Because of the inhomogeneity, deterioration and defects of the welded metal materials, there are three basic assumptions in materials science; The continuity hypothesis, uniformity hypothesis and isotropy hypothesis are not satisfied, which requires the application of fracture mechanics theory. The task of fracture mechanics is to use linear elastic fracture mechanics and elastic-plastic fracture mechanics to solve the crack problem of components based on the fact that there are macro microcracks in the components. Namely, the crack size, working stress and the ability of materials to resist cracks (that is, the crack tip opening displacement CTOD fracture toughness value) in the component are quantitatively linked, and the safety and life test analysis and evaluation are carried out for the components containing microcracks and joints with poor quality tissue.

The pneumatic ball valve of the filling machine uses compressed air as the main power source. It is filtered into dry and clean gas by the triplet (filter, pressure regulator, oil mist) carried in the machine, and then sent to the pneumatic ball valve actuator to drive the ball valve to rotate 0-90 degrees to open or close the valve. Proper fuel injection of the atomizer can ensure that the system works in a good environment. Working principle: the barrel pushing cylinder of the filling machine acts synchronously with the pneumatic actuator of the pneumatic valve. The pneumatic valve cylinder of the filling machine lifts the elbow and pushes the barrel cylinder into a barrel. When the pneumatic valve drops, the barrel pushing cylinder retracts. At this time, the positioning cylinder acts to push the barrel tightly against the brush. The brush of the barrel brushing machine operates continuously. The brush drives the empty barrel to rotate when brushing the barrel, Therefore, every part of the empty barrel can be brushed. The washed empty barrels are pushed to the rinsing station by the barrel pushing cylinder to clean the empty barrels, then the empty barrels behind are pushed into the upper barrel rack, and then the upper barrel rack is turned up by the upper barrel cylinder, and the empty barrels slide freely into the barrel seat.