Intrinsically safe vibration sensor for mine

Abstract

Disclosed is an intrinsically safe vibration sensor for a mine. The sensor includes a sensor shell, a magnetic base, a piezoelectric crystal sensor and a circuit board. The sensor shell is an integrally formed cylinder. The bottom of the sensor shell is a back cover base. The middle of the bottom of the back cover base is provided with a threaded groove. The middle of the magnetic seat is providedwith a threaded column. The sensor shell is connected to the magnetic seat through the threaded groove and the threaded column and by gluing. The inner side of the upper part of the sensor shell is fixedly connected to two copper terminals through epoxy resin, and the inner wall of the upper part is fixedly connected to a connection key parallel to the terminals. The outer side of the upper partof the sensor shell is provided with an external thread. The piezoelectric crystal sensor is fixed to the bottom of the inside of the sensor shell. The vibration sensor shell of the invention is integrally formed and is connected to the magnetic seat through the thread and gluing, and so the stability is good during use. The design of the magnetic seat eliminates the need for a complex disassemblytool during measurement, and so the use of the sensor is convenient and fast. The sensor increases charge amplification times for low-frequency small signals and effectively improves the signal intensity.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to an intrinsically safe vibration sensor for mines. Background technique [0002] At present, in domestic mines, all kinds of mechanical accidents are the main reason for the low operating rate of comprehensive large-scale units, and accidents such as coal mine transport machines, ventilators, hoists, and shearers account for more than 1 / 3 of the total accidents. It can be seen that one of the key measures to ensure high coal production is to grasp the operating conditions of machinery in time, realize preventive maintenance and repair, and ensure that the equipment is in good working condition. As far as vibration sensors are concerned, mine intrinsically safe vibration sensors are mostly modified from ordinary IEPE sensors, which are not suitable for complex special occasions in coal mines. Intrinsically safe vibration sensors are mostly designed with piezoelectric crystals, alth...

AI Technical Summary

Problems solved by technology

It can be seen that one of the key measures to ensure high coal production is to grasp the operating conditions of machinery in time, realize preventive maintenance and repair, and ensure that the equipment is in good working condition. As far as vibration sensors are concerned, mine intrinsically safe vibration sensors are mostly modified from ordinary IEPE sensors, which are not suitable for complex special occasions in coal mines. Intrinsically safe vibration sensors are mostly designed with piezoelectric crystals, although they have a higher Wide frequency response range, but the response to low frequency characteristics is poor, so the applicability to the special and complex environment of coal mines is poor, and the low frequency signal strength needs to be improved, and the contact vibration sensor needs to be tested when it is installed in the complex environment under the mine. A special fixture is set on the machine, and it is fixed with the machine through mechanical threads or stress glue, which limits the flexible use of the sensor, and the larger sensor is inconvenient to stick or install

Images