A simulation experiment device for welding fume diffusion and blowing ventilation control

Abstract

An electrowelding smoke dust diffusion and push-pull ventilation control simulation experiment device of the present invention comprises a gas collection system, a transparent diffusion box, a plurality of temperature sensors, a plurality of gas concentration sensors, a data acquisition analysis system and a push-pull ventilation system. The top and the bottom of the diffusion box are equipped with the ventilation openings respectively, an air inlet of the gas collection system is arranged above a welding platform, and an exhaust port is communicated with a gas transmission pipe. One end of the gas transmission pipe far away from the gas collection system extends into the diffusion box and is equipped with a nozzle, and a heating device is arranged at the nozzle. The plurality of temperature sensors and the plurality of gas concentration sensors are distributed in the diffusion box evenly and are connected with the data acquisition analysis system separately and electrically, and the push-pull ventilation system comprises an air blower and an axial flow fan. The air-out end of the air blower is communicated with the bottom ventilation opening of the diffusion box, and the axial flow fan is installed in the top ventilation opening of the diffusion box. The advantages of the present invention are that the experiment results are accurate and reliable, and the scientific basis canbe provided for the research of the electrowelding smoke dust diffusion mechanisms and the push-pull ventilation control effects.

Description

technical field [0001] The invention relates to the technical field of electric welding fume diffusion research, in particular to a simulation experiment device for electric welding fume diffusion and blowing and suction ventilation control. Background technique [0002] Welding is a manufacturing process and technology that joins metals or other thermoplastic materials by heating, high temperature or high pressure, and it involves almost all industrial fields. There are many types of welding operations, such as manual arc welding, gas shielded welding, hydrogen arc welding, etc. Due to the different types of welding, different welding fumes will be produced during the welding process. Studies have shown that welding fume is respirable dust, and its particle size distribution is below 10 μm, accounting for 99.4%, of which 94.2% is less than 5 μm. At the same time, welding fume contains a large amount of toxic and harmful substances, which diffuse to the upper space of the ...

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Problems solved by technology

The current research on the diffusion and ventilation of welding fume mainly includes experimental research, theoretical analysis and numerical simulation. However, the welding fume itself has a certain lifting force, and the welding point layout is relatively flexible, so the use of blowing and suction ventilation can save some energy, but there is currently no experimental device for welding fume blowing ventilation research; welding fume hot air flow retention characteristics are obvious, and the numerical simulation of the ventilation effect is performed using computational fluid dynamics CFD software when the diffusion mechanism is not clear, and there is a lack of Compared with experiments, the simulation results are prone to inaccurate phenomena

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