First, people step on mines-> liquid explosives (2) are squeezed into the fuse chamber (3) through the connecting holes, so that the liquid level in the fuse chamber (3) pushes the iron plug upwards (1) (all the parts marked by the green line are iron plugs). When the iron stopper (1) moves upward, the lower space of the iron stopper (1) is larger, and the firing pin (5) can push the steel ball to hit the primer (0). ignite