Accident identification of wheel plate injuries

grinding machine is one of the most commonly used auxiliary equipment inside and outside the industry and is widely used in factories. The grinding wheel is brittle and fragile, and it is used frequently at high speeds. If you are not careful, it can easily cause injury. Whether the installation position of the grinding wheel is reasonable and meets the requirements; whether its use method is correct and whether it complies with safe operating procedures. These issues are directly related to the personal safety of every employee. Once something goes wrong in some link, it may cause serious personal injury accidents.

Zhongke Testing and Appraisal Institute can provide identification services for grinding wheel injury accidents and make accurate identifications of trace evidence analysis and accident cause analysis in various grinding wheel injury accidents.

1. The quality of the grinding wheel is poor. If the manufacturing quality of the grinding wheel is poor, cracks may easily occur during the working process and explosion accidents may occur.

2. Long storage time. The grinding wheel adhesive has a certain validity period, and the grinding wheel should not be stored for more than 2 years. Since the grinding wheel purchase star is relatively large in the early stages of the grinding machine being put into production, a considerable number of grinding wheels have been stored for a period that has expired, so the probability of bursting of these grinding wheels will increase significantly.

3. Storage is not standardized. The storage environment of the grinding wheel should be kept dry. There is a large amount of water vapor around the water explosion pool on site; water is carried on the crane clamp and drips below its running track, causing moisture to enter the grinding wheel, causing hidden dangers.

4. Collisions during on-site transportation will cause micro-cracks inside the grinding wheel, which can easily cause bursting.

5. There are obvious wear marks at the contact point between the grinding wheel and the grinding wheel pressure plate. If the grinding wheel pressure plate is not locked tightly, the grinding wheel and the grinding wheel pressure plate will rotate relative to each other, and the friction and heat will cause the temperature at both ends of the grinding wheel to rise rapidly, causing bursting.

One day, Lan (the main production and operation entity) handed over the fire water pipe repair project involved to Peng, the person in charge of the XX hardware store, and Peng provided the tools and materials (angle grinder, grinding wheel, wrench, etc.) needed for the repair. The specific maintenance process was arranged by Peng himself. During maintenance, Peng was cut by the rotating grinding wheel involved and died from excessive blood loss.

Entrusted by the client, a third-party appraisal agency conducted a technical appraisal of the "grinding wheel injury" accident to find the direct cause of the accident.

identification analysis results:

The identification expert group discussed and comprehensively analyzed the relevant information, on-site inspection and test data of the "grinding wheel injury" accident, and gave the following identification opinions.

(1) According to Article 19.101 of GB/T 3883.3-2007 "Safety of Handheld Power Tools Part 2 - Special Requirements for Grinders": the gap between the inside of the guard and the circumference of the new sanding part with the maximum diameter specified by the manufacturer shall be a maximum of 8mm for a grinding wheel with a diameter not greater than 130mm, and a maximum of 10mm for a grinding wheel with a diameter greater than 130mm. When the equipment involved is equipped with a protective cover, the grinding wheel disc involved cannot be installed on the equipment involved.