Ladder frame structure of aerial ladder fire truck

Abstract

A ladder frame structure of an aerial ladder fire truck comprises a guardrail and a bracket. Pedals are mounted on the bracket. The ladder frame structure is characterized in that a plurality of oblique beams are mounted between the adjacent pedals, and the intersection points of the adjacent oblique beams are located on the pedals. According to the ladder frame structure, an original linear crossbeam-type pedal rod structure is converted into a pi-shaped ladder frame pedal rod structure, the size of the section of a main crossbeam is decreased, square steel pipes are additionally arranged inthe opposite direction of extending of a ladder frame from the center to the two sides to be obliquely connected with the next section of pedal rods, and the section spacing of the pedal rods is keptunchanged; and the structural size and layout of pi-shaped ladder frame pedal rods are different from the structural size and layout of existing linear crossbeam-type pedal rods and are improved, andunder the premise that that the strength performance of materials are met, mass decreasing and height increasing of the ladder frame are facilitated through reducing of the size; and structural layoutoptimization is helpful to improve the safety performance of the ladder structure.

Description

technical field [0001] The invention relates to the field of special vehicles, in particular to a ladder frame structure for a fire-fighting vehicle with an aerial ladder. Background technique [0002] Aerial ladder fire trucks are the main equipment for high-altitude emergency rescue in modern cities. There are only a few domestic companies that can produce low-end aerial ladder fire trucks, and high-end products are almost entirely imported. The ladder frame structure is the key and core component of the aerial ladder fire truck. A ladder frame structure with light weight and reasonable layout is an inevitable requirement for high-end aerial ladder trucks. Aerial ladder fire trucks mostly use a telescopic multi-section truss combined ladder frame structure. The step bar is the bottom of each ladder frame connecting the two sides of the structure and the main load-bearing component. Its structural size and reasonable layout determine the ladder frame structure and even the ...

AI Technical Summary

Problems solved by technology

Most of the steps of the ladder frame adopt a simple "one" shaped beam design, most of the structural dimensions are too large, the safety factor is too high, and the hollow layout between adjacent steps poses the risk of stepping into the air

Static and dynamic analysis also shows that this type of ladder frame has defects of large stress and strain and low modal frequency, and the structural performance of the ladder frame needs to be studied and optimized

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