Passive distance-adjustable crawling ladder for flat transport vehicle

Abstract

A passive distance-adjustable crawling ladder for a flat transport vehicle is characterized in that the lower ends of two crawling ladders are hinged to the tail part of a vehicle body through two overturning shafts A; the length of a turnover shaft A is greater than the width of each crawling ladder; a base of an overturning hydraulic cylinder is hinged with the vehicle body through an overturning shaft B, and the piston rod end of the overturning hydraulic cylinder is hinged with the crawling ladders; a push-pull supporting frame comprises an arc-shaped plate with an arc-shaped hole and twosupporting legs, and the two supporting legs are fixedly connected with the crawling ladders; a base of a transverse moving hydraulic cylinder is fixedly connected with the vehicle body, and the end of a piston rod of the transverse moving hydraulic cylinder is fixedly connected with a push-pull rod penetrating through the arc-shaped hole; a port P of a first reversing valve is connected with an oil source, a port T of the first reversing valve is connected with an oil tank through a third reversing valve and connected with an energy accumulator through a first one-way valve, and a port A of the first reversing valve is connected with a rodless cavity of the overturning hydraulic cylinder through a second reversing valve; and the energy accumulator is connected with the oil tank through anoverflow valve and further connected with a rodless cavity of the transverse moving hydraulic cylinder through a fourth reversing valve and a second one-way valve, and the rodless cavity of the transverse moving hydraulic cylinder is connected with the oil tank through a fifth reversing valve. The crawling ladder can effectively meet the transportation requirements of different devices.

Description

technical field [0001] The invention belongs to the technical field of transport vehicles, in particular to a ladder with adjustable passive spacing for flat transport vehicles. Background technique [0002] Flatbed transport vehicles are usually used to transport various types of vehicles, construction machinery and other large and heavy-duty goods. Most of the body parts of flatbed transport vehicles have no railings. etc.) during the process of getting on and off the car, the tail of many cover plate transport vehicles is equipped with two ladder devices on the left and right. In an ideal state, the distance between the two ladders corresponds to the distance between the tracks or tires of the self-propelled equipment, and the equipment to be transported can climb onto the vehicle body or drive away from the vehicle body through the ladders. [0003] In the prior art, the ladder on the common flatbed transport vehicle is relatively fixed in the lateral direction, but in ...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above problems, the method of directly increasing the width of the ladder is usually adopted, but this will not only increase the difficulty of retracting and retracting the ladder, but also increase the quality of the ladder, which in turn will affect the payload of the vehicle

In addition, there are still some ways to solve the above problems through complex mechanical structures and power devices, but such schemes have high mechanical complexity and high manufacturing costs.

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