Hydraulic control system of construction vehicle and construction vehicle

Abstract

The embodiments of the invention provide a hydraulic control system of an engineering vehicle and the engineering vehicle. The hydraulic control system comprises an oil tank, a first main pump, a steering oil cylinder, a first reversing valve, a first working oil way, a second working oil way and a switching valve; the first main pump is connected with the oil tank; the steering oil cylinder comprises a first cavity and a second cavity, the first working oil way communicates with the first cavity, and the second working oil way communicates with the second cavity; the first main pump selectively communicates with the first working oil way or the second working oil way through the first reversing valve, the steering oil cylinder is a double-acting oil cylinder with double piston rods, and the switching valve is connected between the first working oil way and the second working oil way; the switching valve has a cut-off state and a communication state, and when the switching valve is inthe cut-off state, the first working oil way and the second working oil way are disconnected; when the switching valve is in the communication state, the first working oil way and the second working oil way communicate with each other. The engineering vehicle adopting the hydraulic control system can actively steer and passively steer.

Description

technical field [0001] The invention relates to the technical field of hydraulic pressure, in particular to a hydraulic control system of an engineering vehicle, and also relates to an engineering vehicle using the hydraulic control system. Background technique [0002] Under icing conditions, ice, snow, and frost will have a direct impact on the operational safety of the aircraft. They will roughen the outer surface of the aircraft, increase the weight of the aircraft, limit the range of movement of the aircraft control surfaces, and cause instrument errors. Increased aircraft stall speed and instantaneous abnormal pitching will greatly reduce the flight performance of the aircraft, especially when the aircraft takes off and ascends, it will make the flight attitude difficult to control, and even cause air crashes. Therefore, in order to ensure normal shipping and flight safety, it is necessary to remove the frost and snow on the surface of the aircraft. The cleaning and de...

AI Technical Summary

Problems solved by technology

[0002] Under icing conditions, ice, snow, and frost will have a direct impact on the operational safety of the aircraft. They will roughen the outer surface of the aircraft, increase the weight of the aircraft, limit the range of movement of the aircraft control surfaces, and cause instrument errors. Increased aircraft stall and instantaneous abnormal pitching will greatly reduce the flight performance of the aircraft, especially when the aircraft takes off and ascends, making the flight attitude difficult to control, and even causing air crashes

Therefore, in order to ensure normal shipping and flight safety, it is necessary to remove the frost and snow on the surface of the aircraft. The cleaning and deicing vehicles currently used in airports are mainly self-propelled or towed, with various functions such as deicing, cleaning and spraying anti-icing fluid. function, the towed cleaning and deicing vehicle needs to be equipped with an additional trailer, and the self-propelled cleaning and deicing vehicle is different from the common passenger car. In this situation, an external trailer may be required for rapid transfer. The double-acting cylinder in a conventional hydraulic four-wheel steering system can achieve stable active steering, but cannot use a trailer for passive steering.

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