Principle: Metal can reflect electromagnetic waves, and the electromagnetic waves emitted by the metal detector are reflected and received by the metal detector when they reach the metal surface.

The purpose of safety inspection:

Safety inspection is a means to discover the existence of unsafe factors, which is the first ideological problem that inspectors should solve. Every inspection, what to check, what to achieve through inspection, and what kind of effect to achieve, as an inspector, we must first know fairly well.

In safety inspection, it often happens that the inspected only knows the general content to be inspected, and the inspector is not very clear about the purpose and significance of his participation in the inspection. In this way, over time, the number of inspections increases, and the inspectors become accustomed to it, and the inspected people become slack, paralyzed and tired, thinking that inspection is one thing.

Therefore, before each inspection, the purpose and significance of the inspection can be explained by on-site mobilization and heart-to-heart, combined with the actual situation, so that each participant has a clear purpose and know fairly well.