A manual switching multi-mode steering hydraulic control system and a wheeled crane

Abstract

The invention relates to a manual switching multi-mode steering hydraulic control system and a wheeled crane. The multi-mode steering hydraulic control system includes a full hydraulic steering gear, a first hydraulic control reversing valve, a second hydraulic control reversing valve, a first diverter A flow-collecting valve, a second flow-dividing and collecting valve, a third hydraulic control reversing valve, a fourth hydraulic control reversing valve, a first handle control reversing valve and a second handle control reversing valve. The multi-mode steering hydraulic control system provided by the present invention uses the handle to control the reversing valve to form a multi-mode selection valve. Mode switching valve control, the hydraulic source is diverted through the diversion and flow valve to provide energy for the steering system, and the hydraulic control valve is used to control the flow of the hydraulic oil circuit so that the front and rear axle steering oil cylinders work according to the set requirements and drive the wheels Turn according to the driver's operation intention to realize multi-mode steering.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to a manually switched multi-mode steering hydraulic control system and a wheeled crane including the multi-mode steering hydraulic control system. Background technique [0002] Traditional passenger vehicles and commercial vehicles are mostly driven and transported on the road, and they can meet the requirements of use by using traditional front wheel steering or front wheel steering. However, for some special wheeled construction machinery, it is often necessary to work under a variety of complex site conditions. In order to meet the use requirements of complex sites, engineering vehicles are generally equipped with multi-mode steering functions. The multi-mode steering here refers to the multiple steering modes of the vehicle. The common steering forms are: independent steering of the front axle (front group), independent steering of the rear axle (rear group), small turn (al...

AI Technical Summary

Problems solved by technology

in, figure 2 When the manually operated multi-mode steering valve shown is switched to the small turn and crab steering positions (that is, the valve body is in the second and fourth positions on the left), the front and rear steering hydraulic cylinders form a series structure At this time, after the pressure provided by the hydraulic system pushes the front axle to turn, the remaining pressure can also push the rear axle to turn. The structure of the valve itself is complicated, and the function of the valve core is special, so the cost is relatively high

[0008] image 3 In the electro-hydraulic proportional multi-mode scheme shown, the accuracy, sensitivity and reliability of the wheel angle are too dependent on the accuracy and reliability of the electrical components and hydraulic components. Once the electrical components (especially encoders and controllers) fail, the steering The system will not work according to the driver's intention, which is very dangerous for high-speed vehicles

In addition, the structure of this control system is relatively complicated, requiring professional operation, inconvenient maintenance, and relatively high cost.

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