Portable dust monitor

Abstract

The invention discloses a portable dust monitor. A main air inlet and a main air outlet are formed in a small shell. A partition plate and a temperature and humidity sensor are installed in an inner cavity of the temperature and humidity measuring box. A strip-shaped communicating hole is formed in the middle of the partition plate. The outer side of the temperature and humidity measuring box is connected with a first air inlet pipeline, a first air outlet pipeline, a second air outlet pipeline and a third air outlet pipeline. An air outlet and an air inlet of the dust meter are respectively connected with the air outlet ends of the first air inlet pipeline and the drying pipeline; the air inlet end of the drying pipeline is connected with the main air inlet; air inlets of the pulsation damper, the third air outlet pipeline and the vacuum sampling pump are respectively connected with three interfaces of the first three-way pipe fitting; an air outlet of the vacuum sampling pump is connected with the main exhaust port; and the environment pressure sensor, the second air outlet pipeline and a second air inlet of the differential pressure type flow meter are connected with one outlet of the second three-way pipe fitting, and a first air inlet of the differential pressure type flow meter is connected with the first air outlet pipeline. The monitor is convenient to carry and can ensure the credibility of a detection result.

Description

technical field [0001] The invention belongs to the technical field of dust measurement, and in particular relates to a portable dust monitor. Background technique [0002] There is a large amount of dust in most coal mine roadways, coal mining faces and ground tunnel excavation faces, among which the concentration of respirable dust which is harmful to workers seriously exceeds the allowable exposure concentration standard, which makes working in coal mines The incidence of pneumoconiosis among workers remains high, and real-time dust monitoring is the premise and key measure for effective dust prevention and control. [0003] At present, the dust monitoring equipment used in mines mostly adopts the principle of light scattering, and its measurement accuracy is greatly affected by changes in environmental temperature, humidity, coal quality and lithology, and the traceability of the value is not good. During the continuous monitoring process, problems such as optical windo...

AI Technical Summary

Problems solved by technology

[0003] At present, the dust monitoring equipment used in mines mostly adopts the principle of light scattering, and its measurement accuracy is greatly affected by changes in environmental temperature, humidity, coal quality and lithology, and the traceability of the value is not good. In the continuous monitoring process, problems such as optical window pollution and instrument drift are likely to occur, resulting in a decrease in measurement accuracy

At the same time, this kind of dust monitoring equipment cannot be calibrated in real time, resulting in insufficient reliability of the final detection results, which cannot meet the real-time monitoring needs of mine personnel

In addition, due to the need for dust reduction in the downhole operation environment, there are often a large number of atomized droplets around the spray dust reduction site or in the wind flow, which will make the accuracy of the detection results in this site unable to be guaranteed, so frequent inspections are required. Carry out manual calibration and post-maintenance

Furthermore, most of the existing monitoring equipment is a fixed structure, which cannot be easily moved, let alone carried around, and cannot complete the real-time measurement of the cumulative dust exposure of miners

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