Compound action hydraulic control system and wheeled construction machinery applying same

Abstract

The invention discloses a compound action hydraulic control system. A liquid inlet pipeline of each operation loop is connected in parallel with a system pressure oil circuit. A hydraulic-control direction control valve is arranged between the system pressure oil circuit and a plurality of get-on operation circuits. A valve body of the hydraulic-control direction control valve is provided with four oil ports, wherein a first oil port is communicated with a second oil port; the first oil port is communicated with the system pressure oil circuit; the second oil port is communicated with the liquid inlet pipeline of a steering operation circuit; a third oil port is communicated with the liquid inlet pipelines of a plurality of get-on operation circuits; a fourth oil port is communicated witha working port of an executive component of the steering operation circuit; under the action of pressure oil of the fourth oil port, a valve core of the hydraulic-control direction control valve has the trend of displacement from a first working position to a second working position; when the valve core is positioned at the first working position, the first oil port is communicated with the thirdoil port; and the valve core is positioned at the second working position, the first oil port is not communicated with the third oil port. The invention also provides a wheeled construction machineryapplying the compound action hydraulic control system.

Description

technical field [0001] The invention relates to a wheeled construction machine, in particular to a composite action hydraulic control system and a wheeled construction machine using the system. Background technique [0002] In the prior art, various types of wheeled construction machinery have good self-propelled performance, and thus are widely used in different working environments. [0003] Each type of wheeled construction machinery completes corresponding functions through the actions of different executive components, such as: wheeled cranes, wheeled excavators, wheeled aerial work platforms, etc. As we all know, with the acceleration of the pace of social development, the requirements for various construction machinery are not limited to basic working performance such as safety and reliability. How to improve working efficiency has become the key point of optimal design; improve its operability. [0004] Taking the aerial work platform as an example, it has two type...

AI Technical Summary

Problems solved by technology

[0007] Obviously, for the combined action of steering action and boarding operation, the steering action of the existing hydraulic control system is limited by the boarding action, which cannot guarantee the priority execution of the vehicle's walking steering action, thus directly affecting the handling performance and Driving safety performance

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