Design method for rops framework and cab for engineering machines

A design method for an ROPS framework comprising the following steps:

• obtaining, by calculation specified in GB/T 17922, GB/T 19930 or GB/T19930.2, target values of a lateral load Fmax and lateral load energy Umax of an ROPS framework according to maximum mass of applicable machines of the ROPS framework;
• selecting, according to features of applicable machines of a cab, a suitable cab framework structure type from a simply supported beam structural mechanics model, wherein the simply supported beam structural mechanics model comprises a common cab framework structure, a framework structure reinforced with a middle cross beam, or a framework structure reinforced with cable-stayed beams;
• based on the suitable framework structure type selected from the simply supported beam structural mechanics model and the target values of the lateral load Fmax and the lateral load energy Umax obtained by calculation, obtaining two profile sectional modulus sum values by calculation according to a maximum lateral load Fmax quick calculation formula and a maximum load energy Umax quick calculation formula, and taking the greater one of the two profile sectional modulus sum values as a final profile sectional modulus sum of all pillars and top cross beams meeting a relation;
• and
• selecting suitable profiles according to the profile sectional modulus sum, and constructing a closed spatial framework structure according to the selected cab framework structure type,