement sensor; and the magnetic cylinder coil, a feedback circuit and the capacitance displacement sensor are connected in sequence. Compared with the prior art, the invention is simple in structure and convenient to operate. By means of the feedback circuit, the equivalent period of the whole apparatus is enabled to be more than several ten seconds, an ideal vibration isolation effect for micro-tremor signals of 3-5s is achieved, and good technical support is provided for high-precision absolute gravity meter development.

Description

technical field [0001] The invention relates to the technical field of absolute gravity measurement, in particular to a two-stage ultra-low frequency vibration isolation device based on a cable-stayed spring and a leaf spring system. Background technique [0002] With the development of modern science, the requirements for absolute gravity measurement accuracy in the fields of aerospace, seismic monitoring, and resource exploration are getting higher and higher, which puts forward higher requirements for observation technology and observation instruments. At present, absolute gravity measurement technology and measurement accuracy are the embodiment of a country's comprehensive industrial foundation and scientific and technological level. This marks that my country has entered a period of strong national support and rapid development in the field of absolute gravimeter research and development. There are many scientific research units engaged in absolute gravimeters in Chin...

AI Technical Summary

Problems solved by technology

However, in absolute gravity measurement, the vibration isolation platform needs to be placed under the falling mechanism, and there are certain requirements for the height and position of the vibration isolation platform, so that it can work normally under the falling mechanism. The height of the secondary spring system is relatively large. The vibration isolation system similar to FG5 has a complex structure and a high failure rate

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