Vehicle body inclination-angle regulating uint, hydropneumatic suspension mechanism and mobile crane

An automatically-leveling hydropneumatic suspension mechanism, comprising at least two pairs of suspension oil cylinders, each pair of which are respectively arranged on the left and right sides of a corresponding vehicle bridge, wherein, the automatically-leveling hydropneumatic suspension mechanism further comprises:

• vehicle body inclination angle regulating units, each of the suspension oil cylinder being correspondingly connected with one of the vehicle body inclination angle regulating units, each of the vehicle body inclination angle regulating units designed to control a cylinder rod of the corresponding suspension oil cylinder to extend or retract;
• a vehicle body transverse inclination angle sensor, designed to detect the transverse inclination angle of vehicle body;
• and
• a control unit, which receives the signal of transverse inclination angle of vehicle body sent by the vehicle body transverse inclination angle sensor, and is connected with the vehicle body inclination angle regulating units through electric control circuit, the vehicle body inclination angle regulating unit comprises a balancing oil cylinder, one chamber of the balancing oil cylinder is connected to an oil tank and an oil source for leveling operation by a hydraulic pipeline provided with a first one-way damper valve and an electric controlled switch valve, and the electric controlled switch valve selectively controls the one chamber of the balancing oil cylinder to communicate with the oil tank or the oil source for leveling operation;
• and
• the other chamber of the balancing oil cylinder is connected to a non-rod chamber of the corresponding suspension oil cylinder by a hydraulic pipeline provided with an electric controlled shutoff valve and a second one-way damper valve, and the electric controlled shutoff valve selectively communicates or shuts the communication pipeline between the other chamber of the balancing oil cylinder and the non-rod chamber of the corresponding suspension oil cylinder;
• the control unit is connected to the oil source for leveling operation and the electric controlled switch valve and the electric controlled shutoff valve in the vehicle body inclination angle regulating unit through electric control circuits.