Hydraulic control system and method for wheeled construction machinery

Abstract

The invention relates to a hydraulic control system and a working method of a wheeled construction machine, comprising: a main oil circuit: the oil outlet of a variable variable pump is connected to the hydraulic cylinder of the working mechanism through a pressure compensator, and the oil outlet of the variable variable pump is connected to a compensation valve The oil inlet of the compensation valve is connected to the oil inlet of the steering gear, and the oil inlet of the variable pump is connected to the oil tank; the control oil circuit: including the priority valve, the spring end of the priority valve is connected to the Ls oil circuit, One end of the LS oil circuit is connected to the Ls port of the steering gear, the other end is connected to the oil inlet of the Ls relief valve, the oil outlet of the Ls relief valve is connected to the fuel tank, the non-spring end of the priority valve is connected to the oil inlet of the compensation valve connection, the oil inlet of the priority valve is connected with the oil inlet of the compensation valve, the oil outlet is connected with the spring end of the pressure compensator, and the oil outlet of the compensation valve is also connected with the Ls oil circuit, the hydraulic control system of the present invention is universal Well, reduced processing and maintenance costs.

Description

technical field [0001] The invention relates to the technical field of engineering machinery, in particular to a hydraulic control system and method for a wheeled engineering machinery. Background technique [0002] In the existing wheeled construction machinery, especially the wheel loader, higher requirements are put forward for the complex operation and low power consumption, which makes the combination of the LUDV hydraulic system with anti-flow saturation function and the hydraulic steering bypass priority valve The application will have a wide application space. The inventors found that if figure 1 As shown, in the current design of the bypass priority valve, the valve stems of the compensation valve 1 and the priority valve 2 are mostly controlled by the same spring. When the stiffness of the spring weakens during use, the performance of the bypass priority valve will be seriously affected. Using the same valve stem as the throttle valve, the valve core needs to be ...

AI Technical Summary

Problems solved by technology

The inventors found that if figure 1 As shown, in the current design of the bypass priority valve, the valve stems of the compensation valve 1 and the priority valve 2 are mostly controlled by the same spring. When the stiffness of the spring weakens during use, the performance of the bypass priority valve will be seriously affected. Using the same valve stem as the throttle valve, the valve core needs to be redesigned when matching different systems, which reduces its versatility and increases operation and maintenance costs; the inventor also found that the steering gear of wheeled construction machinery must have Ls Relief valve, due to the compact structure and limited space of the steering gear, the Ls relief valve increases its design and processing difficulty, failure rate and maintenance difficulty

[0003] The inventor also found that when the outside air temperature is low, the hydraulic oil in the connecting pipeline between the Ls overflow valve and the Ls port of the steering gear does not flow, the hydraulic oil is easily affected by temperature and becomes viscous, and the fluidity of the hydraulic oil changes. Poor, poor system responsiveness, affecting user experience

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