When the bellows receives the axial pressure that exceeds its support ability, it will be the same as the pressure bar or cylindrical spiral spring, and it will immediately zigzag and lose the stability of the straight line. That is certain. If the internal pressure accepted by the bellows exceeds the certain pressure value it can support, instability may also occur. The test proved that the bellows in the project was destroyed mainly because of this reason. Whether it is elastic seal, axial elastic compensator, stainless steel Sandblasting hose , there are such questions.
In other words, the ability of bellows to accept internal pressure generally depends on its stability. The stability of bellows can be studied by calculating the critical load using the commonly used European tie rod formula.
The machining errors of waviness and machining thickness often cause the axis of bellows to go against the initial axis of symmetry. In other words, the axis of the practical bellows has some initial twists and turns. As for the stainless steel sandblasting hose, the non-uniformity and inconsistency of the strength of each part of the reticulated shell limit the load-carrying ability of the bellows. The zigzag stiffness value in the critical load formula must consider the peak (valley) half arc of the bellows as the rigid connection point of the diaphragm, which is higher than the practical bending stiffness value.
The share of mesh sleeve and bellows cover is generally 75~95%. If the value is too large, the flexibility of the bellows will be suppressed. If the value is too small, it will not be able to keep the bellows from mechanical damage, such as knock, bump, grinding, bump. Its value scale also directly affects the function of stainless steel sandblasting hose, which means that contrary to the knitting concept, if the ceiling is suspended, it can make the stainless steel Sandblasting hose Accept higher load, but it is bad for its soft function; If the lower limit is taken, it is conducive to appearance. It's soft, but it can't accept high loads.
