Intrinsic safety-type dust sensing device used for mining based on light scattering method

Abstract

The invention discloses an intrinsic safety-type dust sensing device used for mining based on a light scattering method. The dust sensing device is characterized by comprising a laser light source (9), a detection cavity (11) and an air blower member which are arranged along same axis, wherein, a light extraction end of the laser light source (9) is communicated with one end of the detection cavity (11), the laser emitted by the laser light source (9) is propagated along the axis, wherein, the intrinsic safety-type dust sensing device also comprises a photoelectric conversion assembly (14), the photoelectric conversion assembly and axis are vertically placed over the detection cavity (11), which faces to a through hole at the upper part of the detection cavity (11), wherein, the air blower member is used for introducing the to-be-measured air into the detection cavity (11).

Description

technical field [0001] The application belongs to the technical field of electrical control and coal mine safety, and relates to a mine-used intrinsically safe dust sensor based on a light scattering method, and more specifically, to a dust concentration detection device with a dust sensor. Background technique [0002] Dust (especially the dust generated in the production process) is more harmful. Pneumoconiosis caused by long-term inhalation of high-concentration dust is the most common occupational disease; toxic elements such as lead, cadmium, arsenic, and manganese contained in the dust dissolve in the respiratory tract Absorbed into the blood circulation to cause poisoning; hair dust, cotton dust and other light dust, when inhaled into the respiratory tract, easily adhere to the mucous membranes of the nasal cavity, trachea and bronchus, long-term local irritation and continuous infection cause chronic inflammation. In addition, dust can also cause eye diseases, skin d...

AI Technical Summary

Problems solved by technology

[0003] Chinese invention patent ZL200820122691.2 discloses a laser dust detector, which includes a dark room with an air inlet and an air outlet, and a gas channel separated by two partitions is installed between the air inlet and the air outlet. One end of the darkroom is provided with a light source generated by a laser generator, and the other end of the darkroom is provided with an optical lens group and a photoelectric receiver in sequence corresponding to the light source, and the two partitions are provided with a light source corresponding to the light source. corresponding light hole; the air outlet of the darkroom is connected to an air pump, a humidity sensor and an exhaust port in sequence; the photoelectric receiver is connected to a preamplifier, an integrating circuit, an analog-to-digital converter and A single-chip microcomputer; however, the photoelectric receiver of the laser dust detector receives the scattered light intensity signal of dust (particles), and the size of the light exit hole on the partition is very important. If the light exit hole is too large, when the gas particles are irradiated by the laser The refracted or reflected light is not easy to be received by the photoelectric receiver; the light outlet is too small, which is not conducive to the photoelectric receiver to completely receive the scattered light intensity signal. Therefore, if the light outlet on the partition is too large or too small, both It is easy to affect the accuracy of the test results

And the dust inlet channel is set vertically, it is easy to make the dust fall too fast, the air flow is unstable, and the measurement accuracy is affected

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