Multi-mode steering hydraulic control system and wheeled crane using same

Abstract

The invention discloses a multi-mode steering hydraulic control system. In the system, a flow distributing and collecting valve and an electromagnetic reversing valve are combined, the flow distributing and collecting valve distributes flow of a hydraulic source according to a certain proportion and provides energy for the steering system, and the electromagnetic valve controls the flow directionof a hydraulic oil circuit, so that front and rear groups of steering oil cylinders work according to a set requirement and drive wheels to rotate according to the operation intention of a driver to realize multi-mode steering. Compared with the prior art, the scheme has the advantages that: the front and rear steering oil cylinders are connected in parallel in an arbitrary steering mode, so thatthe problem of a high requirement on sealing property due to overhigh pressure of the front group of steering oil cylinders in the prior art is solved, and manufacturing cost can be effectively controlled; meanwhile, the hydraulic control system eliminates the influence of a circuit fault, and driving safety is ensured. On the basis, the invention also provides a wheeled crane using the multi-mode steering hydraulic control system.

Description

Technical field [0001] The invention relates to a wheeled engineering machine, in particular to a multi-mode steering hydraulic control system and a wheeled crane applying the system. Background technique [0002] Traditional passenger vehicles and commercial vehicles mostly run and transport on the road. They can meet the requirements of use by adopting traditional front wheel steering or front wheel steering. However, some dedicated wheeled construction machinery often need to work under a variety of complex site conditions. In order to meet the requirements of the use of complex sites, higher requirements are put forward for the steering system of wheeled construction machinery. [0003] For example, sometimes the steering system is needed to enable the vehicle to have a smaller turning radius, such as Picture 1-1 As shown; sometimes the steering system is needed to enable the vehicle to complete parallel crab motion, such as Figure 1-2 As shown; even when the vehicle is drivin...

AI Technical Summary

Problems solved by technology

[0007] Both of the above two existing technologies can realize different steering functions according to actual needs, but there are corresponding defects due to the limitation of their own structural principles

[0008] Among them, using figure 2 For the multi-mode steering valve shown in , when the multi-mode steering valve is switched to the small turning and crab steering positions (that is, the valve body is in the second and fourth positions on the left), the steering hydraulic pressure of the front and rear groups The oil cylinder is a series structure. At this time, after the pressure provided by the hydraulic system pushes the front axle to steer, the remaining pressure can also push the rear axle to steer. This will make the pressure of the front steering oil cylinder too large and require high sealing performance. higher cost

[0009] Among them, using image 3 In the electro-hydraulic proportional multi-mode shown in , the accuracy, sensitivity and reliability of the wheel angle depend too much on the accuracy and reliability of the electrical components and hydraulic components. Once the electrical components (especially the encoder and controller) 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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