Height-adjustable road height-limiting portal frame and adjusting method

Abstract

The invention discloses a height-adjustable road height limiting portal frame and an adjusting method, belongs to the field of urban road and highway safety protection, and particularly relates to a height limiting device capable of changing the height to limit the passing of ultrahigh vehicles. The portal frame comprises a fixed lower structure and an upper structure capable of being folded to adjust the height, a stand column and a cross beam of the upper structure are fixed to the lower structure through a rotating shaft, a balancing device is arranged on the rotating upper structure, the rotation can be achieved through manual operation without power, the position of the cross beam is changed by rotating the upper structure, and the height change of the height limiting portal frame isachieved. And an arranged self-locking mechanism can be automatically locked when the portal frame is adjusted in place. Compared with a lifting type height limiting portal in the prior art, a complexdriving mechanism is omitted, the cross beam and a balance weight are balanced, the conversion structure is simple, the manufacturing cost is low, electric power is not needed, and the adaptability is good.

Description

technical field [0001] The invention relates to a height-adjustable road height-limiting mast and an adjustment method, belonging to the field of urban road and road safety protection, and in particular to a height-limiting device capable of changing the height to limit the passage of super-high vehicles. Background technique [0002] Bridges and tunnels on urban roads and highways have a certain height limit to ensure the safety of vehicles. The "Regulations for the Implementation of the Road Traffic Safety Law of the People's Republic of China" stipulates: "The load on a motor vehicle must not exceed the weight approved on the motor vehicle driving license, and the length and width of the load must not exceed the compartment, and the following regulations shall be complied with: Heavy-duty and medium-sized trucks , the height of semi-trailer vehicles shall not exceed 4m from the ground, and the height of vehicles carrying containers shall not exceed 4.2m; the height of oth...

AI Technical Summary

Problems solved by technology

Lifting height limit mast, if it is adjusted from a small car with a height limit of 3.0m to a large vehicle with a height limit of 4.5m, the beam of the mast needs to be lifted by 1.5m, and the hydraulic lift requires a hydraulic cylinder with a stroke of 1.5m, and a screw screw to lift up to 1.5m , the lifting mechanism requires a larger size, and the lifting-type height-limiting mast is compared with the ordinary fixed mast, which adds a complex mechanical transmission mechanism and high manufacturing cost

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