Oil-air suspension system and engineering machinery with the system

Abstract

The invention provides a hydro-pneumatic suspension system and engineering machinery with the same. The hydro-pneumatic suspension system comprises a suspension cylinder, a pressure sensor, a controller and an energy accumulator unit. The pressure sensor is configured to detect the pressure of a rodless cavity of the suspension cylinder and output a pressure value. The controller is configured toreceive the pressure value and compare with a preset pressure value, a first control command corresponding to the pressure value is output according to the corresponding relation between the preset comparison result and the first control command. The energy accumulator unit is configured to receive the first control command and perform the corresponding preset actions to obtain the corresponding preset stiffness. The preset actions include changing the initial pressure of an energy accumulator and / or changing the capacity of an energy accumulator connected to the hydro-pneumatic suspension system. The hydro-pneumatic suspension system and the engineering machinery with the same can change the stiffness of the suspension system under different loads to achieve better hydro-pneumatic suspension function. Furthermore, suitable damping can be matched according to different road conditions to improve the driving and riding comfort.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to an oil-air suspension system and an engineering machinery with the system. Background technique [0002] Usually, the oil-gas spring is filled with compressed gas and oil in a closed container, and the device that uses the compressibility of the gas to realize the spring action is called an oil-gas spring. The oil-gas spring uses inert gas (nitrogen) as the elastic medium and oil as the force transmission medium. It is generally composed of a gas spring and a suspension cylinder equivalent to a hydraulic shock absorber. [0003] At present, most of the engineering machinery and equipment using the oil-pneumatic suspension system are only given the stiffness under the rated load in the design stage. This shortcoming is more obvious when the axle load difference between the no-load and full-load states is greater. When the axle load reaches 12 tons, another rigidity value tha...

AI Technical Summary

Problems solved by technology

This shortcoming is more obvious when the axle load difference between the no-load and full-load states is greater. When the axle load reaches 12 tons, another rigidity value that can adapt to it is needed to ensure the normal running of the equipment, otherwise it will only lose the function of oil-air suspension

[0004] At the same time, when construction machinery and equipment travel on different roads, the excitation frequency of the body is different, resulting in great differences in driving comfort.

For example, on cement roads and gravel roads, if the designed oil-air suspension system only matches the damping ratio with the cement road as the standard to ensure its comfort, then the vibration damping and buffering effect of the equipment will drop sharply after driving on the gravel road.

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