12 3 1 the cause of the explosion accident in Foshan factory.

In the process of cleaning the machine with Tianna water (which belongs to flammable and explosive dangerous chemicals, and its volatility is second only to gasoline), gas deflagration occurs.

Cause identification: improper operation by workers.

The investigation team of Guangdong provincial government held a plenary meeting and initially determined that the explosion was a production safety liability accident.

After investigation, the accident happened as follows: on February 365438+February 30, 2004, the axle assembly workshop of Workshop 3 of Hua Fu Construction Machinery Manufacturing Co., Ltd. stopped production during the trial production, and the workshop leader informed some employees to go to the workshop for inventory, cleaning and equipment maintenance and transformation. At 7: 30, 87 employees started work one after another. In the meantime, 24 people used flammable liquid thinner to clean the surface paint of assembly lines on both sides of axle assembly lines A and B; Five people are going to do welding work near the axle assembly line b; Three people cut near the axle assembly line; Other personnel are taking stock, marking the ground, maintaining and repairing equipment, etc. ; The diluent used in line A is about 165 kg, and that used in line B is about 150 kg. During the cleaning process, thinner flows into the groove of the axle assembly line. At about 9: 28, when Liang Moumou (who did not obtain the special operation certificate) and others welded and installed the pipe winder on the I-beam about 5 meters above the axle assembly B line with an electric welding machine, the B line area exploded, and then the axle assembly A line area also exploded.

Through investigation, on-site investigation and physical evidence identification, it is preliminarily found that the direct cause of the accident is that during the process of cleaning the equipment and ground of the axle assembly line with a large amount of diluent, the flammable gas generated by the evaporation of diluent flowing into the trench of the axle assembly line is mixed with air to form an explosive mixture, which is triggered by sparks generated by illegal welding operations on site.