A hydraulic leveling system for an aerial work vehicle

Abstract

Disclosed is a hydraulic pressure leveling system of a high-altitude operation car. A magnetic exchange valve is connected with a first balance valve and a second balance valve. The first balance valve and the second balance valve communicate with two cavities of an active leveling oil cylinder correspondingly. The first balance valve and the second balance valve communicate with two cavities of a slave leveling oil cylinder correspondingly. Vent valves are arranged in the two cavities of the active leveling oil cylinder and the two cavities of the slave leveling oil cylinder. A back pressure valve is arranged in the opening T of the magnetic exchange valve, and a flow controlling valve is arranged in the opening P of the magnetic exchange valve. The reverse control opening of the first balance valve communicates with the opening B of the first balance valve, the forward control opening of the first balance valve communicates with the opening A of the second balance valve, the reverse control opening of the second balance valve communicates with the opening B of the second balance valve, the forward control opening of the second balance valve communicates with the opening A of the first balance valve, the forward control opening of a third balance valve communicates with the opening A of a fourth balance valve, and the forward control opening of the fourth balance valve communicates with the opening A of the third balance valve. Both the forward opening pressure of the third balance valve and the forward opening pressure of the fourth balance valve are smaller than or equal to 2 Mpa, and both the reverse control oil opening of the third balance valve and the reverser control opening of the fourth balance valve are unloaded. According to the hydraulic pressure leveling system, the problems of lag and deflection in operating platform leveling can be solved.

Description

technical field [0001] The invention relates to the technical field of leveling aerial work vehicles, in particular to a hydraulic leveling system. Background technique [0002] At present, the leveling system of telescopic arm or mixed arm type aerial work vehicle generally adopts two methods of hydraulic leveling and electro-hydraulic automatic leveling. Due to the high cost and complicated control of electro-hydraulic automatic leveling, it is generally suitable for high-altitude operating vehicles with large heights and complex operating conditions. For low-height telescopic boom or hybrid boom aerial work vehicles, hydraulic leveling or hydraulic leveling plus mechanical leveling are generally used. [0003] At present, the hydraulic leveling system has the problem of leveling lag during the leveling process, which reduces the efficiency of the work platform leveling. At the same time, there is also the problem of the skewed work platform after leveling. It is inconve...

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Problems solved by technology

[0003] At present, the hydraulic leveling system has the problem of leveling lag during the leveling process, which reduces the efficiency of the work platform leveling. At the same time, there is also the problem of the skewed work platform after leveling. It is inconvenient for the workers in the high-altitude operation to carry out high-altitude operations, and even bring certain safety hazards to the high-altitude workers

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