Chapter V (1) Case Analysis of Work Safety Accidents

Chapter V Typical Accident Case Analysis

A. Requirements on the content, location and importance of the exams in the book

festival

Title number

Examination content

Position in the book

ask

one

Typical safety production accident cases

Know very well

two

Investigation, analysis and treatment methods of typical safety production accidents

grasp

three

Knowledge of accident investigation, analysis, treatment, rectification and preventive measures.

grasp

C. Simulated test questions

For the following accident cases, analyze the direct cause, indirect cause, responsible person and corrective measures.

Case 1

1On the morning of October 8th, Comrade Yu Yueqing and his student Chen Lianzhong, a third-class punch in the stamping section of workshop 32 of No.202 plant, used the 101042 eccentric punch to carry out the first drawing process of tea boats (civilian products). Because of the work efficiency, we did not report to the relevant departments when we knew that the safety device of the punch was out of order, but we still operated. 10, 15, Comrade Liu Yangxi, deputy director of production, found that safety devices were not used during operation and immediately criticized them, but Chen still did not report the failure of safety devices at this time. 1 1 Operating the punching machine in Yueqing, the right hand reached into the dangerous area (upper and lower dies) to take and put parts, without using safety devices and safety tools. 1 15 The second index finger, the third middle finger and the second ring finger of the right hand were severely injured.

Chenglaofa (1 9xx) No.23 and Factory Technology (19xx) No.504 clearly stipulate that1) the failure of safety devices shall be stopped; 2) When working, the hand shall not extend between the upper and lower dies. The factory held a training course on safety technology of punching and shearing machine.

Case 2

On xx day, Li Yi, vice squad leader of slag cleaning class, made arrangements for the day's work after talking about safety precautions at the pre-shift meeting: Wang Wen and AARON Li were responsible for lifting the slag pool and turning the slag pool, and other personnel went to clean under the oxygen top furnace pit and drove the oxygen top slag car. At about 10: 30, the slag cleaner Lin and Liu Daqi drove the slag car out of the oxygen top furnace pit, and the crane operator lifted the slag basin from the slag car. Under Wang Wen's command, put the slag basin next to the third stigma in the direction of the slag yard's return pool to draw water to cool down, and then go home for lunch.

13, Wang et al. continued the slag cleaning work. 14: 30 or so, in order to expand the working area and facilitate the operation of Class Two, Wang Wen violated the regulation of "No overlapping slag cans" in the workshop and directed the crane driver to put one slag can in the middle of the slag yard on another one, that is, the one put in the morning, and unhook it; Just as he was about to leave, the slag basin below exploded, knocking Wang Wen to the ground, and his whole body caught fire, burning ⅲ degrees, with an area of 99.9%. The rescue was invalid and he died on the same day 18.

The investigation team believes that the overlap of slag tanks will break the uncooled slag shell below, and cold water will penetrate into the uncooled slag below, causing water vapor explosion.

Forced rapid cooling of molten iron slag basin has been going on for a long time, and there have been several similar attempted accidents before.

Background: The production task increased from 50,000 tons of steel last year to 65,438+10,000 tons that year. Even with funds, it is impossible to stop production and transform, not to mention the limited conditions. The task of 65438+ 10,000 tons of steel needs to be completed 14 days in advance. The workshop has repeatedly reported the operation procedure of "forced rapid cooling water" to the factory leaders.

Case 3

An Min, a three-group lathe worker in Metalworking Workshop No.1, undertakes the processing task of 150s50 pump shaft, specifically the threading process, and operates on the c620 lathe. Completed 3.25 hours before the morning work on xx (the working hour quota should be 3. 12 hours). I didn't wear work clothes in the morning.

In the afternoon, Ann continued her processing task, but she still didn't wear work clothes. 12: 45 or so, Ding He, who was working before and after, suddenly heard a scream from Ann, saw that Ann's coat had been handled, and all the rotating pump shafts were rolled up, and immediately called for a switch. Liu, 20 meters away from Ann, immediately cut off the switch of the workshop near her.

It can be clearly seen from the scene of the accident that the jacket (including underwear) of the safety supervision department is wrapped on the processed 682 mm long pump shaft, covering a large part of the pump shaft from the triangular chuck. The arm is located below the pump shaft, near the pump shaft part at the triangular chuck, and extends obliquely upward. The right side of the head is close to the triangular sucker, and the part that contacts with the sucker is the split brain. The body hangs straight on the lathe, only the bottom is intact.

When the wrapped coating was untied from the pump shaft, it was found that a part of the edge of the acrylic sleeve had been tightly adhered to the surface of the "degassed" part of the pump shaft. As can be seen from the lathe relay table, the lathe speed was 480 rpm when the accident occurred.

Although there are "Operating Rules for Safe Production of Mechanical Systems", it has been required and publicized for many times to wear work clothes, but before the accident, about 20%-25% people still did not wear personal protective equipment as required. In addition, the ground conditions of the workshop are very poor, and the workpieces are piled up in disorder.