Folding hydraulic ladder and platform trailer

Abstract

The invention discloses a folding hydraulic ladder, which comprises an upper step ladder, a lower step ladder and a hydraulic cylinder, wherein one end of the upper step ladder is hinged to a frame, and the other end of the upper step ladder is hinged to the lower step ladder; the folding hydraulic ladder also comprises a triangular arm and a connecting rod; one end of the connecting rod is hinged to the frame and the other end of the connecting rod is connected to a first moveable end of the triangular arm; the fixed end of the triangular arm is hinged to the upper step ladder; a second moveable end of the triangular arm located at the lower step ladder is hinged to a pulley; a sliding plate used in conjunction with the pulley is arranged at the edge of the lower step ladder; the hydraulic cylinder drives the triangular arm to move through the connecting rod, so as to drive the pulley to push the sliding plate to move for unfolding the lower step ladder. The invention also discloses a platform trailer, which is provided with the hydraulic ladder capable of folding automatically. The folding hydraulic ladder and the platform trailer disclosed by the invention are simple in structure, safe and reliable, economical and practical, the working efficiency is improved, the labor intensity of workers is reduced and the possibility of safety accidents is also reduced, therefore the folding hydraulic ladder and the platform trailer are suitable for large-scale promotion.

Description

technical field [0001] The invention relates to the technical field of engineering vehicles, in particular to a folding hydraulic climbing ladder and a flatbed trailer. Background technique [0002] With the increasingly fierce competition in the transportation industry market, the types of trailers are also increasingly subdivided. One of the important classifications is the flatbed trailer for professional transportation of construction machinery. In order to facilitate the transportation of construction machinery with relatively large weight and volume, a There are ladders, which require manual operation by workers during the process of lifting and lowering the ladders. Limited to the integrated structure of the ladders, it is impossible to increase the length of the ladders too much. Therefore, the flatbed trailer in the prior art has the disadvantages that the labor intensity of the operator is high during use, accompanied by certain dangers, and the short climbing ladd...

AI Technical Summary

Problems solved by technology

Therefore, the flatbed trailer in the prior art has the disadvantages that the labor intensity of the operator is high during use, and it is accompanied by certain dangers, and the climbing ladder is short so that it is difficult to reach the climbing angle of the construction machinery.

[0003] Due to the height restriction of the engineering low-bed semi-trailer and the small requirements for the climbing ladder angle of some special engineering vehicles, some engineering low-bed semi-trailers change the ladder into a hydraulic lifting and folding type, but when the ladder is placed in a certain position, the upper ladder cannot be free. To stretch and open, it is necessary to use manual external force to pull or install a set of expansion cylinder mechanism separately to be able to stretch, which is not only complicated to operate but also unsafe

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